197 results on '"Yuxin, Leng"'
Search Results
2. Towards High-Repetition-Rate Intense Terahertz Source With Metal Wire-Based Plasma
- Author
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Dongdong Zhang, Yafeng Bai, Yushan Zeng, Yingying Ding, Zhongpeng Li, Chuliang Zhou, Yuxin Leng, Liwei Song, Ye Tian, and Ruxin Li
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THz sources ,Plasmas ,THZ optics ,Applied optics. Photonics ,QC350-467 ,Electrical and Electronic Engineering ,Optics. Light ,Atomic and Molecular Physics, and Optics ,TA1501-1820 - Abstract
Terahertz radiation can provide unprecedented vistas in physical studies such as transient matter state control and advanced free-electron manipulation. Here, we present one feasible path towards high-repetition-rate, intense THz sources by combining the wire-based THz source on a consecutively running, wire-conveying tape design. The proof-of-principle experimental results show an upper 30 mW average THz power output under 1 kHz laser excitation, which presents the first high-repetition-rate, and most importantly, portable and application in handy THz source that is generated by solid plasmas. The generated THz pulses are characterized with a 0.3 THz center frequency and ∼0.3 THz bandwidth. We believe this tabletop laser-driven high-repetition-rate THz source will open a new door for THz and related interdisciplinary sciences.
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- 2022
3. Toward 3D Imaging of Femtosecond Laser Filament in Air by A CCD within A Single Exposure
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Yingxia Wei, Tiejun Wang, Juan Long, Fukang Yin, Xinyi Ding, Bin Zhu, Kainan Zhou, Jianhui Bin, and Yuxin Leng
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Atomic and Molecular Physics, and Optics - Abstract
We experimentally demonstrated the 3D propagation of laser filament in air by an Fabry-Pérot (F-P) cavity assisted imaging within a single exposure. The F-P cavity was composed of two parallel mirrors with certain reflectivity and transmission at filament laser, so that the beam was reflected and refracted multiple times between the two mirrors. The cross-sectional intensity patterns at different longitudinal positions along filament within a single exposure of CCD (Charge-coupled Device) were recorded. When keeping the incident angle of the F-P cavity as a constant and reducing its spacing distance, a better longitudinally resolved evolution of cross-sectional filament intensity patterns was obtained. The intensity evolution along laser filament by the F-P cavity assisted imaging method was consistent with the filament fluorescence measurement from the side. As an application, the transition of laser propagation from linear to nonlinear was unveiled by the F-P cavity assisted 3D imaging.
- Published
- 2023
4. Self‐Referencing 3D Characterization of Ultrafast Optical‐Vortex Beams Using Tilted Interference TERMITES Technique
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Jinyu Pan, Yifei Chen, Zhiyuan Huang, Cheng Zhang, Tiandao Chen, Donghan Liu, Ding Wang, Meng Pang, and Yuxin Leng
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Condensed Matter Physics ,Atomic and Molecular Physics, and Optics ,Electronic, Optical and Magnetic Materials - Published
- 2023
5. Measurement of electron beam transverse slice emittance using a focused beamline
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Kangnan Jiang, Ke Feng, Hao Wang, Xiaojun Yang, Peile Bai, Yi Xu, Yuxin Leng, Wentao Wang, and Ruxin Li
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Nuclear and High Energy Physics ,Nuclear Energy and Engineering ,Atomic and Molecular Physics, and Optics ,Electronic, Optical and Magnetic Materials - Abstract
A single-shot measurement of electron emittance was experimentally accomplished using a focused transfer line with a dipole. The betatron phase of electrons based on laser wakefield acceleration (LWFA) is energy dependent owing to the coupling of the longitudinal acceleration field and the transverse focusing (defocusing) field in the bubble. The phase space presents slice information after phase compensation relative to the center energy. Fitting the transverse size of the electron beam at different energy slices in the energy spectrum measured 0.27 mm mrad in the experiment. The diagnosis of slice emittance facilitates local electron quality manipulation, which is important for the development of LWFA-based free electron lasers. The quasi-3D particle-in-cell simulations matched the experimental results and analysis well.
- Published
- 2023
6. Ultra-broadband pulse generation via hollow-core fiber compression and frequency doubling for ultra-intense lasers
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Yanyan Li, Beijie Shao, Yujie Peng, Junyu Qian, Wenkai Li, Xinliang Wang, Xingyan Liu, Xiaoming Lu, Yi Xu, Yuxin Leng, and Ruxin Li
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Nuclear and High Energy Physics ,Nuclear Energy and Engineering ,Atomic and Molecular Physics, and Optics ,Electronic, Optical and Magnetic Materials - Abstract
We demonstrate an ultra-broadband high temporal contrast infrared laser source based on cascaded optical parametric amplification, hollow-core fiber (HCF) and second harmonic generation processes. In this setup, the spectrum of an approximately 1.8 μm laser pulse has near 1 μm full bandwidth by employing an argon gas-filled HCF. Subsequently, after frequency doubling with cascaded crystals and dispersion compensation by a fused silica wedge pair, 9.6 fs (~3 cycles) and 150 μJ pulses centered at 910 nm with full bandwidth of over 300 nm can be generated. The energy stability of the output laser pulse is excellent with 0.8% (root mean square) over 20 min, and the temporal contrast is >1012 at –10 ps before the main pulse. The excellent temporal and spatial characteristics and stability make this laser able to be used as a good seed source for ultra-intense and ultrafast laser systems.
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- 2023
7. High temporal contrast 1053 nm laser source based on optical parametric amplification and second-harmonic generation
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Liya Shen, Yanyan Li, Wenkai Li, Jiajun Song, Junyu Qian, Jianyu Sun, Renyu Feng, Yujie Peng, and Yuxin Leng
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Nuclear and High Energy Physics ,Nuclear Energy and Engineering ,Atomic and Molecular Physics, and Optics ,Electronic, Optical and Magnetic Materials - Abstract
Temporal contrast directly affects the interaction between ultraintense and ultrashort pulse lasers with matter. Seed laser sources with broad bandwidth and high temporal contrast are significant for overall temporal contrast enhancement. The technique of cascaded nonlinear processes with optical parametric amplification and second-harmonic generation is demonstrated for high temporal contrast seed source generation. Within 40 ps before the main pulse, the temporal contrast reaches over 1011. The pulse energy and duration of the high-contrast pulse are 112 μJ and 70 fs, respectively. Considering its high beam quality and stability, this laser source can serve as a high-quality seed for Nd:glass-based ultraintense and ultrashort pulse laser facilities.
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- 2023
8. Simulating spatiotemporal dynamics of ultra-intense ultrashort lasers through imperfect grating compressors
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Zhaoyang Li, Jun Liu, Yi Xu, Yuxin Leng, and Ruxin Li
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Atomic and Molecular Physics, and Optics - Abstract
The upcoming 100 Petawatt (PW) laser is going to provide a possibility to experimentally study vacuum physics. Pulse compression and beam focusing, which can be affected by the spatiotemporal coupling, are two key processes of generating a 100 PW laser and then determine whether its physical objective can be achieved or not. We improved our previous model of the spatiotemporal coupling where only the grating wavefront error and the output optical field of a common compressor configuration were included, and in the improved model, the grating amplitude modulation, the spatio-spectral clipping, and the optical field inside the compressor were added. By using it, we theoretically investigated the spatiotemporal dynamics of an ultra-intense ultrashort laser passing through an imperfect grating compressor for different cases, especially the spatio-temporal/spectral coupling and the on-target intensity variation induced by the phase and amplitude modulation at different grating positions in two different compressor configurations. This study is of importance for both engineering development and physical application of the upcoming Exawatt-class laser.
