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While theory supports bidirectional effects between caregiver sensitivity and language use, and infant language acquisition-both caregiver-to-infant and also infant-to-caregiver effects-empirical research has chiefly explored the former unidirectional path. In the context of infants showing early signs of autism, we investigated prospective bidirectional associations with 6-min free-play interaction samples collected for 103 caregivers and their infants (mean age 12-months; and followed up 6-months later). We anticipated that measures of caregiver sensitivity/language input and infant language would show within-domain temporal stability/continuity, but also that there would be predictive associations from earlier caregiver input to subsequent child language, and vice versa. Caregiver sensitive responsiveness (from the Manchester Assessment of Caregiver-Infant interaction [MACI]) predicted subsequent infant word tokens (i.e., amount of language, coded following the Systematic Analysis of Language Transcripts [SALT]). Further, earlier infant Mean Length of Utterance (MLU; reflecting language complexity, also derived from SALT coding) predicted later caregiver MLU, even when controlling for variability in infant ages and clear within-domain temporal stability/continuity in key measures (i.e., caregiver sensitive responsiveness and infant word tokens; and infant and caregiver MLU). These data add empirical support to theorization on how caregiver input can be both supportive of, and potentially influenced by, infant capacities, when infants have social-communication differences and/or communication/language delays suggestive of possible emerging autism.

Refereed/Peer-reviewed Natural Language Sampling (NLS) offers clear potential for communication and language assessment, where other data might be difficult to interpret. We leveraged existing primary data for 18-month-olds showing early signs of autism, to examine the reliability and concurrent construct validity of NLS-derived measures coded from video—of child language, parent linguistic input, and dyadic balance of communicative interaction—against standardised assessment scores. Using Systematic Analysis of Language Transcripts (SALT) software and coding conventions, masked coders achieved good-to-excellent inter-rater agreement across all measures. Associations across concurrent measures of analogous constructs suggested strong validity of NLS applied to 6-min video clips. NLS offers benefits of feasibility and adaptability for validly quantifying emerging skills, and potential for standardisation for clinical use and rigorous research design.

BACKGROUND: There is growing understanding of the potential benefits of a multi-method approach to accurately capture language skills of children on the autism spectrum. Tools such as Language ENvironment Analysis (LENA) provide an efficient means of capturing and analysing early child vocalizations (CVs) and the language learning environment. While developed to capture whole-day recordings of child language in naturalistic settings, there is potential utility in capturing, but little knowledge about, primary LENA metrics-including CVs and conversational turns (CTs)-and novel metrics, such as vocalization ratios (VRs), sampled in clinical practice settings where children are often seen. Moreover, recent research indicates that the novel VR may offer a broad indicator of children's developmental level, beyond just their language abilities, a hypothesis yet to be investigated in a large sample of children for whom the LENA was designed (i.e., pre-schoolers). AIMS: To explore the extent to which primary and novel LENA metrics collected during brief one-to-one clinical interaction was a useful indicator of developmental outcomes for children on the autism spectrum. METHODS & PROCEDURES: Participants were recruited as part of an on-going research programme evaluating early intervention outcomes (n = 99; age 14-47 months). Language samples were collected at intake (T1) using the wearable LENA Digital Language Processors during a one-to-one, play-based assessment with a clinician. Direct (Mullen Scales of Early Learning-MSEL) and parent-report (Vineland Adaptive Behavior Scales-VABS) measures of verbal and non-verbal skills were also collected at intake (T1) and again at exit (T2), approximately 12 months later. OUTCOMES & RESULTS: Few correlations were observed between child measures and CVs, a primary LENA metric. The novel VR metric was associated with concurrent direct assessment (MSEL) (and to a lesser extent parent report; VABS) measures of verbal and non-verbal skills, with moderate positive correlations found between VRs and all directly assessed subscale scores. However, VRs did not uniquely contribute to the prediction of child outcomes when baseline skills were also considered. CONCLUSIONS & IMPLICATIONS: The novel VR may provide an insight into autistic children's overall development in addition to their language ability, suggesting that even when collected in a short recording format, LENA might be a useful component of a multi-method assessment approach. WHAT THIS PAPER ADDS: What is already known on the subject To accurately capture language skills of children on the autism spectrum, multi-method approaches, including natural language sampling, are recommended. Tools such as LENA provide an efficient means of capturing and analysing naturalistic child language and the language learning environment. What this paper adds to existing knowledge This study demonstrates the potential benefits, and limitations, of using LENA to augment assessment of young children on the autism spectrum. Specifically, LENA provides a complementary, and low burden, method for capturing child language samples. What are the potential or actual clinical implications of this work? Novel metrics, such as the VR, collected during brief clinical interactions might be a useful component of a multi-method assessment approach for children on the autism spectrum.

Many autistic children have co-occurring behavioural problems influencing core autism symptomology potentially relevant for intervention planning. Parental Expressed Emotion – reflecting critical, hostile and overprotective comments – contributes to understanding and predicting behaviour in autistic school-aged children, adolescents and adults and is typically measured using the Five-Minute Speech Sample. However, limitations exist for its use with parents of younger autistic children and so the Autism-Specific Five-Minute Speech Sample was adapted with the goal of better measuring parent Expressed Emotion in the context of childhood autism. The Autism-Specific Five-Minute Speech Sample has not yet been used to explore Expressed Emotion in parents of autistic preschoolers, nor has the relative predictive utility of the Autism-Specific Five-Minute Speech Sample and Five-Minute Speech Sample been evaluated in the same sample. We compared the two measures from speech samples provided by 51 Australian parents with newly diagnosed autistic preschoolers, including investigating their predictive value for concurrent and subsequent child internalising and externalising behaviour problems. While Autism-Specific Five-Minute Speech Sample Expressed Emotion and Five-Minute Speech Sample Expressed Emotion were associated in this sample, only Autism-Specific Five-Minute Speech Sample codes contributed significant predictive value for concurrent and subsequent child problem behaviour. These preliminary data strengthen the position that the Autism-Specific Five-Minute Speech Sample may better capture Expressed Emotion, than the Five-Minute Speech Sample, among parents of autistic preschool-aged children. Lay abstract Parental Expressed Emotion refers to the intensity and nature of emotion shown when a parent talks about their child, and has been linked to child behaviour outcomes. Parental Expressed Emotion has typically been measured using the Five-Minute Speech Sample; however, the Autism-Specific Five-Minute Speech Sample was developed to better capture Expressed Emotion for parents of children on the autism spectrum. In each case, parents are asked to talk for 5 min about their child and how they get along with their child. Parents’ statements are then coded for features such as number of positive and critical comments, or statements reflecting strong emotional involvement. While both the Five-Minute Speech Sample and Autism-Specific Five-Minute Speech Sample have been used with parents of autistic school-aged children, their relative usefulness for measuring Expressed Emotion in parents of preschool-aged children – including their links to child behaviour problems in this group – is unclear. We collected speech samples from 51 parents of newly diagnosed autistic preschoolers to investigate similarities and differences in results from the Five-Minute Speech Sample and Autism-Specific Five-Minute Speech Sample coding schemes. This included exploring the extent to which the Five-Minute Speech Sample and Autism-Specific Five-Minute Speech Sample, separately, or together, predicted current and future child behaviour problems. While the two measures were related, we found only the Autism-Specific Five-Minute Speech Sample – but not the Five-Minute Speech Sample – was related to child behavioural challenges. This adds support to the suggestion that the Autism-Specific Five-Minute Speech Sample may be a more useful measure of parental Expressed Emotion in this group, and provides a first step towards understanding how autistic children might be better supported by targeting parental Expressed Emotion.

