Relative strengths of sum and difference frequency generation in perturbative high harmonic wave mixing

被引：1

作者：

Wei, Zijuan ^{[1
,2
]}

Yan, Mingdong ^{[1
,2
]}

Xia, Fan ^{[1
,2
]}

Men, Ting ^{[1
,2
]}

Tang, Weiqi ^{[1
,2
]}

Yan, Weiwei ^{[1
,2
]}

Liu, Shiyuan ^{[1
,2
,3
,4
]}

Li, Zhengyan ^{[1
,2
,3
,4
]}

机构：

[1] Huazhong Univ Sci & Technol, Sch Opt & Elect Informat, Wuhan 430074, Peoples R China

[2] Huazhong Univ Sci & Technol, Wuhan Natl Lab Optoelect, Wuhan 430074, Peoples R China

[3] Opt Valley Lab, Wuhan 430074, Peoples R China

[4] Huazhong Univ Sci & Technol, Sch Mech Engn, Wuhan 430074, Peoples R China

来源：

JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS | 2024年 / 41卷 / 06期

基金：

中国国家自然科学基金;

关键词：

RADIATION; FIELD;

D O I：

10.1364/JOSAB.525386

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

High harmonic generation (HHG) modulated by a weak laser field allows the perturbative wave mixing process which involves sum and difference frequency generations (SFG and DFG). The relative strengths of SFG and DFG have been extensively discussed in the literature but are still ambiguous. Here we experimentally study the relative strengths between SFG and DFG channels by applying a frequency-offset second-harmonic perturbing laser field collinearly in a thin gaseous nonlinear medium. It shows that SFG is favored for low harmonic orders, but DFG dominates for high-energy photons, when only short trajectories of high harmonics are considered. A semi-classical model incorporating both modulations to the tunneling ionization and the electron propagation steps by the perturbing laser field for a train of attosecond pulses explains the experimental results. (c) 2024 Optica Publishing Group

引用

页码：1347 / 1354

页数：8

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