- Published
- 2022
9. Angular dispersion compensation for ultra-broadband pulses by using a cascaded prism and hollow-core fiber configuration
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Jiabing Hu, Xinliang Wang, Xingyan Liu, Yingbin Long, Peile Bai, Fenxiang Wu, Zongxin Zhang, Haidong Chen, Xihang Yang, Xiaojun Yang, Jiayi Qian, Jiayan Gui, Yi Xu, and Yuxin Leng
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Atomic and Molecular Physics, and Optics - Abstract
In this paper, we report that the angular dispersion of the output pulses in a nonlinear process can be efficiently compensated by using a cascaded prism(s) and short hollow-core fiber (HCF) configuration. Here, the prism(s) is used to suppress the angular dispersion and transform it into spatial chirp, while the HCF is used for removing this spatial chirp and the residual angular dispersion, which can also significantly improve the beam quality. The feasibility of this novel method is numerically and experimentally investigated with the ultra-broadband idler pulses centered at 1250 nm wavelength and generated by an LBO crystal based non-collinear optical parametric amplifier. The proof-of-principle experiment shows that the angular dispersion can be effectively removed and ultra-broadband idler pulses with good spectral quality and spatial profile can be obtained. The total transmission efficiency in the experiment is around 67% and the measured M x 2 and M y 2 can reach 1.12 and 1.04, respectively. To the best of our knowledge, this is the first reported ultra-broadband angular dispersion compensation scheme combining prism(s) and HCF, which can remarkably eliminate the angular dispersion while simultaneously possesses high efficiency, good spectral and beam spatial quality.
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- 2022
10. Direct Acceleration of an Annular Attosecond Electron Slice Driven by Near-Infrared Laguerre–Gaussian Laser
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Wang Wenyu, Ruxin Li, C. Jiang, Z.Z. Xu, Yuxin Leng, H. Dong, and S. Weber
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Physics ,Nuclear and High Energy Physics ,business.industry ,Attosecond ,Electron ,Laser ,Atomic and Molecular Physics, and Optics ,Linear particle accelerator ,Collimated light ,Electronic, Optical and Magnetic Materials ,law.invention ,Vortex ,Acceleration ,Optics ,Nuclear Energy and Engineering ,law ,Antiproton ,Physics::Accelerator Physics ,business - Abstract
A new near-infrared direct acceleration mechanism driven by Laguerre-Gaussian laser is proposed to stably accelerate and concentrate electron slice both in longitudinal and transversal directions in vacuum. Three-dimensional simulations show that a 2-mu m circularly polarized LG(p)(l) (p = 0, 1 = 1, sigma(z) = -1) laser can directly manipulate attosecond electron slices in additional dimensions (angular directions) and give them annular structures and angular momentums. These annular vortex attosecond electron slices are expected to have some novel applications such as in the collimation of antiprotons in conventional linear accelerators, edge-enhancement electron imaging, structured X-ray generation, and analysis and manipulation of nanomaterials.
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- 2021
11. Highly stable, flexible delivery of microjoule-level ultrafast pulses in vacuumized anti-resonant hollow-core fibers for active synchronization
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Chuanchuan Yan, Hongyang Li, Zhiyuan Huang, Xinliang Wang, Donghan Liu, Xingyan Liu, Jinyu Pan, Zhuozhao Luo, Fei Yang, Yu Zheng, Ruochen Yin, Haihu Yu, Yuxin Leng, Liwei Song, Meng Pang, and Xin Jiang
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FOS: Physical sciences ,Atomic and Molecular Physics, and Optics ,Optics (physics.optics) ,Physics - Optics - Abstract
We demonstrate the stable and flexible light delivery of multi-microjoule, sub-200-fs pulses over a ∼10-m-long vacuumized anti-resonant hollow-core fiber (AR-HCF), which was successfully used for high-performance pulse synchronization. Compared with the pulse train launched into the AR-HCF, the transmitted pulse train out of the fiber exhibits excellent stabilities in pulse power and spectrum, with pointing stability largely improved. The walk-off between the fiber-delivery and the other free-space-propagation pulse trains, in an open loop, was measured to be −7. This walk-off can be further suppressed to ∼2 fs rms simply by using an active control loop, highlighting the great application potentials of this AR-HCF setup in large-scale laser and accelerator facilities.
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- 2023
12. Further Development of the Short‐Pulse Petawatt Laser: Trends, Technologies, and Bottlenecks
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Zhaoyang Li, Yuxin Leng, and Ruxin Li
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Condensed Matter Physics ,Atomic and Molecular Physics, and Optics ,Electronic, Optical and Magnetic Materials - Published
- 2023
13. Direct mapping of attosecond electron dynamics
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Yi Xu, Chuliang Zhou, Ruxin Li, Xiao-Ming Lu, Ye Tian, Yuxin Leng, Yushan Zeng, Dongdong Zhang, Jiansheng Liu, Liwei Song, Zhizhan Xu, and Y. Bai
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Free electron model ,Physics ,business.industry ,Attosecond ,Far-infrared laser ,Physics::Optics ,02 engineering and technology ,Electron ,021001 nanoscience & nanotechnology ,Laser ,01 natural sciences ,Atomic and Molecular Physics, and Optics ,Streaking ,Electronic, Optical and Magnetic Materials ,law.invention ,010309 optics ,Optics ,Deflection (physics) ,law ,Temporal resolution ,0103 physical sciences ,Physics::Atomic Physics ,0210 nano-technology ,business - Abstract
The subcycle interaction of light and electrons has been one of the key frontiers in free-electron lasers, attosecond science and dynamical investigation of matter. Capturing the underlying subcycle dynamics of electrons with an optical field promises fascinating vistas with unprecedented temporal resolution. Yet the rigorous synchronization requirement has kept its realization out of reach. Here, by direct spatial observation of periodic electron bunch fringes, we demonstrate a laser streaking concept for revealing the dynamics of free electrons emitted from a plasma mirror under sub-relativistic laser intensity. Field-induced electron beam deflection demonstrates subcycle charge dynamics with a streaking speed of ~60 μrad as−1. This provides us with an attosecond-resolution metrology to obtain more direct evidence about the light-field-induced electron dynamics in the plasma mirror. Our results offer unprecedented characterization of attosecond dynamics and open the way to extensive experimental investigations of the interaction of attosecond electrons with intense lasers. By focusing a sub-relativistic infrared laser pulse onto a silica target, a periodic deflection pattern of attosecond electron pulse trains is observed. It reveals these subcycle charge dynamics with a streaking speed of ~60 μrad as−1.
- Published
- 2020
14. Advances in inorganic and hybrid perovskites for miniaturized lasers
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Yuxin Leng, Zhengzheng Liu, Juan Du, Sihao Huang, and Chunwei Wang
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Materials science ,QC1-999 ,Physics::Optics ,02 engineering and technology ,010402 general chemistry ,01 natural sciences ,law.invention ,Condensed Matter::Materials Science ,Laser linewidth ,law ,Stimulated emission ,Electrical and Electronic Engineering ,perovskite ,Perovskite (structure) ,business.industry ,Physics ,fabry–pérot cavity ,semiconductor ,021001 nanoscience & nanotechnology ,Laser ,Atomic and Molecular Physics, and Optics ,ase ,laser ,0104 chemical sciences ,Electronic, Optical and Magnetic Materials ,Semiconductor ,Optoelectronics ,Whispering-gallery wave ,Photonics ,0210 nano-technology ,business ,Lasing threshold ,whispering gallery mode ,Biotechnology - Abstract
The rapid advancement of perovskite-based optoelectronics devices has caught the world’s attention due to their outstanding properties, such as long carrier lifetime, low defect trap density, large absorption coefficient, narrow linewidth and high optical gain. Herein, the photonic lasing properties of perovskites are reviewed since the first stimulated emission of perovskites observed in 2014. The review is mainly focused on 3D structures based on their inherently active microcavities and externally passive microcavities of the perovskites. First, the fundamental properties in terms of crystal structure and optical characteristics of perovskites are reviewed. Then the perovskite lasers are classified into two sections based on the morphology features: the ability/inability to support lasing behaviors by themselves. Every section is further divided into two kinds of cavities according to the light reflection paths (Standing wave for the Fabry–Pérot cavity and travelling wave for the Whispering-Gallery-Mode cavity). The lasing performance involves fabrication methods, cavity sizes, thresholds, quality factors, pumping sources, etc. Finally, some challenges and prospects for perovskite lasers are given.
