Shiyang Zhong 1Hao Teng 1,2,*Xiaoxian Zhu 1,3Yitan Gao 1,3[ ... ]Zhiyi Wei 1,2,3,***
Author Affiliations
1 Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
2 Songshan Lake Materials Laboratory, Dongguan 523808, China
3 University of Chinese Academy of Sciences, Beijing 100049, China
4 School of Physics and Optoelectronic Engineering, Xidian University, Xi’an 710071, China
Isolated attosecond pulses (IAPs) are generated via applying amplitude gating on high-order harmonic generation driven by carrier-envelope phase stabilized 5.2 fs pulses with 0.5 mJ pulse energy at 770 nm central wavelength at the Synergetic Extreme Condition User Facility. A continuum ranging from 70 to 100 eV that supports sub-100-attosecond pulse is extracted by Zr foil and Mo/Si multilayer mirror. We demonstrate the characterization of the IAP. The retrieved pulse duration is 86 attoseconds. The developed attosecond laser beamline with repetition rate up to 10 kHz is available for users to conduct attosecond photoelectron spectroscopy researches with a capability of coincidence measurement.
amplitude gating coincidence FROG-CRAB high-order harmonic generation isolated attosecond pulses 
Chinese Optics Letters
2023, 21(11): 113201
长春理工大学物理学院,吉林 长春 130022
利用强场近似理论开展了正交偏振双色场与氦原子相互作用产生高次谐波和阿秒脉冲的理论研究。正交偏振双色场由少周期的4 fs钛宝石驱动脉冲激光和与它偏振方向垂直的8 fs倍频控制脉冲构成。研究发现,通过合理选择两束脉冲之间的相对相位,能够控制高次谐波发射过程中长、短电子轨道的选择。当相对相位调整为1.2π时,平台谐波主要来自短轨道电子的贡献,由于其运动时间短、波包扩散少,且没有与长轨道电子谐波产生干涉,沿驱动脉冲电场方向的高次谐波谱具有较高强度和较小调制幅度的超连续平台区,通过对第120次到第180次超连续谐波进行傅里叶变换,可产生脉宽为54 as的高强度孤立阿秒脉冲。所提方案对组合脉冲相对相位的选取要求并不严苛,在0.3π的变化范围内皆可获得脉宽较短的孤立阿秒脉冲,同时控制脉冲电场强度的变化对上述数值模拟结果的影响也很小。
超快光学 高次谐波产生 阿秒脉冲 正交偏振双色场 电子轨道 ultrafast optics high-order harmonic generation attosecond pulse orthogonally polarized two-color field electron trajectory 
2023, 43(13): 1332001
Author Affiliations
1 Department of Physics, University of Gothenburg, Gothenburg, Sweden
2 Lawrence Berkeley National Laboratory, Berkeley, California, USA
3 Higgs Centre, School of Physics and Astronomy, University of Edinburgh, Edinburgh, UK
The availability of ever stronger, laser-generated electromagnetic fields underpins continuing progress in the study and application of nonlinear phenomena in basic physical systems, ranging from molecules and atoms to relativistic plasmas and quantum electrodynamics. This raises the question: how far will we be able to go with future lasers? One exciting prospect is the attainment of field strengths approaching the Schwinger critical field ${E}_{\mathrm{cr}}$ in the laboratory frame, such that the field invariant ${E}^2-{c}^2{B}^2>{E}_{\mathrm{cr}}^2$ is reached. The feasibility of doing so has been questioned, on the basis that cascade generation of dense electron–positron plasma would inevitably lead to absorption or screening of the incident light. Here we discuss the potential for future lasers to overcome such obstacles, by combining the concept of multiple colliding laser pulses with that of frequency upshifting via a tailored laser–plasma interaction. This compresses the electromagnetic field energy into a region of nanometre size and attosecond duration, which increases the field magnitude at fixed power but also suppresses pair cascades. Our results indicate that laser facilities with peak power of tens of PW could be capable of reaching ${E}_{\mathrm{cr}}$ . Such a scenario opens up prospects for the experimental investigation of phenomena previously considered to occur only in the most extreme environments in the universe.