Background and aims: Although bilingualism is a common worldwide phenomenon, limited research has considered the experiences of children with autism growing up in bilingual environments. Here, we investigated the potential influence of parental bilingualism, and native vs. non-native language use, on responsiveness to children’s communication attempts during parent–child interactions where the child had autism. Specifically, we investigated the amount of parent responses to child verbal communication (frequency) and the promptness of these responses (temporal synchrony). Methods: Participants were 22 monolingual and 20 bilingual parents and their children with autism aged 2–6 years, recruited from a multicultural, metropolitan city where English is the dominant language. Extending from our previous report on this sample, we identified the frequency and temporal synchrony of parent responses from filmed 10-minute free-play sessions. Monolingual parents were videoed during one free-play session in English. Bilingual parents were videoed during two free-play sessions; one in their native language and one in English. We compared the frequency and temporal synchrony of parental responses across monolingual and bilingual parent groups and, for bilingual parents, across native vs. non-native (English) language interaction samples. Finally, we examined how other measures of bilingual parents’ non-native language proficiency were associated with interaction responsiveness measures. Results: When using their native language, bilingual parents demonstrated reduced frequency of responsiveness (even when controlling for opportunities provided by the child) and less temporal synchrony to child communication compared to English-speaking monolingual parents. Bilingual parents were also less frequently responsive (but not less temporally synchronous) during their native- compared to during their non-native (English) language interactions. Moreover, for bilingual parents, more frequent responsiveness to child communication bids when interacting in non-native English was associated with greater assessed English vocabulary knowledge. Conclusions: In this sample, use of non-native English did not appear to adversely affect how often, or how quickly, bilingual parents responded to their children’s verbal communication bids. However, nor did we find evidence of a native-language advantage. Rather, during English-language interactions, when these bilingual parents were responsive towards their children, this was on par with rates and timing of responsiveness shown by English-speaking monolinguals. This may partly be explained by bilinguals’ non-native language proficiency, and habitual use/personal dominance patterns. Implications: These data suggest no definitive drawback of non-native language use for synchronous responsiveness by bilingual parents interacting with young children with autism. However, our data also serve to highlight the complex, multifaceted nature of adult bilingualism, and indicate the need for more research – with large, well-characterised samples – to permit strong conclusions concerning how parental language-use choices may influence children’s natural learning environments, including in the context of autism and developmental language impairments.

Effective parent-teacher partnerships improve outcomes for autistic students. Yet, we know little about what effective partnerships look like for parents of autistic children from different backgrounds. We conducted interviews with 17 Chinese parents of autistic children attending Australian kindergartens/schools to understand their experiences. Parents appreciated the acceptance, opportunities and supports they received in Australia. They had high expectations of children; expectations not often shared by educators. Parents were respectful of teachers’ expertise and polite and undemanding in interactions. Nevertheless, parents were frustrated by inconsistent teaching quality and inadequate communication. Navigating systems was also challenging and parents faced discrimination from teachers and their community. Recommendations include fostering open home-school communication, proactively seeking parents’ expertise about children and explicitly scaffolding parents’ self-advocacy.

The Cape Darnley region in East Antarctica has been an area of scientific interest for a variety of disciplines over the last three decades. The recent acquisition of several high-resolution bathymetry datasets enabled the compilation of a detailed regional bathymetry grid. We present a high-resolution bathymetric compilation of the Cape Darnley region in East Antarctica, including areas of the Mac.Robertson Land shelf, slope and adjacent deep sea. A variety of data, single-beam and multibeam swath bathymetry and digitized depths from nautical charts were sourced from numerous institutions. The 100 m-resolution gridded bathymetric dataset improves previous bathymetric representations of the region and enables visualization of the seafloor morphology in unprecedented detail. The bathymetry grid has been constructed using a layered hierarchy approach based on the source of each dataset. This data compilation forms important baseline information for a range of scientific applications and end users including oceanographers, glacial modellers, biologists and geologists. The compilation will aid numerical modelling of ocean circulation, reconstruction of palaeo-ice streams and refinement of ice-sheet models.

Both the amount and responsiveness of adult language input contribute to the language development of autistic and non-autistic children. From parent–child interaction footage, we measured the amount of adult language input, overall parent responsiveness, and six discrete parent responsive behaviours (imitations, expansions, open-ended questions, yes/no questions, comments and acknowledgements) to explore which types of responsiveness predicted autistic preschoolers’ language five months later, after controlling for adult language input. We found expansions and particularly imitations to be more important for later language than overall responsiveness. This study emphasises the need to capture what exactly about parent language input influences child language acquisition, and adds to the evidence that imitating and expanding early language might be particularly beneficial for autistic preschoolers.

Specific features of adult linguistic input may play a larger, or smaller role, at different child ages, across different language outcomes, in different cohorts. This prospective, longitudinal stu...

Increasing social-communication skills and peer interaction are high priority intervention targets for parents of children with autism (McConachie et al., 2018), including for 5-year-old Jimmy feat...