- Published
- 2020
15. Near-Infrared Supercontinuum and Ultrashort Pulses Generated Based on Phase-Mismatched Cascaded Frequency Conversion in DSTMS Crystal
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Beijie Shao, Ruxin Li, Yingying Ding, Liwei Song, Junyu Qian, Zhe Liu, Yuxin Leng, Yanyan Li, Ye Tian, Yujie Peng, Pengfei Wang, and Y. Bai
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lcsh:Applied optics. Photonics ,Ultrafast technology ,Materials science ,Terahertz radiation ,01 natural sciences ,010309 optics ,Crystal ,terahertz ,Optical rectification ,0103 physical sciences ,Dispersion (optics) ,lcsh:QC350-467 ,Electrical and Electronic Engineering ,010306 general physics ,business.industry ,Pulse duration ,nonlinearity ,lcsh:TA1501-1820 ,pulse compression ,Atomic and Molecular Physics, and Optics ,Supercontinuum ,Wavelength ,Pulse compression ,Optoelectronics ,business ,lcsh:Optics. Light - Abstract
A near-infrared (NIR) supercontinuum and ultrashort pulses are generated via phase-mismatched cascaded frequency conversion in DSTMS (4-N, N-dimethylamino-4'-N'-methyl-stilbazolium 2, 4, 6-trimethylbenzenesulfonate) crystal. NIR pulses with a central wavelength of 1.5 μm and 63 fs pulse duration are incident into the crystal, and the spectrum is broadened to over 1200-2100 nm. Compensating the dispersion by fused silica, ultrashort NIR pulses with 16.6 fs pulse duration are obtained. Meanwhile, intense single-cycle terahertz pulses are generated via optical rectification in DSTMS crystal.
- Published
- 2020
16. Dispersion management for a 100 PW level laser using a mismatched-grating compressor
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Fenxiang Wu, Jiabing Hu, Xingyan Liu, Zongxin Zhang, Peile Bai, Xinliang Wang, Yang Zhao, Xiaojun Yang, Yi Xu, Cheng Wang, Yuxin Leng, and Ruxin Li
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Nuclear and High Energy Physics ,Nuclear Energy and Engineering ,Atomic and Molecular Physics, and Optics ,Electronic, Optical and Magnetic Materials - Abstract
We report dispersion management based on a mismatched-grating compressor for a 100 PW level laser, which utilizes optical parametric chirped pulse amplification and also features large chirped pulse duration and an ultra-broadband spectrum. The numerical calculation indicates that amplified pulses with 4 ns chirped pulse duration and 210 nm spectral bandwidth can be directly compressed to sub-13 fs, which is close to the Fourier-transform limit (FTL). More importantly, the tolerances of the mismatched-grating compressor to the misalignment of the stretcher, the error of the desired grating groove density and the variation of material dispersion are comprehensively analyzed, which is crucially important for its practical application. The results demonstrate that good tolerances and near-FTL compressed pulses can be achieved simultaneously, just by keeping a balance between the residual second-, third- and fourth-order dispersions in the laser system. This work can offer a meaningful guideline for the design and construction of 100 PW level lasers.
- Published
- 2022
17. Three-Dimensional Dynamic Optical Trapping Using Non-Iterative Computer-Generated Holography
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Fengyu Sun, Linwei Zhu, Wenpeng Wang, Zhiyong Shi, Yanqi Liu, Yi Xu, Qiang Shi, Yuxin Leng, and Ruxin Li
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History ,Polymers and Plastics ,Mechanical Engineering ,Electrical and Electronic Engineering ,Business and International Management ,Atomic and Molecular Physics, and Optics ,Industrial and Manufacturing Engineering ,Electronic, Optical and Magnetic Materials - Published
- 2022
18. Measurements of microjoule-level, few-femtosecond ultraviolet dispersive-wave pulses generated in gas-filled hollow capillary fibers
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Cheng Zhang, Tiandao Chen, Jinyu Pan, Zhiyuan Huang, Donghan Liu, Ding Wang, Fei Yu, Dakun Wu, Yu Zheng, Ruochen Yin, Xin Jiang, Meng Pang, Yuxin Leng, and Ruxin Li
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FOS: Physical sciences ,Atomic and Molecular Physics, and Optics ,Physics - Optics ,Optics (physics.optics) - Abstract
High-energy ultraviolet pulse generation in gas-filled hollow capillary fibers (HCFs) through dispersive-wave-emission process, has attracted considerable attentions in recent several years due to its great application potentials in ultraviolet spectroscopy and photochemistry. While the ability of this technique to deliver high-energy, ultrafast ultraviolet pulses is widely recognized, few-fs duration of {\mu}J-level dispersive-wave (DW) pulses has, however, escaped direct measurements. In this letter, we demonstrate that using several chirped mirrors, few-fs ultraviolet DW pulses can be obtained in atmosphere environment without the use of vacuum chambers. The pulse temporal profiles, measured using a self-diffraction frequency-resolved optical gating set-up, exhibit full-width-half-maximum pulse widths of 9.6 fs at 384 nm and 9.4 fs at 430 nm, close to the Fourier-transform limits. Moreover, theoretical and experimental studies reveal the strong influences of driving pulse energy and HCF length on temporal width and shape of the measured DW pulses. The ultraviolet pulses obtained in atmosphere environment with {\mu}J-level pulse energy, few-fs pulse width and broadband wavelength tunability are ready to be used in many applications.
- Published
- 2022
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19. Temporal contrast enhancement by nonlinear elliptical polarization rotation in a multi-pass cell
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Jiajun Song, Liya Shen, Jianyu Sun, Yujie Peng, and Yuxin Leng
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Nuclear and High Energy Physics ,Nuclear Energy and Engineering ,Atomic and Molecular Physics, and Optics ,Electronic, Optical and Magnetic Materials - Abstract
We demonstrate the simultaneous temporal contrast improvement and pulse compression of a Yb-doped femtosecond laser via nonlinear elliptical polarization rotation in a solid state multi-pass cell. The temporal contrast is improved to 109, while the pulse is shortened from 181 to 36 fs, corresponding to a compression factor of 5. The output beam features excellent beam quality with M2 values of 1.18 × 1.16. The total efficiency of the contrast enhancement system exceeds 50%. This technique will have wide applications in high temporal contrast ultra-intense femtosecond lasers.
- Published
- 2022
20. Forty-five terawatt vortex ultrashort laser pulses from a chirped-pulse amplification system
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Zhenkuan Chen, Shuiqin Zheng, Xiaoming Lu, Xinliang Wang, Yi Cai, Congying Wang, Maijie Zheng, Yuexia Ai, Yuxin Leng, Shixiang Xu, and Dianyuan Fan
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Nuclear and High Energy Physics ,Nuclear Energy and Engineering ,Atomic and Molecular Physics, and Optics ,Electronic, Optical and Magnetic Materials - Abstract
We report on a vortex laser chirped-pulse amplification (CPA) system that delivers pulses with a peak power of 45 TW. A focused intensity exceeding 1019 W/cm2 has been demonstrated for the first time by the vortex amplification scheme. Compared with other schemes of strong-field vortex generation with high energy flux but narrowband vortex-converting elements at the end of the laser, an important advantage of our scheme is that we can use a broadband but size-limited q-plate to realize broadband mode-converting in the front end of the CPA system, and achieve high-power amplification with a series of amplifiers. This method is low cost and can be easily implemented in an existing laser system. The results have verified the feasibility to obtain terawatt and even petawatt vortex laser amplification by a CPA system, which has important potential applications in strong-field laser physics, for example, generation of vortex particle beams with orbital angular momentum, fast ignition for inertial confinement fusion and simulation of the extreme astrophysical environment.
