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44 results on '"Mainz, Roland E."'

2. Parametric Waveform Synthesis: a scalable approach to generate sub-cycle optical transients

Author

Mainz, Roland E., Rossi, Giulio Maria, Scheiba, Fabian, Silva-Toledo, Miguel A., Cirmi, Giovanni, and Kärtner, Franz X.

Subjects
Physics - Optics
Abstract

The availability of electromagnetic pulses with controllable field waveform and extremely short duration, even below a single optical cycle, is imperative to fully harness strong-field processes and to gain insight into ultrafast light-driven mechanisms occurring in the attosecond time-domain. The recently demonstrated parametric waveform synthesis (PWS) introduces an energy-, power- and spectrum-scalable method to generate non-sinusoidal sub-cycle optical waveforms by coherently combining different phase-stable pulses attained via optical parametric amplifiers. Significant technological developments have been addressed to overcome the stability issues related to PWS and to obtain an effective and reliable waveform control system. Here we present the main ingredients enabling PWS technology. The design choices concerning the optical, mechanical and electronic setups are justified by analytical/numerical modeling and benchmarked by experimental observations. In its present incarnation, the PWS technology enables the generation of field-controllable mJ-level few-femtosecond pulses spanning the visible to infrared range., Comment: 34 pages

Published
2022
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3. Strong-field Coherent Control of Isolated Attosecond Pulse Generation

Author

Yang, Yudong, Mainz, Roland E., Rossi, Giulio Maria, Scheiba, Fabian, Silva-Toledo, Miguel A., Keathley, Phillip D., Cirmi, Giovanni, and Kärtner, Franz X.

Subjects
Physics - Optics, Physics - Applied Physics
Abstract

Attosecond science promises to reveal the most fundamental electronic dynamics occurring in matter and it can develop further by meeting two linked technological goals related to high-order harmonic sources: higher photon flux (permitting to measure low cross-section processes) and improved spectral tunability (allowing selectivity in addressing specific electronic transitions). New developments come through parametric waveform synthesis, which provides control over the shape of high-energy electric field transients, enabling the creation of highly-tunable isolated attosecond pulses via high-harmonic generation. Here we show that central energy, spectral bandwidth/shape and temporal duration of the attosecond pulses can be controlled by shaping the laser pulse waveform via two key parameters: the relative-phase between two halves of the multi-octave spanning optical spectrum, and the overall carrier-envelope phase. These results not only promise to expand the experimental possibilities in attosecond science, but also demonstrate coherent strong-field control of free-electron trajectories using tailored optical waveforms.

Published
2021
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4. Polarization-state-resolved high-harmonic spectroscopy of solids

Author

Klemke, Nicolai, Tancogne-Dejean, Nicolas, Rossi, Giulio M., Yang, Yudong, Mainz, Roland E., Di Sciacca, Giuseppe, Rubio, Angel, Kärtner, Franz X., and Mücke, Oliver D.

Subjects
Physics - Optics
Abstract

Attosecond metrology sensitive to sub-optical-cycle electronic and structural dynamics is opening up new avenues for ultrafast spectroscopy of condensed matter. Using intense lightwaves to precisely control the extremely fast carrier dynamics in crystals holds great promise for next-generation electronics and devices operating at petahertz bandwidth. The carrier dynamics can produce high-order harmonics of the driving light field extending up into the extreme-ultraviolet region. Here, we introduce polarization-state-resolved high-harmonic spectroscopy of solids, which provides deeper insights into both electronic and structural dynamics occuring within a single cycle of light. Performing high-harmonic generation measurements from silicon and quartz samples, we demonstrate that the polarization states of high-order harmonics emitted from solids are not only determined by crystal symmetries, but can be dynamically controlled, as a consequence of the intertwined interband and intraband electronic dynamics, responsible for the harmonic generation. We exploit this symmetry-dynamics duality to efficiently generate circularly polarized harmonics from elliptically polarized driver pulses. Our experimental results are supported by ab-initio simulations, providing clear evidence for the microscopic origin of the phenomenon. This spectroscopy technique might find important applications in future studies of novel quantum materials such as strongly correlated materials. Compact sources of bright circularly polarized harmonics in the extreme-ultraviolet regime will advance our tools for the spectroscopy of chiral systems, magnetic materials, and 2D materials with valley selectivity.