Effective parent–teacher partnerships can improve outcomes for autistic students. Yet, we know little about what effective partnerships look like for parents of autistic children from diverse backgrounds. Using participatory methods, we conducted semi-structured interviews with 15 Somali mothers of autistic children attending Australian kindergartens/schools to understand experiences of parent–teacher interactions. We used reflexive thematic analysis to identify key themes. We found that mothers were proud and accepting of their children. They had high expectations, particularly around children’s independence. Mothers wished their children’s differences were understood and supported by other people, including teachers. They were frustrated by low expectations of children, a lack of genuine communication from teachers and limited autism-specific knowledge, skills and experience within schools. They described racist attitudes towards their children and reported that they themselves had experienced stigma. They also had few sources of support to rely upon, although their non-autistic daughters and their faith were important foundations for resilience. Despite all of these challenges, mothers themselves were increasing community awareness and knowledge about autism in the hope that they and their children would be valued by others. Our work has implications for how teachers and schools can foster successful relationships with Somali parents of autistic children. Lay abstract Good relationships between parents and schools can improve autistic children’s school success. There are many reasons why families from different cultural backgrounds find it harder to develop good relationships with schools, such as language barriers, discrimination and unfamiliarity with education systems. We know little about what ‘good relationships’ look like for these families. Here, we worked with a team of autistic and non-autistic researchers as well as an Advisory Group of Somali parents to conduct interviews with 15 Somali mothers of kindergarten and school-age autistic children. We asked mothers about their experiences of their child’s education, communication with teachers and what a good relationship with schools would look like. We also asked how they felt the Somali community understood autism. We looked for common things that mothers said. We found that mothers were very proud of their children. They had high expectations, particularly about what children could do by themselves. Mothers found it frustrating that teachers had low expectations, that schools were not good at communicating with them and that autism-specific skills and experience were uncommon in schools. They also reported racist attitudes towards their children. Mothers experienced stigma and lacked resources, but support was gained from their daughters and their religion. Mothers themselves were proactively increasing community awareness and knowledge about autism in the hope that they and their autistic children would be valued and better supported. Our work has implications for how teachers and schools can work together with Somali parents to forge better futures for autistic children.

Key Points Question Does preemptive intervention compared with usual care reduce the severity of autism symptoms and the likelihood of an autism spectrum disorder (ASD) diagnosis in infants showing early signs of ASD? Findings In this randomized clinical trial of 103 infants showing early behavioral signs of ASD, preemptive intervention led to a statistically significant reduction in the severity of ASD behaviors across early childhood. Infants who received the preemptive intervention had lower odds of meeting diagnostic criteria for ASD (7%) than those who received usual care (21%) at age 3 years, with a number needed to treat of 7 participants. Meaning This study found that a preemptive intervention reduced ASD diagnostic behaviors when used at the time atypical development first emerges during infancy., Importance Intervention for individuals with autism spectrum disorder (ASD) typically commences after diagnosis. No trial of an intervention administered to infants before diagnosis has shown an effect on diagnostic outcomes to date. Objective To determine the efficacy of a preemptive intervention for ASD beginning during the prodromal period. Design, Setting, and Participants This 2-site, single rater–blinded randomized clinical trial of a preemptive intervention vs usual care was conducted at 2 Australian research centers (Perth, Melbourne). Community sampling was used to recruit 104 infants aged 9 to 14 months showing early behaviors associated with later ASD, as measured by the Social Attention and Communication Surveillance–Revised. Recruitment occurred from June 9, 2016, to March 30, 2018. Final follow-up data were collected on April 15, 2020. Interventions Infants were randomized on a 1:1 ratio to receive either a preemptive intervention plus usual care or usual care only over a 5-month period. The preemptive intervention group received a 10-session social communication intervention, iBASIS–Video Interaction to Promote Positive Parenting (iBASIS-VIPP). Usual care comprised services delivered by community clinicians. Main Outcomes and Measures Infants were assessed at baseline (approximate age, 12 months), treatment end point (approximate age, 18 months), age 2 years, and age 3 years. Primary outcome was the combined blinded measure of ASD behavior severity (the Autism Observation Scale for Infants and the Autism Diagnostic Observation Schedule, second edition) across the 4 assessment points. Secondary outcomes were an independent blinded clinical ASD diagnosis at age 3 years and measures of child development. Analyses were preregistered and comprised 1-tailed tests with an α level of .05. Results Of 171 infants assessed for eligibility, 104 were randomized; 50 infants (mean [SD] chronological age, 12.40 [1.93] months; 38 boys [76.0%]) received the iBASIS-VIPP preemptive intervention plus usual care (1 infant was excluded after randomization), and 53 infants (mean [SD] age, 12.38 [2.02] months; 32 boys [60.4%]) received usual care only. A total of 89 participants (45 in the iBASIS-VIPP group and 44 in the usual care group) were reassessed at age 3 years. The iBASIS-VIPP intervention led to a reduction in ASD symptom severity (area between curves, −5.53; 95% CI, −∞ to −0.28; P = .04). Reduced odds of ASD classification at age 3 years was found in the iBASIS-VIPP group (3 of 45 participants [6.7%]) vs the usual care group (9 of 44 participants [20.5%]; odds ratio, 0.18; 95% CI, 0-0.68; P = .02). Number needed to treat to reduce ASD classification was 7.2 participants. Improvements in caregiver responsiveness and language outcomes were also observed in the iBASIS-VIPP group. Conclusions and Relevance Receipt of a preemptive intervention for ASD from age 9 months among a sample of infants showing early signs of ASD led to reduced ASD symptom severity across early childhood and reduced the odds of an ASD diagnosis at age 3 years. Trial Registration http://anzctr.org.au identifier: ACTRN12616000819426., This randomized clinical trial examines whether preemptive intervention compared with usual care reduces the severity of autism symptoms and the odds of an autism spectrum disorder diagnosis among infants showing early signs of autism.

Parents from individualist cultures (those focused on autonomy of individuals; that is, Australian) may view their autistic children differently compared to parents from collectivist cultures (where community needs are valued over an individual’s, that is, South-East Asian cultures). As most research on autism and parenting has been undertaken in Western individualist cultures, knowledge of parenting beliefs and mental health within collectivist cultures is lacking. We compared the mental health, quality of life, well-being and parenting sense of competency between families raising an autistic child from two groups: 97 Australian parents and 58 parents from South-East Asian backgrounds. Children from both groups were receiving the same community-based early intervention. No group differences were found on the measures of mental health but, when compared to Australian parents, parents from South-East Asian backgrounds reported higher well-being and less impact on their quality of life resulting from their child’s autism-specific difficulties. Furthermore, a positive association between well-being and quality of life was only observed for South-East Asian parents. Hence, the views of, and responses to, disability for South-East Asian parents may act as a protective factor promoting well-being. This novel research indicates that culture plays a role in parenting autistic children and highlights the need to accurately capture cultural background information in research. Lay abstract We know that parents of autistic children experience poorer mental health and lower well-being than parents of non-autistic children. We also know that poorer mental health among parents of autistic children has been observed across different cultures. Most research focuses on Western cultures, so we know little about parental mental health and well-being of parents from different cultural backgrounds; yet, it is likely that cultural background contributes to how parents view their child’s condition and respond to the diagnosis. Here, we compared mental health, quality of life and well-being between families raising an autistic child from Australian backgrounds to families from South-East Asian backgrounds. All children in the current study were receiving the same community-based early intervention. When compared to the general population, parents had poorer mental health overall, but there were no differences between the two groups of parents. However, parents from South-East Asian backgrounds reported higher well-being and fewer difficulties associated with their child’s autism. These findings suggest that cultural background likely influences not only parent’s view of, and response to, their child’s autism, but also their own sense of well-being. As researchers and clinicians working with families of autistic children, we should more explicitly consider family’s cultural background within our work.