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- 2022
21. Femtosecond infrared optical vortex lasers based on optical parametric amplification
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Renyu Feng, Junyu Qian, Yujie Peng, Yanyan Li, Wenkai Li, Yuxin Leng, and Ruxin Li
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Nuclear and High Energy Physics ,Nuclear Energy and Engineering ,Atomic and Molecular Physics, and Optics ,Electronic, Optical and Magnetic Materials - Abstract
Infrared femtosecond optical vortices open up many new research fields, such as optical micro–nano manipulation, time-resolved nonlocal spectroscopy in solids, vortex secondary radiation and particle generations. In this article, we demonstrate a femtosecond optical vortex laser system based on a two-stage optical parametric amplifier. In our experiment, 1.45 μm vortex signal pulses with energy of 190 μJ and 1.8 μm vortex idler pulses with energy of 158 μJ have been obtained, and the pulse durations are 51 and 48 fs, respectively. Both the energy fluctuations of the signal and idler pulses are less than 0.5% (root mean square), and the spectral fluctuations are less than 1.5% within 1 hour. This type of highly stable femtosecond optical vortex laser has a wide range of applications for vortex strong-field physics.
- Published
- 2022
22. Thickness-dependent loss-induced failure of an ideal ENZ-enhanced optical response in planar ultrathin transparent conducting oxide films
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Hang Jiang, Yuanan Zhao, Hao Ma, Yi Wu, Meiling Chen, Mengxia Wang, Weili Zhang, Yujie Peng, Yuxin Leng, Zhaoliang Cao, and Jianda Shao
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Atomic and Molecular Physics, and Optics - Abstract
Ultrathin planar transparent conducting oxide (TCO) films are commonly used to enhance the optical response of epsilon-near-zero (ENZ) devices; however, our results suggest that thickness-dependent loss renders them ineffective. Here, we investigated the thickness-dependent loss of indium tin oxide (ITO) films and their effect on the ENZ-enhanced optical responses of ITO and ITO/SiO2 multilayer stacks. The experimental and computational results show that the optical loss of ITO films increases from 0.47 to 0.70 as the thickness decreases from 235 to 52 nm, which results in a reduction of 60% and 45% in the maximum field enhancement factor of a 52-nm monolayer ITO and 4-layer ITO/SiO2 multilayer stack, respectively. The experimental results show that the ENZ-enhanced nonlinear absorption coefficient of the 52-nm single-layer ITO film is -1.6 × 103 cm GW-1, which is 81% lower than that of the 235-nm ITO film (-8.6 × 103 cm GW-1), indicating that the thickness-dependent loss makes the ultrathin TCO films unable to obtain greater nonlinear responses. In addition, the increased loss reduces the cascading Berreman transmission valley intensity of the 4-layer ITO/SiO2 multilayer stack, resulting in a 42% reduction in the ENZ-enhanced nonlinear absorption coefficient compared to the 235-nm ITO film and a faster hot electron relaxation time. Our results suggest that the thickness and loss trade-off is an intrinsic property of TCO films and that the low-loss ultrathin TCO films are the key to the robust design and fabrication of novel ENZ devices based on flat ultrathin TCO films.
- Published
- 2023
23. Further Development of the Short‐Pulse Petawatt Laser: Trends, Technologies, and Bottlenecks (Laser Photonics Rev. 17(1)/2023)
- Author
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Zhaoyang Li, Yuxin Leng, and Ruxin Li
- Subjects
Condensed Matter Physics ,Atomic and Molecular Physics, and Optics ,Electronic, Optical and Magnetic Materials - Published
- 2023
24. Generation and application of high-contrast laser pulses using plasma mirror in the SULF-1PW beamline
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Cheng Jiang, Zongxin Zhang, Hao Dong, Zhiyong Shi, Jianzhi He, Shufa Hao, Fengyu Sun, Jiayan Gui, Jiayi Qian, Jiacheng Zhu, Wenpeng Wang, Yi Xu, Xiaoyan Liang, Yuxin Leng, and Ruxin Li
- Subjects
Electrical and Electronic Engineering ,Atomic and Molecular Physics, and Optics ,Electronic, Optical and Magnetic Materials - Published
- 2023
25. Two-Photon Pumped Amplified Spontaneous Emission and Lasing from Formamidinium Lead Bromine Nanocrystals
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Jie Yang, Juan Du, Zeyu Zhang, Yuxin Leng, Weimin Liu, Xiaosheng Tang, Zhiping Hu, and Zhengzheng Liu
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Amplified spontaneous emission ,Materials science ,Bromine ,business.industry ,Nanolaser ,chemistry.chemical_element ,02 engineering and technology ,021001 nanoscience & nanotechnology ,01 natural sciences ,Atomic and Molecular Physics, and Optics ,Electronic, Optical and Magnetic Materials ,010309 optics ,Formamidinium ,Two-photon excitation microscopy ,Nanocrystal ,chemistry ,0103 physical sciences ,Optoelectronics ,Electrical and Electronic Engineering ,0210 nano-technology ,business ,Lasing threshold ,Biotechnology ,Diode - Abstract
Formamidinium (FA) perovskites have exhibited outstanding optoelectronic properties in solar cells and light-emitting diodes. However, their development on nanolaser application have rarely been ex...
- Published
- 2019
26. Mapping non-laminar proton acceleration in laser-driven target normal sheath field
- Author
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H. Zhang, Yi Xu, Liangliang Ji, J. Y. Qian, Fenxiang Wu, Baifei Shen, S. Li, Yuxin Leng, Z. X. Zhang, A. X. Li, C.Y. Qin, Xiaoyan Liang, S. H. Zhai, Ruxin Li, and J. Y. Gui
- Subjects
Physics ,Nuclear and High Energy Physics ,Proton ,Field (physics) ,Laminar flow ,Laser ,Atomic and Molecular Physics, and Optics ,Electronic, Optical and Magnetic Materials ,law.invention ,Computational physics ,Acceleration ,Nuclear Energy and Engineering ,law ,Physics::Accelerator Physics - Abstract
We report on experimental observation of non-laminar proton acceleration modulated by a strong magnetic field in laser irradiating micrometer aluminum targets. The results illustrate the coexistence of ring-like and filamentation structures. We implement the knife edge method into the radiochromic film detector to map the accelerated beams, measuring a source size of 30–110 μm for protons of more than 5 MeV. The diagnosis reveals that the ring-like profile originates from low-energy protons far off the axis whereas the filamentation is from the near-axis high-energy protons, exhibiting non-laminar features. Particle-in-cell simulations reproduced the experimental results, showing that the short-term magnetic turbulence via Weibel instability and the long-term quasi-static annular magnetic field by the streaming electric current account for the measured beam profile. Our work provides direct mapping of laser-driven proton sources in the space-energy domain and reveals the non-laminar beam evolution at featured time scales.
- Published
- 2021
27. Optimizing sub-nanosecond laser conditioning of DKDP crystals by varying the temporal shape of the pulse
- Author
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Guozong Zheng, Yafei Lian, Yujie Peng, Jianda Shao, Yuanan Zhao, Xinlin Lv, Li Ting, Xiangyu Zhu, and Yuxin Leng
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Materials science ,Pulse (signal processing) ,Scanning electron microscope ,business.industry ,Laser ,Atomic and Molecular Physics, and Optics ,law.invention ,Core (optical fiber) ,Optics ,Laser damage ,law ,Thermal ,Conditioning ,Nanosecond laser ,business - Abstract
We propose a strategy to optimize the laser conditioning of DKDP crystals by varying the temporal shape of sub-nanosecond pulses. Four sub-ns temporally shaped pulses with nearly the same full width at half maxima of ∼600 ps but different rising-falling statuses were designed to conduct laser-induced damage (LID) and laser conditioning experiments on DKDP crystals. The shape of the pulse substantially influences the damage pinpoints size and LID threshold (LIDT) of the crystals in the sub-nanosecond range. After sub-nanosecond laser conditioning, the ns R-on-1 LIDT showed that slow-rising fast-falling pulse (R400-F200 and High-foot pulses) conditioning achieved a 14%-20% LIDT enhancement than the traditional Gaussian pulse (R300-F300 pulse). The 8-ns laser damage morphologies after slow-rising fast-falling pulse conditioning showed cracks, whereas those after fast-rising slow-falling pulse (R200-F400 pulse) conditioning were pinpoint core, as usual. These results suggest that the rising front plays an important role in the LID and laser conditioning of the DKDP crystals. A pulse with a slower rising front is beneficial for thermal modification, thereby leading to better LID properties. This strategy greatly expands and enriches the manipulation methods to improve the LIDT of DKDP crystals, and sheds light on understanding the laser damage mechanisms.