Published
2018
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6. Controlling water-window high-harmonic generation with sub-cycle synthesized waveforms

Author

Rossi Giulio Maria, Mainz Roland E., Scheiba Fabian, Silva-Toledo Miguel A., Kubullek Maximilian, and Kärtner Franz X.

Subjects
Physics, QC1-999
Abstract

We present the first results concerning synthesizer-driven high-harmonic generation that reach the water-window region. This approach holds the promise of offering greater spectral tunability in the generation of isolated attosecond pulses and at the same time of achieving higher photon-flux, required for attosecondresolved soft X-ray transient absorption experiments.

Published
2022
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7. A Near Fourier-Limited Pulse-Preserving Monochromator for Extreme-Ultraviolet Pulses in the Few-Fs Regime.

Author

Yang, Yudong, Neumann, Tanja, Hengster, Julia, Mainz, Roland E., Elsner, Jakob, Mücke, Oliver D., Kärtner, Franz X., and Uphues, Thorsten

Subjects
MONOCHROMATORS, FEMTOSECOND pulses
Abstract

We present a pulse-preserving multilayer-based extreme-ultraviolet (XUV) monochromator providing ultra-narrow bandwidth ( Δ E < 0.6 eV , E c = 92 eV ) and compact footprint ( 28 × 10 cm 2 ) for easy integration into high-harmonic generation (HHG) or free-electron laser (FEL) sources. The temporal resolution of the novel design supports pulse durations of typical pump–probe setups in the femtosecond and attosecond regime, depending on the mirror design and focusing geometries over the tuning range of the monochromator. The theoretical design is analyzed and experimentally characterized in a laser-driven HHG setup. [ABSTRACT FROM AUTHOR]

Published
2024
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9. Single-Shot CEP Change Detection in a Nanoantenna Network

Author

Ritzkowsky, Felix, primary, Yeung, Matthew, additional, Bebeti, Engjell, additional, Gebert, Thomas, additional, Matsuyama, Toru, additional, Rossi, Giulio M., additional, Mainz, Roland E., additional, Cankaya, Huseyin, additional, Keathley, Philip D., additional, and Kärtner, Franz X., additional

Published
2023
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12. Optical Waveform Synthesis and Its Applications

Author

Cirmi, Giovanni, primary, Mainz, Roland E., additional, Silva‐Toledo, Miguel A., additional, Scheiba, Fabian, additional, Çankaya, Hüseyin, additional, Kubullek, Maximilian, additional, Rossi, Giulio Maria, additional, and Kärtner, Franz X., additional

Published
2023
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16. Polarization states of high-harmonics generated in silicon from elliptical drivers

Author

Klemke Nicolai, Tancogne-Dejean Nicolas, Rossi Giulio M., Yang Yudong, Mainz Roland E., Di Sciacca Giuseppe, Rubio Angel, Kärtner Franz X., and Mücke Oliver D.

Subjects
Physics, QC1-999
Abstract

The polarization states of high-harmonics generated in silicon with elliptical excitation are studies. Circularly polarized harmonics are demonstrated with both circular and non-circular excitation, determined by crystal symmetry and the dynamical response of the system.

Published
2019
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17. Millijoule-level sub-cycle pulses from two channels of a parallel parametric waveform synthesizer

Author

Scheiba Fabian, Rossi Giulio Maria, Mainz Roland E., Yang Yudong, Cirmi Giovanni, and Kärtner Franz X.

Subjects
Physics, QC1-999
Abstract

We report on an optical synthesis of two compressed channels from our parametric waveform synthesizer, leading to a 0.6 mJ 3.4 fs pulse (3.2 fs transform limited) with a central wavelength of 1.8 /an, corresponding to 0.6 optical cycles.

Published
2019
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44. Passively CEP stable sub-2-cycle source in the mid-infrared by adiabatic difference frequency generation.

Author

Ritzkowsky F, Bebeti E, Rossi GM, Mainz RE, Suchowski H, Cankaya H, and Kärtner FX

Abstract

We report on the generation of a passive carrier-envelope phase (CEP) stable 1.7-cycle pulse in the mid-infrared by adiabatic difference frequency generation. With sole material-based compression, we achieve a sub-2-cycle 16-fs pulse at a center wavelength of 2.7 µm and measured a CEP stability of <190 mrad root mean square. The CEP stabilization performance of an adiabatic downconversion process is characterized for the first time, to the best of our knowledge.

Published
2023
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