Understanding past retreat of Antarctic ice margins provides valuable insight for predicting how ice sheets may respond to future environmental change. This study, based on high resolution multibeam bathymetry from the nearshore region of the Windmill Islands, East Antarctica, reveals a style of retreat that has been rarely observed on the Antarctic margin. A suite of seafloor features record the final retreat stages of a relatively thin, and increasingly fractured tidewater glacier confined within narrow troughs and embayments, forming a suite of features more typical of warm-based ice, but occurring here in a region of cold-based ice with limited surface meltwater production. The pattern of moraines and crevasse squeeze ridges, reveals strong topographic and substrate control on the nature of ice sheet retreat. Topographic control is indicated by fine-scale variability in the orientation and distribution of glacial landforms, which show that the seabed topography influenced the shape of the ice margin, caused deflection of ice flow and led to the separation of flow downstream from topographic highs. The availability of water saturated marine sediments within the troughs and depressions also had a profound effect on the landform record, facilitating the construction of moraines and crevasse squeeze ridges within topographic lows, corresponding to areas of modern sediment accumulation. Surrounding areas of crystalline bedrock, by contrast, acted as sticky spots and lack a well-developed landform record. This seafloor glacial record emphasises the importance of understanding the bed topography and substrate when predicting the nature of ice margin retreat and provides new perspectives for understanding the stability of the East Antarctic margin.

Extensive research has shown elevated mental health difficulties among parents of children with autism compared to other parents. Although several studies have explored factors related to mental health among parents of children with autism, the factors that influence and promote well-being remain poorly characterised. Parents of young, newly diagnosed autistic children may also be particularly vulnerable to stressors that impact mental health and well-being. We examined child-, parent-, and family/socioeconomic factors associated with concurrent mental health and well-being among 136 parents of young children with autism, aged 13–48 months. Parental mental health was predicted by both trait negative emotionality and reported child autism symptoms, while well-being was predicted by parent factors alone, including trait extraversion and mindfulness. Broader child characteristics and family/socioeconomic contextual factors made no significant contribution in regression models. While the mental health and well-being of parents with young autistic children are associated with one another, unique predictors seem to exist. That well-being was uniquely predicted by a modifiable parent characteristic – mindfulness – suggests the potential for early supports to bring direct benefits for parents, in the context of raising a young child with autism. Lay abstract Raising a child with autism has been linked to mental health difficulties. Poor parental mental health is likely influenced by various factors – including child-, parent-, and family/socioeconomic characteristics. However, little is known about what influences and promotes well-being (as opposed to mental health) among parents of young, newly diagnosed autistic children who may be particularly vulnerable. We examined child-, parent-, and family/socioeconomic factors associated with each of mental health and well-being in a sample of 136 parents of pre-school-aged children. Parental mental health was linked to both child- (i.e. autism symptom severity) and parent-related factors (i.e. personality traits reflecting a tendency to experience negative emotions). By contrast, in additional to mental health difficulties, which were linked to well-being, only other parent-related characteristics (and not child characteristics) were related to well-being. These included personality traits reflecting a tendency to be more extraverted/sociable, and also mindfulness. Other child-related and family/socioeconomic context factors (including household income, parental education level) were not linked to parental mental health or well-being in this sample. These results support the idea that poorer mental health and well-being are not simply the opposite of one another. That is, while these two factors were related, they were linked to different personal characteristics. Perhaps most importantly, the link between well-being and mindfulness – a personal characteristic that parents can improve – suggests mindfulness-based interventions may be helpful in directly supporting parental well-being in the context of raising a young child with autism.

BACKGROUND: Early reading success is predicated on language and pre-literacy skills. Children who are behind their peers in language and pre-literacy development before formal schooling are less likely to be proficient beginner readers, and difficulties may persist throughout primary school and beyond. We know children experiencing adversity are at greater risk of early language and pre-literacy difficulties; we do not know the prevalence of these difficulties in an Australian adversity context. AIMS: To investigate the prevalence and co-occurrence of language and pre-literacy difficulties in a cohort of Australian 5-year-old children experiencing social adversity. METHODS & PROCEDURES: Data were drawn from a large Australian community-based trial of nurse home visiting (right@home), which aimed to support women experiencing social adversity from pregnancy until their child turned 2 years of age. Social adversity was determined by two of more risk factors: young pregnancy, not living with another adult, no support, poorer health, current smoker, long-term illness, anxious mood, not finishing high school, no household income and no previous employment. Children whose mothers were enrolled in the control group (receiving usual maternal and child healthcare) were included in the current study (n = 359). Language and pre-literacy skills were measured at age 5 using the Clinical Evaluation of Language Fundamental Preschool-Second Edition (CELF-P2) and the School Entry Alphabetic and Phonological Awareness Readiness Test (SEAPART). Language difficulties were defined as ≥ 1.25 standard deviations (SD) below the Australian normative mean on CELF-P2 Core Language scores. Pre-literacy difficulties were defined as children scoring in the Beginner (versus Developing or Competent) criterion-referenced level on the SEAPART First Sound Identification and/or Alphabet Letter Identification subtests. Co-occurrence of language and pre-literacy difficulties was also determined. OUTCOMES & RESULTS: At the 5-year follow-up, 201/359 (56%) children were assessed (mean age = 5.1 years, SD = 0.1). Mean Core Language score for this cohort (91.8, SD = 15.9) was 0.54 SD below the normative mean (100, SD = 15). The proportion of children presenting with language difficulties was 24.9%. Regarding pre-literacy skills, 43.8% of children were 'Beginner' for identifying first sounds and 58.6% for identifying alphabet letters/sounds. There was also considerable overlap whereby 76.7% of children with language difficulties also exhibited pre-literacy difficulties. CONCLUSIONS & IMPLICATIONS: This is the first empirical Australian-based study highlighting the high prevalence and co-occurrence of language and pre-literacy difficulties in preschool children experiencing social adversity. Clinicians should be aware of co-morbid language and pre-literacy difficulties in disadvantaged populations and consider both areas during assessment and intervention planning. What this paper adds What is already known on the subject The prevalence of language and literacy difficulties is substantially higher in cohorts experiencing social adversity when compared with more advantaged families. There is some evidence that adversity also contributes to pre-literacy difficulties, but less is known here. What this paper adds to existing knowledge This study presents new prevalence data showing high rates of language and pre-literacy difficulties for 5-year-old children experiencing adversity within an Australian context. It is the first to explore these skills in a large cohort of pre-schoolers recruited from community settings in Australia. What are the potential or actual clinical implications of this work? In this cohort experiencing adversity, most children who presented with language difficulties likewise exhibited pre-literacy difficulties. This concordance reflects how early oral language and pre-literacy skills develop together. Clinicians should assess both skills in preschool populations-especially those working with children experiencing adversity-to ensure all children have strong foundations to become proficient beginner readers.