- Published
- 2021
28. Performance improvement of a nonlinear temporal filter by using cascaded femtosecond optical parametric amplification
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Zongxin Zhang, Xiao-Ming Lu, Peile Bai, Haidong Chen, Yanqi Liu, Yi Xu, Jiayi Qian, Jiabing Hu, Xihang Yang, Gui Jiayan, Yang Xiaojun, Xinliang Wang, Fenxiang Wu, Yanyan Li, and Yuxin Leng
- Subjects
Materials science ,Sum-frequency generation ,business.industry ,Laser ,Optical parametric amplifier ,Atomic and Molecular Physics, and Optics ,law.invention ,Nonlinear system ,Optics ,law ,Spectral width ,Femtosecond ,business ,Self-phase modulation ,Pulse-width modulation - Abstract
In this paper, we report that the conversion efficiency and spectrum of femtosecond optical parametric amplification (fs-OPA) can be significantly enhanced by employing a compact cascaded femtosecond OPA (CF-OPA) scheme with the self-compensation of the temporal walk-off between two nonlinear gain media. Correspondingly, the gain related temporal contrast can also be improved. The feasibility of the CF-OPA method using three cascaded BBO crystals is numerically and experimentally analyzed. Moreover, by replacing the conventional fs-OPA with the CF-OPA and optimizing the design, the performance of a nonlinear temporal filter combining cross-polarized wave generation and fs-OPA is comprehensively improved. The experimental results demonstrate the superiority of the CF-OPA scheme, which can generate high-performance cleaned pulses at 1 kHz repetition rate with energy of 340μJ, energy fluctuation below 0.9% (RMS), spectral width of 97 nm (FWHM), Fourier-transform-limited pulse width of 12 fs and temporal contrast better than 10−12. To the best of our knowledge, this is the first reported temporal walk-off self-compensated quasi-collinear CF-OPA geometry adopting three cascaded BBO crystals, which can be easily generalized to other wavelengths or nonlinear crystals. The above nonlinear temporal filter with a CF-OPA scheme has the rarest comprehensive parameters, which can provide excellent seed pulses for PW and 10 PW class femtosecond laser systems.
- Published
- 2021
29. Low-dispersion mirror with a broad bandwidth and high laser damage resistance
- Author
-
Kui Yi, Yu Cao, Zhihao Wang, Yuxin Leng, Ruiyi Chen, Yanzhi Wang, Ruxin Li, Yunxia Jin, Yuchuan Shao, Jianda Shao, and Yuhui Zhang
- Subjects
Materials science ,business.industry ,Physics::Optics ,Dielectric ,Laser ,Atomic and Molecular Physics, and Optics ,law.invention ,Wavelength ,Optics ,law ,Electric field ,Dispersion (optics) ,Bandwidth (computing) ,business ,Ultrashort pulse ,Group delay and phase delay - Abstract
A low-dispersion mirror (LDM), an important component in ultrafast laser systems, requires both a broad low-dispersion laser-induced damage threshold (LIDT). It is difficult for a traditional quarter-wavelength-based dielectric LDM to achieve these characteristics at the same time. We propose a novel, to the best of our knowledge, low-dispersion mirror (NLDM) that combines periodic chirped layers at the top and alternating quarter-wavelength layers at the bottom. Low dispersion is achieved by introducing a large same group delay (GD) for different wavelengths, so the bandwidth is broadened greatly. In addition, owing to the staggered electric field intensity peak effect in the structure, the NLDM shows the potential for high laser damage resistance. The experiments demonstrated that the NLDM doubles the low-dispersion bandwidth, while the LIDT is also increased compared with the LDM. This novel concept results in improved performance and paves the way toward a new generation of the LDM for ultrafast bandwidth and a high laser applications.
- Published
- 2021
30. Reducing temporal pedestal in a Ti:sapphire chirped-pulse amplification system by using a stretcher based on two concave mirrors
- Author
-
Yuxin Leng, Xiao-Ming Lu, Jinfeng Li, and Hui Zhang
- Subjects
Chirped pulse amplification ,Materials science ,Physics::Instrumentation and Detectors ,business.industry ,Laser ,Atomic and Molecular Physics, and Optics ,law.invention ,Pulse (physics) ,Optics ,Pedestal ,Regenerative amplification ,law ,Phase noise ,Sapphire ,business ,Inertial confinement fusion - Abstract
We demonstrate the temporal pedestal suppression in a Ti:sapphire chirped-pulse amplification laser system. The far-field spectral phase noise can be avoided by using a stretcher based on two concave mirrors in the system, reducing the intensity and the time range of the amplified pulse’s pedestal. At the amplified energy of 1.7 J, the contrast measurement showed that the pedestal intensity was at a level of about 1 0 − 10 within a 10 ps time window near the main pulse. In the proton acceleration experiment, a 10 nm thickness CH target was irradiated by the high-contrast pulse with the focused intensity of ∼ 1.4 × 1 0 20 W / c m 2 , which generated a proton beam with a cutoff energy of 16 MeV.
- Published
- 2021
31. Nano‐Confined Growth of Perovskite Quantum Dots in Transparent Nanoporous Glass for Luminescent Chemical Sensing
- Author
-
Zhiping Hu, Yiguang Jiang, Fengxian Zhou, Chunlin Chen, Jin He, Zijun Zhan, Zhengzheng Liu, Juan Du, Long Zhang, and Yuxin Leng
- Subjects
Atomic and Molecular Physics, and Optics ,Electronic, Optical and Magnetic Materials - Published
- 2022
32. Wavefront Correction in Vacuum of SULF-1PW Laser Beamline
- Author
-
Fenxiang Wu, Ende Li, Yi Xu, Jiayi Qian, Jiacheng Zhu, Jiabing Hu, Yang Zhao, Peile Bai, Zongxin Zhang, Yuxin Leng, and Zeping Yang
- Subjects
high peak power lasers ,adaptive optical system ,wavefront correction ,stability ,Radiology, Nuclear Medicine and imaging ,Instrumentation ,Atomic and Molecular Physics, and Optics - Abstract
The focusing quality of high peak power lasers plays a crucial role in laser wakefield electron acceleration investigations. We report here an improvement in the focusing quality of the SULF-1PW laser beamline, planning to drive and generate 5~10 GeV electron beams. After the wavefront correction in vacuum with an adaptive optical system and the focusing with an f/56 off-axis parabolic mirror, near-diffraction-limited focal spots with a size of 52 × 54 μm2 at full width at half maximum are achieved, and the enclosed energy inside this size is ~36.6%. Consequently, the focused intensity of ~1.66 × 1019 W/cm2 can be achieved at 1 PW peak power. Moreover, we also examine the wavefront stability in air and vacuum, respectively. From the statistical analysis of 1900 shots of successive laser pulses at 1 Hz, we identify the wavefront fluctuation resulting from air turbulence and the better correction capacity in vacuum. This work demonstrates the importance and necessity of wavefront correction in vacuum for high peak power lasers.
