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Fourier-Limited Attosecond Pulse from High Harmonic GenerationAssistedbyUlitrafast MagneticFields

Ultrafast Science 2023年第5期3卷 51-59页

作者： Rodrigo Martin-Hernandez Hongtao Hu andrius baltuska Luis Plaja Carlos Hernandez-Garcia'I Grupo de Investigacion en Aplicaciones del Lasery Fotonica Departamento de Fisica AplicadaUniversidad de SalamancaE-37008 SalamancaSpain Photonics Institute Technische Universitat WienA-1040 ViennaAustria

One of the main constraints for reducing the temporal duration of attosecond pulses is the attochirp inherent to the process of high-order harmonic generation(HHG).Though the attochirp can be compensated in the extreme-ultraviolet using dispersive materials,this is unfeasible toward x-rays,where the shortest attosecond or even sub-attosecond pulses could be *** theoretically demonstrate that HHG driven by a circularly polarized infrared pulse while assisted by an strong oscillating ultrafast intense magnetic field enables the generation of few-cycle Fourier-limited few attosecond *** such a novel scenario,the magnetic field transversally confines the ionized electron during the HHG process,analogously to a nanowire *** the electron is ionized,the transverse electron dynamics is excited by the magnetic field,acting as a high-energy reservoir to be released in the form of phase-locked spectrally wide high-frequency harmonic radiation during the electron recollision with the parent *** addition,the transverse breathing dynamics of the electron wavepacket,introduced by the magnetic trapping,strongly modulates the recollision efficiency of the electronic trajectories,thus the attosecond pulse *** aftermath is the possibility of producing high-frequency(hundreds of eV)attosecond isolated few-cycle pulses,almost Fourier *** isolated intense magnetic fields considered in our simulations,of tens of kT,can be produced in finite spatial volumes considering structured beams or stationary configurations of counter-propagating state-of-the-art multi-terawatt/petawatt lasers.

关键词： harmonic trapping intense

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Channel-resolved subcycle interferences of electron wave packets emitted from H_(2) in two-color laser fields

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High Power Laser Science and Engineering 2016年第4期4卷 1-7页

作者： Xinhua Xie Stefan Roither Daniil Kartashov Li Zhang andrius baltuska Markus Kitzler Photonics Institute Technische Universitat Wien Institute of Theoretical Chemistry University of Vienna

We report on the observation of subcycle interferences of electron wave packets released during strong field ionization of H_2 with cycle-shaped two-color laser fields. With a reaction microscope we measure three-dimensional momentum distributions of photoelectrons correlated with either H_2^+ or protons within different energy ranges generated by dissociation of H_2^+. We refer to these different types of photoelectrons as channels. Our results show that the subcycle interference structures of electron wave packets are very sensitive to the cycle shape of the two-color laser field. We explain this behavior by the dependence of the ionization time within an optical cycle on the shape of the laser field cycle. The subcycle interference structures can be further used to obtain insight into the subcycle dynamics of molecules during strong field interaction.

关键词： molecular dynamics strong field ionization wave packet interference

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Solitary beam propagation in periodic layered Kerr media enables high-efficiency pulse compression and mode self-cleaning

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Light(Science & Applications) 2021年第4期10卷 464-474页

作者： Sheng Zhang Zongyuan Fu Bingbing Zhu Guangyu Fan Yudong Chen Shunjia Wang Yaxin Liu andrius baltuska Cheng Jin Chuanshan Tian Zhensheng Tao State Key Laboratory of Surface Physics and Department of Physics Fudan UniversityShanghaiChina institute of Photonics TU WienGusshausstrasse 27/387ViennaAustria Department of Applied Physics Nanjing University of Science and TechnologyNanjingJiangsu 210094China

Generating intense ultrashort pulses with high-quality spatial modes is crucial for ultrafast and strong-field science and can be achieved by nonlinear supercontinuum generation(SCG)and pulse *** this work,we propose that the generation of quasi-stationary solitons in periodic layered Kerr media can greatly enhance the nonlinear lightmatter interaction and fundamentally improve the performance of SCG and pulse compression in condensed *** both experimental and theoretical studies,we successfully identify these solitary modes and reveal their unified condition for ***-time coupling is shown to strongly influence the stability of solitons,leading to variations in the spectral,spatial and temporal profiles of femtosecond *** advantage of the unique characteristics of these solitary modes,we first demonstrate single-stage SCG and the compression of femtosecond pulses from 170 to 22 fs with an efficiency>85%.The high spatiotemporal quality of the compressed pulses is further confirmed by highharmonic *** also provide evidence of efficient mode self-cleaning,which suggests rich spatiotemporal self-organization of the laser beams in a nonlinear resonator This work offers a route towards highly efficient,simple,stable and highly flexible SCG and pulse compression solutions for state-of-the-art ytterbium laser technology.

关键词： pulse resonator mode

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基于非线性谐振腔的高效率脉冲压缩及其在高次谐波中的应用

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量子电子学报 2021年第1期38卷 124-125页

作者：张盛付宗源朱冰冰范广宇陈玉东王顺甲刘雅欣 andrius baltuska 金成田传山陶镇生应用表面物理国家重点实验室 Institute of Photonics TU Wien Institute of Photonics TUWien 南京理工大学理学院

产生具有高质量空间模式的高能量超短激光脉冲是超快和强场光学物理发展的关键技术。这通常可以通过非线性频谱展宽和脉冲压缩技术实现,而实现优质脉冲压缩的关键是控制高能量飞秒脉冲在Kerr非线性作用下达到稳定传播的条件。我们提出...

产生具有高质量空间模式的高能量超短激光脉冲是超快和强场光学物理发展的关键技术。这通常可以通过非线性频谱展宽和脉冲压缩技术实现,而实现优质脉冲压缩的关键是控制高能量飞秒脉冲在Kerr非线性作用下达到稳定传播的条件。我们提出在周期性排布的层状Kerr非线性介质中产生的空间光孤子状态可以为超连续谱产生和脉冲压缩提供一个优质的条件。

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