Understanding the vulnerability of marine calcifiers to ocean acidification is a critical issue, especially in the Southern Ocean (SO), which is likely to be the one of the first, and most severely affected regions. Since the industrial revolution, ~30% of anthropogenic CO2 has been absorbed by the oceans. Seawater pH levels have already decreased by 0.1 and are predicted to decline by ~ 0.3 by the year 2100. This process, known as ocean acidification (OA), is shallowing the saturation horizon, which is the depth below which calcium carbonate (CaCO3) dissolves, likely increasing the vulnerability of many marine calcifiers to dissolution. The negative impact of OA may be seen first in species depositing more soluble CaCO3 mineral phases such as aragonite and high-Mg calcite (HMC). These negative effects may become even exacerbated by increasing sea temperatures. Here we combine a review and a quantitative meta-analysis to provide an overview of the current state of knowledge about skeletal mineralogy of major taxonomic groups of SO marine calcifiers and to make predictions about how OA might affect different taxa. We consider their geographic range, skeletal mineralogy, biological traits and potential strategies to overcome OA. The meta-analysis of studies investigating the effects of the OA on a range of biological responses such as shell state, development and growth rate shows response variation depending on mineralogical composition. Species-specific responses due to mineralogical composition suggest taxa with calcitic, aragonitic and HMC skeletons may be more vulnerable to the expected carbonate chemistry alterations, and low magnesium calcite (LMC) species may be mostly resilient. Environmental and biological control on the calcification process and/or Mg content in calcite, biological traits and physiological processes are also expected to influence species specific responses.

We report on frequency doubling of high-energy, high-repetition-rate ns pulses from a cryogenically gas cooled, multi-slab Yb:YAG laser system, using a type-I phase–matched lithium triborate (LBO) crystal. Pulse energy of 4.3 J was extracted at 515 nm for a fundamental input of 5.4 J at 10 Hz (54 W), corresponding to a conversion efficiency of 77%. However, during long-term operation, a significant reduction of efficiency (more than 25%) was observed owing to the phase mismatch arising due to the temperature-dependent refractive index change in the crystal. This forced frequent angle tuning of the crystal to recover the second-harmonic generation (SHG) energy. More than a five-fold improvement in energy stability of SHG was observed when the LBO crystal was mounted in an oven, and its temperature was controlled at 27°C. Stable frequency doubling with 0.8% rms energy variation was achieved at a higher input power of 74 W when the LBO temperature was controlled at 50°C.

We report on the successful demonstration of a 150 J nanosecond pulsed cryogenic gas cooled, diode-pumped multi-slab Yb:YAG laser operating at 1 Hz. To the best of our knowledge, this is the highest energy ever recorded for a diode-pumped laser system.

Shelf-incising canyons on the upper continental slope are important conduits for the export of dense, organic-rich shelf waters from the East Antarctic margin. This interaction of geomorphic features and oceanography plays an important role in controlling benthic community composition in this environment. Dense hydrocoral–sponge communities have been identified at new sites within a shelf-incising canyon on the upper continental slope (430–640 m) off George V Land, East Antarctica, adjacent to sites previously identified and declared Vulnerable Marine Ecosystems by the Commission for the Conservation of Antarctic Marine Living Resources. Sparse hydrocoral communities were also found at several sites along the continental slope receiving dense shelf waters. These findings provide further evidence of hydrocoral communities along the George V Land slope and support previous hypotheses regarding the importance of Antarctic Bottom Water export from the shelf providing an abundant food source for the benthos within shelf-incising canyons.

Background Parent-reported measures of early communication have limitations for use with infants experiencing adversity. Observational measures of early non-verbal and verbal communicative behaviours and mother-child turn-taking may provide a complementary method of capturing early communication skills for these children. Aims To explore the predictive validity of verbal and non-verbal behaviours and mother-child conversational turn-taking (fluency and connectedness) at child age 12 months in relation to language measures at 24 and 36 months in a cohort of infants experiencing adversity. Methods & procedures Pregnant women experiencing adversity were recruited from maternity hospitals in Australia. At 12 months, 190 infants were videoed during mother-child free-play. Verbal and non-verbal communicative behaviours and fluency and connectedness were measured from the 12-month videos. Predictive validity of 12-month behaviours was calculated in relation to mean length of utterance and number of unique words at 24 months and Clinical Evaluation of Language Fundamentals Preschool-Second Edition (CELF-P2) Core Language scores at 36 months. Outcomes & results All 12-month behaviours had adequate specificity but poor sensitivity when compared with other predictive validity studies using published early language measures. However, in adjusted regression models, fluency and connectedness and verbal behaviours at 12 months predicted unique words at 24 months. Fluency and connectedness also predicted CELF-P2 scores at 36 months. Conclusions & implications Findings reconfirm the difficulty in early identification of children at risk of later language difficulties. All 12-month measures were more accurate at identifying those children who will have better language than those children who will not. As fluency and connectedness was the only measure to predict 24- and 36-month language in adjusted regression models, it may be an important factor to consider when measuring early language skills for infants experiencing adversity. Future research could combine observational measures of early communication and fluency and connectedness with other predictors of language to try to increase prediction accuracy.