- Published
- 2022
33. Few-cycle mid-infrared laser based on nonlinear self-compression in solid thin plates
- Author
-
Beijie Shao, Yujie Peng, Liya Shen, Yanyan Li, Ruxin Li, Junyu Qian, Feng Renyu, Zhe Liu, Wenkai Li, and Yuxin Leng
- Subjects
Materials science ,business.industry ,Nonlinear optics ,Laser ,Atomic and Molecular Physics, and Optics ,law.invention ,Wavelength ,Optics ,Modulation ,law ,Dispersion (optics) ,Chirp ,business ,Self-phase modulation ,Photonic-crystal fiber - Abstract
A few-cycle mid-infrared (MIR) laser is demonstrated via nonlinear self-compression in solid thin plates. In this novel solution, the anomalous material dispersion in the MIR band and the chirp induced by self-phase modulation are mutually compensated, which can achieve self-compression. Finally, with the 4 µm laser injection with 4.8 mJ/155 fs and few-cycle pulses with 3.44 mJ, 29.4 fs are generated with a high efficiency of 71.7%, and the system maintains very good spectral stability in 10 days. Compared with other post-compression methods, this self-compression technique has the advantages of high efficiency and robust and large energy expansion scale, which can be further extended to MIR lasers with other wavelengths and higher peak power.
- Published
- 2021
34. 1 μm few-cycle pulse generation in a single-stage gas-filled hollow core fiber
- Author
-
Renyu Feng, Yujie Peng, Yanyan Li, Wenkai Li, Junyu Qian, Liya Shen, Yuxin Leng, and Ruxin Li
- Subjects
Electrical and Electronic Engineering ,Atomic and Molecular Physics, and Optics ,Electronic, Optical and Magnetic Materials - Published
- 2022
35. Suppressing scattering-induced nanosecond pre-pulses in Ti:sapphire multi-pass amplifiers
- Author
-
Xinliang Wang, Peile Bai, Yanqi Liu, Hui Zhang, Yunhai Tang, Xiaobin Wang, Xiaobo Zhang, Chao Fan, Bo Yao, Yijie Sun, Fenxiang Wu, Zongxin Zhang, Zebiao Gan, Lianghong Yu, Cheng Wang, Xiaoming Lu, Yi Xu, Xiaoyan Liang, and Yuxin Leng
- Subjects
Atomic and Molecular Physics, and Optics - Abstract
In this Letter, we experimentally investigate a new kind of nanosecond pre-pulse, which originates from the bidirectional scattering of crystals in traditional Ti:sapphire multi-pass amplifiers. The experimental results demonstrate that the intensity of scattering-induced pre-pulses is very sensitive to the scattering angle, and the delay time between the pre-pulse and the main pulse is an integer multiple of the light path in each pass of the amplifier. An optimized multi-pass amplifier configuration is proposed, for what is believed to be the first time, to suppress the scattering-induced pre-pulses. The contrast ratio between pre-pulses and the main pulse is enhanced by more than two orders of magnitude, reaching a level of 10−10. This novel multi-pass amplifier configuration is very simple and economical, and provides an effective solution for the temporal contrast enhancement in the nanosecond range.
- Published
- 2022
36. High-order harmonic generation in an x-ray range from laser-induced multivalent ions of noble gas
- Author
-
Jixing Gao, Jiaqi Wu, Zhiyuan Lou, Fan Yang, Junyu Qian, Yujie Peng, Yuxin Leng, Yinghui Zheng, Zhinan Zeng, and Ruxin Li
- Subjects
Atomic and Molecular Physics, and Optics ,Electronic, Optical and Magnetic Materials - Abstract
Tabletop coherent x-ray sources extending to multi-keV or higher photon energies have versatile applications, including in 4D imaging and semiconductor detectors. However, these sources can be realized only via high-order harmonic generation (HHG) with an ∼ 10 µ m laser interacting with neutral atoms. As shown in previous work by Popmintchev et al. [Science 350, 1225 (2015)10.1126/science.aac9755SCIEAS0036-8075], multiply ionized plasmas can efficiently produce hundred-eV harmonics with an ultraviolet laser. Here, we experimentally investigate multi-keV x-ray sources up to ∼ 5.2 k e V , the highest photon energy generated via HHG to date, to our knowledge, using a 1.45-µm driving laser that interacts with multivalent ions. Both the angular distribution and the ellipticity dependence of the signal are strong evidence of the HHG mechanism.
- Published
- 2022
37. Growth, thermal conductivity, spectra, and 2 µm continuous-wave characteristics of Tm3+, Ho3+ co-doped LaF3 crystal
- Author
-
Mingzhu He, Chun Li, Lianhan Zhang, Peixiong Zhang, Zhenqiang Chen, Min Xu, Shulong Zhang, Yin Hang, Yuxin Leng, Shanming Li, Guangzhu Chen, and Yilun Yang
- Subjects
Materials science ,Slope efficiency ,Biophysics ,Analytical chemistry ,02 engineering and technology ,General Chemistry ,010402 general chemistry ,021001 nanoscience & nanotechnology ,Condensed Matter Physics ,01 natural sciences ,Biochemistry ,Atomic and Molecular Physics, and Optics ,Spectral line ,0104 chemical sciences ,Pulsed laser deposition ,Crystal ,Thermal conductivity ,Absorption band ,Continuous wave ,0210 nano-technology ,Absorption (electromagnetic radiation) - Abstract
The Tm3+ and Ho3+ ions co-doped LaF3 crystal was grown successfully by the Bridgman method for the first time. X-ray diffraction, thermal conductivity, absorption, and fluorescence properties were investigated systematically. The thermal conductivity is 1.99 W/(mK) at room temperature. The absorption cross-section at 792 nm and emission cross-section at 1987 nm are 0.18 × 10 − 20 cm2 and 0.32 × 10 − 20 cm 2 , respectively. The Tm,Ho:LaF3 crystal exhibits wide absorption band (38 nm) and emission band (140 nm), as well as long fluorescence lifetime (17.56 ms). With a 10-mm-long sample, the output power of 574 mW at 2047 nm was obtained for the incident power of 3.53 W with a slope efficiency of 18.5%. It can be proposed that Tm,Ho:LaF3 crystal can be a potential material for LD-pumped tunable and ultra-short pulse laser applications operating at around 2 μ m .
- Published
- 2019
38. Spectral broadening of radially polarized pulses through a gas-filled hollow-core fiber
- Author
-
Ruxin Li, Lingling Qiao, Yuxin Leng, Ruirui Zhao, Ding Wang, and Yu Zhao
- Subjects
Hollow core ,Materials science ,business.industry ,Polarization (waves) ,01 natural sciences ,Atomic and Molecular Physics, and Optics ,Electronic, Optical and Magnetic Materials ,010309 optics ,Nonlinear system ,Broad spectrum ,Optics ,0103 physical sciences ,Spectral width ,Electrical and Electronic Engineering ,010306 general physics ,business ,Optical vortex ,Doppler broadening - Abstract
Spectral broadening of a radially polarized (RP) pulse in a gas-filled hollow-core fiber (HCF) is experimentally studied. Broad spectrum covering from 540 nm to 1070 nm is obtained. It is found that the output spectrum preserves the RP state after nonlinear propagation in HCF, both for the components in the input pulse and for the newly generated spectral portion. This method shows great potential in generating RP sources with unprecedented spectral width, and may also be extended to other kinds of cylindrical vector beams.
- Published
- 2019
39. Enhanced single-mode lasers of all-inorganic perovskite nanocube by localized surface plasmonic effect from Au nanoparticles
- Author
-
Zeyu Zhang, Liang Liu, Xiaosheng Tang, Fanju Zeng, Yao Yao, Juan Du, Zhiping Hu, Zhengzheng Liu, Zhigang Zang, Jie Yang, Yuxin Leng, Mingyu Pi, and Zhiqiang Yao
- Subjects
Materials science ,Active laser medium ,Photoluminescence ,business.industry ,Biophysics ,Nanoparticle ,02 engineering and technology ,General Chemistry ,010402 general chemistry ,021001 nanoscience & nanotechnology ,Condensed Matter Physics ,01 natural sciences ,Biochemistry ,Atomic and Molecular Physics, and Optics ,0104 chemical sciences ,Nanomaterials ,PEDOT:PSS ,Optoelectronics ,0210 nano-technology ,business ,Lasing threshold ,Plasmon ,Perovskite (structure) - Abstract
Miniaturized laser sources recently attracted considerable interests as their potential applications in optical communication, data storage, and imaging. However, high cavity losses induced by size reduction from the gain medium would lead high lasing threshold. In this work, the enhanced optical properties of CsPbBr3 perovskite nanocubes by using localized surface plasmonic effect of Au nanoparticles (NPs) were investigated. The integration of Au NPs in the poly (3, 4-ethylenedioxy-thiophene): poly (styrenesulfonate) PEDOT: PSS layer induces obviously enhancement both in the absorption and photoluminescence (PL) of CsPbBr3 perovskite nanocubes. Importantly, the lasing threshold of CsPbBr3 perovskite nanocubes is significantly reduced by ~ 33%. This study suggests that the lead halide perovskites hybridized with plasmonic nanomaterials would be promising candidates for laser devices and other optoelectronic devices with high efficiency.