Schwinger effect advanced focusing concepts attosecond pulses dipole wave surface high-order harmonic generation 
High Power Laser Science and Engineering
2023, 11(2): 02000e19
兰州城市学院电子工程学院,甘肃 兰州 730070
非线性光学 强场近似 分子的高次谐波 电离率 相对相位 阿秒脉冲 nonlinear optics strong field approximation molecular high-order harmonic generation ionization rate relative phase attosecond pulse 
2023, 50(5): 0508002
辽宁工业大学 理学院, 锦州 121001
为了输出具有高转化效率和高光子能量的谐波光谱, 采用求解薛定谔方程的方法, 理论研究了多色组合啁啾波形对谐波光谱的影响。结果表明, 在固定激光强度下, 最佳三色啁啾波形可以有效延伸谐波截止能量; 最佳四色啁啾波形可以增强谐波强度; 选择最佳三色和四色组合波形下的谐波光谱进行谐波叠加可获得42as的孤立阿秒脉冲。这一结果对超短阿秒脉冲的产生是有帮助。
激光光学 高次谐波 组合啁啾波形 阿秒脉冲 laser optics high-order harmonic generation combined chirp waveforms attosecond pulses 
2022, 46(6): 823
Author Affiliations
1 State Key Laboratory of High Field Laser Physics and CAS Center for Excellence in Ultra-intense Laser Science, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai, China
2 Department of Physics, Shanghai Normal University, Shanghai, China
Spatiotemporal optical vortex (STOV) pulses carrying purely transverse intrinsic orbital angular momentum (TOAM) are attracting increasing attention because the TOAM provides a new degree of freedom to characterize light–matter interactions. In this paper, using particle-in-cell simulations, we present spatiotemporal high-harmonic generation in the relativistic region, driven by an intense STOV beam impinging on a plasma target. It is shown that the plasma surface acts as a spatial–temporal-coupled relativistic oscillating mirror with various frequencies. The spatiotemporal features are satisfactorily transferred to the harmonics such that the TOAM scales with the harmonic order. Benefitting from the ultrahigh damage threshold of the plasma over the optical media, the intensity of the harmonics can reach the relativistic region. This study provides a new approach for generating intense spatiotemporal extreme ultraviolet vortices and investigating STOV light–matter interactions at relativistic intensities.
high-order harmonic generation relativistic laser–plasma interaction spatiotemporal optical vortex transverse orbital angular momentum 
High Power Laser Science and Engineering
2022, 10(6): 06000e46
1 吕梁学院物理系,山西 吕梁 033001
2 山西师范大学物理与信息工程学院,山西 临汾 041004
原子与分子物理学 高次谐波 受体掺杂半导体 含时薛定谔方程 atomic and molecular physics high-order harmonic generation acceptor-doped semiconductor time-dependent Schrödinger equation 
2022, 59(13): 1302001
延安大学 物理与电子信息学院,陕西 延安 716000
高次谐波 跃迁矩阵元 数值法 解析法 对称分子 不对称分子 High-order harmonic generation Transition matrix elements Numerical method Analytical method Symmetric molecules Asymmetric molecules 
2022, 51(3): 0302001
辽宁工业大学理学院, 辽宁 锦州 121001
为了增强高次谐波光谱强度, 提出了一种利用共振电离机制来提高谐波强度的方法。结果表明: 在 He 原子体系中, 受紫外共振电离影响, 谐波强度有 50 倍的增强。并且, 在啁啾场驱动下, 谐波截止能量也能增大, 进而获得一个高强度超宽谐波平台区。在 H2+ 分子体系中, 受电荷共振增强电离影响, 谐波强度也有近 20 倍的增强。并且在半周期单极场优化下, 该体系谐波截止能量也得到延伸, 进而获得一个只由单能量峰贡献的谐波平台区。进一步研究表明, 在两个体系的谐波平台区上选择一定的谐波叠加, 可分别获得脉宽在 36 as 和 32 as 的阿秒脉冲。初步的研究证实了所提出的方案有助于增强阿秒脉冲强度。
激光物理 高次谐波 孤立阿秒脉冲 紫外共振电离 电荷共振增强电离 laser physics high-order harmonic generation isolated attosecond pulse ultraviolet resonance ionization charge resonance enhanced ionization 
2021, 38(4): 529
北京大学 物理学院 人工微结构和介观物理国家重点实验室,北京100871
超快光学 涡旋光束 矢量光束 高次谐波 强场电离 Ultrafast optics Optical vortex beams Cylindrical vector beams High-order harmonic generation Strong-field ionization 
2021, 50(8): 0850209

关于本站 Cookie 的使用提示

中国光学期刊网使用基于 cookie 的技术来更好地为您提供各项服务,点击此处了解我们的隐私策略。 如您需继续使用本网站,请您授权我们使用本地 cookie 来保存部分信息。