We explored whether supported (SJE) or coordinated joint engagement (CJE) between mothers recruited from the community and their 24-month-old children who were slow-to-talk at 18 months old were associated with child language scores at ages 24, 36, and 48 months (n = 197). We further explored whether SJE or CJE modified the concurrent positive associations between maternal responsive behaviours and language scores. Previous research has shown that SJE, maternal expansions, imitations, and responsive questions were associated with better language scores. Our main finding was that SJE but not CJE was consistently positively associated with 24- and 36-month-old expressive and receptive language scores, but not with 48-month-old language scores. SJE modified how expansions and imitations, but not responsive questions, were associated with language scores; the associations were evident in all but the highest levels of SJE. Further research is necessary to test these findings in other samples before clinical recommendations can be made.

Background Identifying risk and protective factors for language development informs interventions for children with developmental language disorder (DLD). Maternal responsive and intrusive communicative behaviours are associated with language development. Mother-child interaction quality may influence how children use these behaviours in language learning. Aims To identify (1) communicative behaviours and interaction quality associated with language outcomes; (2) whether the association between a maternal intrusive behaviour (directive) and child language scores changed alongside a maternal responsive behaviour (expansion); and (3) whether interaction quality modified these associations. Methods & procedures Language skills were assessed at 24, 36 and 48 months in 197 community-recruited children who were slow to talk at 18 months. Mothers and 24-month-olds were video-recorded playing at home. Maternal praise, missed opportunities, and successful and unsuccessful directives (i.e., whether followed by the child) were coded during a 10-min segment. Interaction quality was rated using a seven-point fluency and connectedness (FC) scale, during a 5-min segment. Linear regressions examined associations between these behaviours/rating and language scores. Interaction analysis and simple slopes explored effect modification by FC. Outcomes & results There was no evidence that missed opportunities or praise were associated with language scores. Higher rates of successful directives in the unadjusted model and unsuccessful directives in the adjusted model were associated with lower 24-month-old receptive language scores (e.g., unsuccessful directives effect size (ES) = -0.41). The association between unsuccessful directives and receptive language was weaker when adjusting for co-occurring expansions (ES = -0.34). Both types of directives were associated with poorer receptive and expressive language scores in adjusted models at 36 and 48 months (e.g., unsuccessful directive and 48-month receptive language, ES = -0.66). FC was positively associated with 24-, 36- and 48-month language scores in adjusted models (e.g., receptive language at 24 months, ES = 0.21, at 48 months, ES = 0.18). Interaction analysis showed the negative association between successful directives and 24-month receptive language existed primarily in poorly connected dyads with low FC levels. Conclusions & implications These findings illustrate the effects of the combined interaction between different maternal communicative behaviours and features of the interaction itself on child language development, and the need to consider both in research and practice. Whilst more intrusive directives were associated with poorer language scores, this association attenuated when adjusting for co-occurring responsive expansions, and the association was strongest for children in lower quality interactions. This work may inform clinical practice by helping clinicians target the most appropriate communicative behaviours for specific mother-child dyads.

A high-resolution multibeam sonar dataset covering an area of ca. 33 km 2 was collected in the vicinity of the Windmill Islands (67°S, 110°E), Wilkes Land, East Antarctica. The new data permit visualisation of the nearshore seafloor morphology in unprecedented detail, providing invaluable insight into the ice-sheet history of the region. A range of geomorphic features are evident, including prominent parallel northwest-trending linear fault sets affecting Mesoproterozoic metamorphic basement, which appear to control the regional coastal physiography. The fault systems probably formed during fragmentation of eastern Gondwana during the Mesozoic. Networks of sub-glacial meltwater channels, preserved on bedrock platforms and ridges, indicate grounding of a thick ice sheet over the continental shelf during previous glaciations. West-trending subtle glacial lineations and streamlined landforms record evidence of the westward expansion of the grounded Law Dome ice sheet margin, probably during the late Pleistocene. The direction of these features coincides with glacial striae on onshore crystalline bedrock outcrops. Perhaps the most striking glacial geomorphological features are sets of arcuate ridges confined mostly within glacially excavated U-shaped troughs formed by erosion of the northwest-trending bedrock fault sets. These ridge sets are interpreted as push moraines or grounding zone features, formed during episodic retreat of highly channelised, topographically-controlled ice-streams following ice surging of the Law Dome margin. This event was possibly triggered in response to local environmental forcing during the mid-late Holocene. Minor post-glacial marine sedimentation is preserved in several small (≤ 1 km 2 ) isolated basins with shallow seaward sills.

Variations in parenting have been suggested as contributing to a higher prevalence of language difficulties in children experiencing economic, environmental, and social adversity. Within these cohorts, the contribution of responsive and intrusive parenting to child language has been investigated; specific responsive and intrusive behaviors encapsulated within these parenting styles have yet to be fully examined. Additionally, the role of the mother–child dynamic in moderating mother–child associations has also not been explored. This study aimed to augment current research by identifying specific responsive and intrusive maternal behaviors associated with child language in a cohort experiencing adversity, as well as exploring the role of the fluency and connectedness of mother–child conversation in moderating associations (n = 249). Specific behaviors and the fluency and connectedness of the mother–child interaction were coded from free-play videos at child age 12 months. Child language measures were derived from transcripts of free play at 24 months. Linear regression models were used to examine maternal–child associations. The moderating role of fluency and connectedness was then explored. Maternal imitations were positively associated with the child's total words; successful redirectives were negatively associated with the child's mean length of turn. Both associations were moderated by the fluency and connectedness of the interaction.

Evidence suggests that children living in adversity are at greater risk of poorer language than their peers with the quality of parental interactions potentially mediating this association. Studies typically measure the mediatory impact of generic interaction styles making it difficult to discern which particular aspects of the interaction are facilitating language. This study aims to bridge this gap by identifying specific maternal behaviours associated with concurrent infant communication, in a cohort of 12-month old infants and their mothers experiencing adversity.A total of 249 mother-infant free-play videos were collected from women experiencing adversity in Victoria and Tasmania, Australia. From those videos, specific maternal behaviours, infant communication acts and the interaction quality were coded.Maternal verbal imitations uniquely predicted concurrent use of infant vocalisations, total words and unique words. Furthermore, the more fluent and connected the mother-infant dyad, the stronger the association between imitations and all three infant measures.Frequent use of maternal imitations, within highly connected mother-infant dyads, may help mediate the impact of adversity on early communication. This information is important for early years professionals working with at-risk populations in augmenting current knowledge of risk and protective factors related to early language.