- Published
- 2019
40. Temporal contrast enhancement via nonlinear elliptical polarization rotation in a solid thin plate
- Author
-
Jiajun Song, Liya Shen, Jianyu Sun, Yujie Peng, and Yuxin Leng
- Subjects
Atomic and Molecular Physics, and Optics - Abstract
We demonstrate the simultaneous temporal contrast enhancement and spectral broadening via nonlinear elliptical polarization rotation in a solid thin plate. The efficiency, temporal contrast enhancement, spectral broadening, pulse compression and power stability are experimentally investigated. With this simple and efficient scheme, the temporal cleaned pulses with energy of 325 µJ and total efficiency of 30% are obtained. The temporal contrast and spectral bandwidth of the filtered pulse are 1011 and 104 nm, respectively. The pulse compressed from 180 fs to 45.8 fs is realized by utilizing chirped mirrors, corresponding to a compression factor of 3.93. With stable output power, presented scheme could be implemented in the ultra-intense femtosecond laser facilities.
- Published
- 2022
41. Generation of 56.5 W femtosecond laser radiation by the combination of an Nd-doped picosecond amplifier and multi-pass-cell device
- Author
-
Jiajun Song, Liya Shen, Jianyu Sun, Zhaohua Wang, Zhiyi Wei, Yujie Peng, and Yuxin Leng
- Subjects
Atomic and Molecular Physics, and Optics - Abstract
We demonstrate the generation of high average power femtosecond laser radiation by combination of an Nd-doped picosecond amplifier and a multi-pass cell device. With this efficient and robust scheme, the pulse duration of a picosecond amplifier is compressed from 9.13 ps to 477 fs, corresponding to a compression factor of 19.1. The average power before and after pulse compression is 77 W and 56.5 W respectively, so the overall transmission reaches 73.4%. The presented scheme offers a viable route toward low-cost and simple configuration high power femtosecond lasers driven by Nd-doped picosecond amplifiers.
- Published
- 2022
42. Effect of the interface on femtosecond laser damage of a metal-dielectric low dispersion mirror
- Author
-
Yunxia Jin, Kui Yi, Jiaoling Zhao, Yanzhi Wang, Hongbo He, Meiping Zhu, Zhihao Wang, Yuanan Zhao, Ruxin Li, Yuxin Leng, Ruiyi Chen, Jianda Shao, Dawei Li, and Yuhui Zhang
- Subjects
Materials science ,business.industry ,02 engineering and technology ,Dielectric ,Adhesion ,021001 nanoscience & nanotechnology ,Laser ,01 natural sciences ,Atomic and Molecular Physics, and Optics ,law.invention ,010309 optics ,Stress (mechanics) ,Optics ,Residual stress ,law ,0103 physical sciences ,Femtosecond ,Dispersion (optics) ,Optoelectronics ,Thin film ,0210 nano-technology ,business - Abstract
Metal-dielectric low dispersion mirrors (MLDM) have a promising application prospect in petawatt (PW) laser systems. We studied the damage characteristics of MLDM and found that the damage source of MLDM (Ag + Al2O3+SiO2) is located at the metal-dielectric interface. We present the effect of the interface on the femtosecond laser damage of MLDM. Finite element analysis shows that thermal stress is distributed at the interface, causing stress damage which is consistent with the damage morphology. After enhancing the interface adhesion and reducing the residual stress, the damage source transfers from the interface to a surface SiO2 layer, and the damage threshold can be increased from 0.60 J/cm2 to 0.73 J/cm2. This work contributes to the search for new techniques to improve the damage threshold of MLDM used in PW laser systems.
- Published
- 2021
43. High-energy, high-repetition-rate ultraviolet pulses from an efficiency-enhanced, frequency-tripled laser
- Author
-
Yuanan Zhao, Wang Wenyu, Xinlin Lu, Yuxin Leng, Xiangyu Zhu, and Yujie Peng
- Subjects
Nuclear and High Energy Physics ,High energy ,Materials science ,02 engineering and technology ,medicine.disease_cause ,01 natural sciences ,law.invention ,010309 optics ,Root mean square ,law ,0103 physical sciences ,medicine ,business.industry ,Amplifier ,Energy conversion efficiency ,021001 nanoscience & nanotechnology ,Laser ,Atomic and Molecular Physics, and Optics ,Electronic, Optical and Magnetic Materials ,Nuclear Energy and Engineering ,Energy stability ,Picosecond ,Optoelectronics ,0210 nano-technology ,business ,Ultraviolet - Abstract
In this study, a high-energy, temporally shaped picosecond ultraviolet (UV) laser running at 100 Hz is demonstrated, with its pulses boosted to 120 mJ by cascaded regenerative and double-pass amplifiers, resulting in a gain of more than 108. With precise manipulation and optimization, the amplified laser pulses were flat-top in the temporal and spatial domains to maintain high filling factors, which significantly improved the conversion efficiency of the subsequent third harmonic generation (THG). Finally, 91 mJ, 470 ps pulses were obtained at 355 nm, corresponding to a conversion efficiency as high as 76%, which, as far as we are aware of, is the highest THG efficiency for a high-repetition-rate picosecond laser. In addition, the energy stability of the UV laser is better than 1.07% (root mean square), which makes this laser an attractive source for a variety of fields including laser conditioning and micro-fabrication.
- Published
- 2021
44. Use of double-grating Offner stretcher for dispersion control in petawatt level optical parametric chirped pulse amplification systems
- Author
-
Fenxiang Wu, Xingyan Liu, Xinliang Wang, Jiabing Hu, Xiaoming Lu, Yanyan Li, Yujie Peng, Yanqi Liu, Junchi Chen, Yingbin Long, Wenkai Li, Zongxin Zhang, Yi Xu, Cheng Wang, Yuxin Leng, and Ruxin Li
- Subjects
Electrical and Electronic Engineering ,Atomic and Molecular Physics, and Optics ,Electronic, Optical and Magnetic Materials - Published
- 2022
45. Full-aperture chirped-pulse grating compression with a non-uniform beam
- Author
-
Ding Wang, Yuxin Leng, Cheng Wang, and Yi Xu
- Subjects
Optics ,Materials science ,Aperture ,business.industry ,Compression (functional analysis) ,Non uniform beam ,Electrical and Electronic Engineering ,Physical and Theoretical Chemistry ,Grating ,business ,Atomic and Molecular Physics, and Optics ,Electronic, Optical and Magnetic Materials ,Pulse (physics) - Published
- 2022
46. Surface ligand modified cesium lead bromide/silica sphere composites for low-threshold upconversion lasing
- Author
-
Qian Xiong, Sihao Huang, Zijun Zhan, Juan Du, Xiaosheng Tang, Zhiping Hu, Zhengzheng Liu, Zeyu Zhang, Weiwei Chen, and Yuxin Leng
- Subjects
Atomic and Molecular Physics, and Optics ,Electronic, Optical and Magnetic Materials - Abstract
In recent years, all-inorganic halide perovskite quantum dots (QDs) have drawn attention as promising candidates for photodetectors, light-emitting diodes, and lasing applications. However, the sensitivity and instability of perovskite to moisture and heat seriously restrict their practical application to optoelectronic devices. Recently, a facile ligand-engineering strategy to suppress aggregation by replacing traditional long ligands oleylamine (OAm) during the hot injection process has been reported. Here, we further explore its thermal stability and the evolution of photoluminescence quantum yield (PLQY) under ambient environment. The modified CsPbBr 3 QDs film can maintain 33% of initial PL intensity, but only 17% is retained in the case of unmodified QDs after 10 h continuous heating. Further, the obtained QDs with higher initial PLQY (91.8%) can maintain PLQY to 39.9% after being continuously exposed in air for 100 days, while the PLQY of original QDs is reduced to 5.5%. Furthermore, after adhering CsPbBr 3 QDs on the surface of a micro SiO 2 sphere, we successfully achieve the highly-efficient upconversion random laser. In comparison with the unmodified CsPbBr 3 QDs, the laser from the modified CsPbBr 3 QDs presents a decreased threshold of 79.81 μJ / cm 2 and higher quality factor ( Q ) of 1312. This work may not only provide a facile strategy to synthesize CsPbBr 3 QDs with excellent photochemical properties but also a bright prospect for high-performance random lasers.