AIM To compare language, speech, and voice of children born preterm and at term, and determine relevant predictors of outcome. METHOD Three hundred infants (150 males, 150 females; 149 born at

Acoustic signals recorded from laser shock peening (LSP) of aluminium, titanium and stainless steel alloys were analysed for different laser pulse widths, energy and confinement conditions. In this paper, we report that different materials and conditions registered unique acoustic signatures. Further, the acoustic signatures in the time domain were transformed to the frequency domain and were fitted to a lognormal distribution, yielding a unique set of parameters for each material and set of conditions. These parameters were benchmarked using the measurements of residual stress by the incremental centre hole-drilling (ICHD) method. Detailed analysis of the acoustic signal reveals that this method once calibrated with few ICHD data, can identify successful peening of materials.

Efficient frequency conversion of high energy, high repetition rate 1 µm laser radiation suitable for pumping OPCPA systems and Ti:Sapphire lasers is crucial for the production of ultra-short, high peak power pulses at high repetition rate. Applications include advanced imaging, novel medical treatments and applied and fundamental science. Two 100 J / 10 Hz nanosecond pulsed Yb:YAG lasers, based on “DiPOLE” cryogenic gas-cooled amplifier technology developed at the Central Laser Facility (CLF) [1], have been built. The first DiPOLE100 laser is installed at the HiLASE facility in 2017 [2]. The second is being commissioned at the CLF and will be delivered to the European X-ray Free Electron Laser (XFEL) facility in Germany as a UK funded contribution-in-kind for installation on the High Energy Density (HED) instrument. This system will achieve its full 1 kW design output at the end of 2018, and will deliver high repetition rate 10 GW pulses and frequency converted for to a wide ranging user programme of high-energy density matter experiments (HED). In this paper, we present results of second and third harmonic generation (SHG and THG) experiments using the CLF’s 10 J, 10 Hz DiPOLE laser to pump an LBO crystal. A SHG conversion efficiency of > 75% was achieved in a xx mm LBO crystal for a 1030 nm pulse energy of 8 J and duration 10 ns operating at 10 Hz , corresponding to 4.2 J (5.4 J at the fundamental) J pulses at 515 nm. Furthermore, we have achieved > 40% conversion to the third harmonic in a 6 mm thick LBO crystal, corresponding to 3 J (7 J at the fundamental) at 343 nm, with a 2 ns temporal pulse width. Finally, we compare the SHG performance of LBO and YCOB crystals [3]. We present setup of the 10 J and 100 J conversation at HiLASE and show preliminary results. We will also present initial results of the commissioning of D100-X of the second amplifier and frequency conversion, which will be deployed on both DiPOLE100 systems, where it will be used for damage testing of optics and laser shock peening at HiLASE [4,5], and dynamic shock compression experiments at XFEL [6]. These results will be compared to our calculations on the efficiency of SHG and THG for a number of different temporal pulse shapes and durations. Efficient frequency conversion of high energy, high repetition rate 1 µm laser radiation suitable for pumping OPCPA systems and Ti:Sapphire lasers is crucial for the production of ultra-short, high peak power pulses at high repetition rate. Applications include advanced imaging, novel medical treatments and applied and fundamental science. Two 100 J / 10 Hz nanosecond pulsed Yb:YAG lasers, based on “DiPOLE” cryogenic gas-cooled amplifier technology developed at the Central Laser Facility (CLF) [1], have been built. The first DiPOLE100 laser is installed at the HiLASE facility in 2017 [2]. The second is being commissioned at the CLF and will be delivered to the European X-ray Free Electron Laser (XFEL) facility in Germany as a UK funded contribution-in-kind for installation on the High Energy Density (HED) instrument. This system will achieve its full 1 kW design output at the end of 2018, and will deliver high repetition rate 10 GW pulses and frequency converted for to a wide ranging user programme of high-energy density matter experiments (HED). In this paper, we present results of second and third harmonic generation (SHG and THG) experiments using the CLF’s 10 J, 10 Hz DiPOLE laser to pump an LBO crystal. A SHG conversion efficiency of > 75% was achieved in a xx mm LBO crystal for a 1030 nm pulse energy of 8 J and duration 10 ns operating at 10 Hz , corresponding to 4.2 J (5.4 J at the fundamental) J pulses at 515 nm. Furthermore, we have achieved > 40% conversion to the third harmonic in a 6 mm thick LBO crystal, corresponding to 3 J (7 J at the fundamental) at 343 nm, with a 2 ns temporal pulse width. Finally, we compare the SHG performance of LBO and YCOB crystals [3]. We present setup of the 10 J and 100 J conversation at HiLASE and show preliminary results. We will also present initial results of the commissioning of D100-X of the second amplifier and frequency conversion, which will be deployed on both DiPOLE100 systems, where it will be used for damage testing of optics and laser shock peening at HiLASE [4,5], and dynamic shock compression experiments at XFEL [6]. These results will be compared to our calculations on the efficiency of SHG and THG for a number of different temporal pulse shapes and durations. 1. S. Banerjee et al,"100 J-level nanosecond pulsed diode pumped solid state laser," Opt. Lett. 41, 2089-2092 (2016). 2. P. Mason et al, "Kilowatt average power 100 J-level diode pumped solid state laser," Optica 4, 438-439 (2017). 3. P. J. Phillips et al, ’High energy, high repetition rate, second harmonic generation in large aperture DKDP, YCOB and LBO crystals.’ Optics Express 24(17), 19682-19694 (2016). 4. J. Nygaard, ‘Laser shock peening using DiPOLE laser system’, The AILU Laser User Magazine Issue 86, Autumn 2017. 5. The authors gratefully acknowledge funding for this work from H2020 Widespread Teaming action and the Czech Ministry of Science. 6. M. McMahon at al, ”Conceptual Design report- Dynamic Laser Compression Experiments at HED Instruments of European XFEL, “ XFEL.EU TR-2017-001, February, 2017

The development at STFC’s Central Laser Facility (CLF) of multi-slab gas cooled amplifier technology based on ceramic Yb:YAG, known as DiPOLE, is well known within the field [1]. Previous successes using this laser architecture include a 10 J, 10 Hz prototype system and demonstration of the world’s first 100 J, 10 Hz, 10 ns system (DiPOLE100), supplied to and commissioned at the HiLASE facility[2]. The success of the first kW-class 100 J nanosecond pulsed laser led to development of a second system to be made available to users of the HED Instrument at the European XFEL in collaboration with HiBEF / HZDR. This system, DiPOLE-100X, will be used for fundamental research into the structure and compression of materials, such as present in extrasolar planets [3]. DIPOLE-100X will provide nanosecond, user defined, temporally shaped pulses that once frequency doubled and focussed on target, create the pressure and temperature states of matter relevant to exoplanetary interiors. These changes can then be probed using the bright x-ray pulses of the European XFEL. DIPOLE-100X is scheduled for completion at the end of summer, before shipment to the European XFEL later in the year. In this paper we will present the operational and commissioning results for DiPOLE-100X, highlighting design changes and upgrades over the first generation, along with future developments of DiPOLE technology at the CLF.

We report on the experimental characterization of the temperature dependence of theoptical rotatory power of crystalline quartz at 1030 nm wavelength between 77 K and 325 K.

We report on the successful demonstration of second and third harmonic conversion of a high pulse energy, high average power 1030 nm diode pumped Yb-doped yttrium aluminum garnet (Yb:YAG) nanosecond pulsed laser in a large aperture lithium triborate (LBO) crystal. We demonstrated generation of 59.7 J at 10 Hz (597 W) at 515 nm (second harmonic) and of 65.0 J at 1 Hz (65 W) at 343 nm (third harmonic), with efficiencies of 66% and 68%, respectively. These results, to the best of our knowledge, represent the highest energy and power reported for frequency conversion to green and UV-A wavelengths.

In this paper, we present a model to predict thermal stress-induced birefringence in high energy, high repetition rate diode-pumped Yb:YAG lasers. The model calculates thermal depolarisation as a function of gain medium geometry, pump power, cooling parameters, and input polarisation state. We show that model predictions are in good agreement with experimental observations carried out on a DiPOLE 100 J, 10 Hz laser amplifier. We show that single-pass depolarisation strongly depends on input polarisation state and pumping parameters. In the absence of any depolarisation compensation scheme, depolarisation varies over a range between 5% and 40%. The strong dependence of thermal stress-induced depolarisation on input polarisation indicates that, in the case of multipass amplifiers, the use of waveplates after every pass can reduce depolarisation losses significantly. We expect that this study will assist in the design and optimisation of Yb:YAG lasers.

The HiLASE “Bivoj” laser system developed at CLF Rutherford Appleton Laboratory in collaboration with HiLASE team as DiPOLE100 was relocated to Dolni Brezany near Prague, Czechia at the end of 2015 and fully re-commissioned at the end of 2016. In 2016, the system demonstrated average output power of 1kW generating pulses of 105 J at 10 Hz repetition rate for the first time in the world. Since then the system has been subjected to several testing campaigns in order to determine some of its key characteristics. Beam quality, wavefront quality, pointing stability, energy stability and experience with long term operation of 1 kW laser are presented. In addition, depolarization effects have been detected inside the main amplifier. Details on these results along with numerical simulations are presented.

BACKGROUND: Variations in parenting, more specifically less responsive and more directive parenting, contribute to language difficulties for children experiencing adversity. Further investigation of associations between specific responsive and directive behaviours and child language is required to understand how behaviours shape language over time within different populations. As language is dyadic, further exploration of how mother-child interactions moderate associations is also important. AIMS: To investigate associations between specific responsive and directive maternal behaviours, the quality of mother-child interaction (fluency and connectedness) and child language in a cohort experiencing adversity. METHODS & PROCEDURES: Pregnant women experiencing adversity were recruited from maternity hospitals in Australia. At 12 months, videos of mother-infant free play were collected. Videos were coded for maternal behaviours and fluency and connectedness (n = 249). At 36 months, child language was measured using a standardized language test. Linear regression models were used to examine associations and the moderating role of fluency and connectedness was explored. OUTCOMES & RESULTS: Responsive yes/no questions were positively associated with language scores. Unsuccessful redirectives were negatively associated with language scores. The moderation effect of fluency and connectedness was equivocal in the current data. CONCLUSIONS & IMPLICATIONS: Findings reproduce and extend previous research highlighting key features of mother-child interactions associated with child language trajectories. Findings also augment knowledge of risk and protective factors related to language for children experiencing adversity and highlight where targeted interventions might be successful.

Parent-reported measures of early communication have limitations for use with infants experiencing adversity. Observational measures of early non-verbal and verbal communicative behaviours and mother-child turn-taking may provide a complementary method of capturing early communication skills for these children.To explore the predictive validity of verbal and non-verbal behaviours and mother-child conversational turn-taking (fluency and connectedness) at child age 12 months in relation to language measures at 24 and 36 months in a cohort of infants experiencing adversity.Pregnant women experiencing adversity were recruited from maternity hospitals in Australia. At 12 months, 190 infants were videoed during mother-child free-play. Verbal and non-verbal communicative behaviours and fluency and connectedness were measured from the 12-month videos. Predictive validity of 12-month behaviours was calculated in relation to mean length of utterance and number of unique words at 24 months and Clinical Evaluation of Language Fundamentals Preschool-Second Edition (CELF-P2) Core Language scores at 36 months.All 12-month behaviours had adequate specificity but poor sensitivity when compared with other predictive validity studies using published early language measures. However, in adjusted regression models, fluency and connectedness and verbal behaviours at 12 months predicted unique words at 24 months. Fluency and connectedness also predicted CELF-P2 scores at 36 months.Findings reconfirm the difficulty in early identification of children at risk of later language difficulties. All 12-month measures were more accurate at identifying those children who will have better language than those children who will not. As fluency and connectedness was the only measure to predict 24- and 36-month language in adjusted regression models, it may be an important factor to consider when measuring early language skills for infants experiencing adversity. Future research could combine observational measures of early communication and fluency and connectedness with other predictors of language to try to increase prediction accuracy.

In this paper we review the design and development of a 100 J, 10 Hz nanosecond pulsed laser, codenamed DiPOLE100X, being built at the Central Laser Facility (CLF). This 1 kW average power diode-pumped solid-state laser (DPSSL) is based on a master oscillator power amplifier (MOPA) design, which includes two cryogenic gas cooled amplifier stages based on DiPOLE multi-slab ceramic Yb:YAG amplifier technology developed at the CLF. The laser will produce pulses between 2 and 15 ns in duration with precise, arbitrarily selectable shapes, at pulse repetition rates up to 10 Hz, allowing real-time shape optimization for compression experiments. Once completed, the laser will be delivered to the European X-ray Free Electron Laser (XFEL) facility in Germany as a UK-funded contribution in kind, where it will be used to study extreme states of matter at the High Energy Density (HED) instrument.

We describe the application of the adhesive-free bonding (AFB) technique to form crystalline Yb:YAG gain media slabs. We demonstrate that the AFB technique is a viable alternative for producing large aperture slabs for high-energy lasers.

We propose the application of the Gas Cluster Ion Beam (GCIB) and of the Accelerated Neutral Atom Beam (ANAB) surface treatments to ceramic Yb:YAG gain material and demonstrate their suitability for high energy laser applications.