- Published
- 2022
47. A novel design of double chirped pulse amplification laser systems for fourth-order dispersion control
- Author
-
Peile Bai, Jiayi Qian, Gui Jiayan, Yuxin Leng, Yanqi Liu, Yi Xu, Cheng Wang, Jiabing Hu, Penghua Ji, Fenxiang Wu, Xingyan Liu, Zongxin Zhang, and Xiaojun Yang
- Subjects
Chirped pulse amplification ,Materials science ,business.industry ,Pulse duration ,02 engineering and technology ,021001 nanoscience & nanotechnology ,Laser ,01 natural sciences ,Atomic and Molecular Physics, and Optics ,Deformable mirror ,law.invention ,010309 optics ,Optics ,law ,0103 physical sciences ,Dispersion (optics) ,Femtosecond ,Spontaneous emission ,0210 nano-technology ,business ,Degradation (telecommunications) - Abstract
A novel design of double chirped pulse amplification laser systems implementing a combination of negatively and positively chirped pulse amplification is proposed for the first time. Without utilizing any extra dispersion compensation element, this design can sufficiently cancel out the second-, third- and especially fourth-order dispersion simultaneously, just by optimizing the parameters of the stretcher and compressor in first chirped pulse amplification stage which applies negatively chirped pulse amplification. The numerical results indicate that near Fourier-transform-limited pulse duration about 20fs can be achieved in high-peak-power femtosecond laser systems up to multi-Petawatt level. This design not only provides a feasible solution for the dispersion control in high-contrast and high-peak-power femtosecond laser systems, but also can avoid the degradation of temporal contrast induced by seed energy loss in the presence of additional dispersion compensation components.
- Published
- 2020
48. Laser ellipticity-dependent supercontinuum generation by femtosecond laser filamentation in air
- Author
-
Hao Guo, Yuxin Leng, Ruxin Li, Na Chen, Z.W. Zhu, Yaoxiang Liu, Haiyi Sun, Fukang Yin, and Tie-Jun Wang
- Subjects
Materials science ,business.industry ,Linear polarization ,Physics::Optics ,macromolecular substances ,02 engineering and technology ,Plasma ,021001 nanoscience & nanotechnology ,Laser ,01 natural sciences ,Atomic and Molecular Physics, and Optics ,Supercontinuum ,law.invention ,Quantitative Biology::Subcellular Processes ,010309 optics ,Optics ,Filamentation ,law ,0103 physical sciences ,Femtosecond ,Physics::Atomic Physics ,0210 nano-technology ,business ,Radiant intensity ,Circular polarization - Abstract
We experimentally investigate the laser polarization effect on the supercontinuum (SC) generation through femtosecond laser filamentation in air. By tuning filamenting laser ellipticity from linear polarization to circular polarization, the spectral intensity of the SC after filamentation gradually increases, while the spectral bandwidth of the SC continuously decreases. The laser ellipticity-dependent spectral intensity modulation of the SC is stronger at higher filamenting pulse energy. Laser energy deposits more in linearly polarized laser filaments than in circularly polarized laser filaments. The experimental results are supported by numerical simulations. A physical picture based on the laser ellipticity-dependent clamped intensity inside the filament, together with the Kerr nonlinearity and plasma related self-phase modulations, is proposed to explain the observation.
- Published
- 2020
49. Single-scan, dual-functional interferometer for fast spatiotemporal characterization of few-cycle pulses
- Author
-
Yuyun Zhao, Y. F. Chen, Jinxin Fu, Z.Z. Xu, Yuxin Leng, Ding Wang, Meng Pang, and Zhandong Huang
- Subjects
Phase (waves) ,FOS: Physical sciences ,Physics::Optics ,02 engineering and technology ,01 natural sciences ,law.invention ,010309 optics ,Optics ,Position (vector) ,law ,0103 physical sciences ,Astronomical interferometer ,Shearing (physics) ,Physics ,business.industry ,Astrophysics::Instrumentation and Methods for Astrophysics ,Michelson interferometer ,Laser science ,021001 nanoscience & nanotechnology ,Laser ,Atomic and Molecular Physics, and Optics ,Interferometry ,0210 nano-technology ,business ,Optics (physics.optics) ,Physics - Optics - Abstract
Accurate and fast characterization of spatio-temporal information of high-intensity, ultrashort pulses is crucial in the field of strong-field laser science and technology. While conventional self-referenced interferometers were widely used to retrieve the spatial profile of the relative spectral phase of pulses, additional measurements of temporal and spectral information at a particular position of the laser beam, however, were necessary to remove the indeterminacy, which increases the system complexity. Here we report an advanced, dual-functional interferometer that is able to reconstruct the complete spatio-temporal information of ultrashort pulses with a single scan of the interferometer arm. The setup integrates an interferometric frequency-resolved optical gating (FROG) with a radial shearing Michelson interferometer. Through scanning one arm of the interferometer, both the cross-correlated FROG trace at the central part of the laser beam and the delay-dependent interferograms of the entire laser profile are simultaneously obtained, allowing a fast three-dimensional reconstruction of few-cycle laser pulses.
- Published
- 2020
50. Direct measurement of radial fluence distribution inside a femtosecond laser filament core
- Author
-
Yaoxiang Liu, Haiyi Sun, Yuxin Leng, Na Chen, Tie-Jun Wang, Xuan Zhang, Hao Guo, Yunxia Jin, Ruxin Li, Baifei Shen, and Chengpu Liu
- Subjects
Diffraction ,Materials science ,Physics::Instrumentation and Detectors ,business.industry ,macromolecular substances ,02 engineering and technology ,021001 nanoscience & nanotechnology ,Laser ,01 natural sciences ,Fluence ,Atomic and Molecular Physics, and Optics ,law.invention ,Quantitative Biology::Subcellular Processes ,010309 optics ,Core (optical fiber) ,Protein filament ,Optics ,Filamentation ,law ,0103 physical sciences ,Femtosecond ,0210 nano-technology ,business ,Fresnel diffraction - Abstract
Modulation and direct measurement of the radial fluence distribution inside a single filament core (especially less than 100 μm in diameter) is crucial to filament-based applications. We report direct measurements of the radial fluence distribution inside a femtosecond laser filament core and its evolution via the filament-induced ablation method. The radial fluence distributions were modulated by manipulating the input pulse diffraction through an iris. Compared with using a traditionally circular iris, a stellate iris substantially suppressed the diffraction effect, and laser fluence, intensity and plasma density inside the filament core were considerably increased. The radial fluence inside filament cores was also quantitatively measured via the filament drilling diaphragms approach. Furthermore, numerical simulations were performed to support the experimental results by solving nonlinear Schrödinger equations. The effects of the tooth size of the stellate iris were numerically investigated, which indicated that bigger tooth favors higher fluence and longer filament. In addition to being beneficial in understanding the filamentation process and its control, the results of this study can also be valuable for filament-based applications.
- Published
- 2020
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