Efficient soft x-ray high-order harmonic generation via dual-pulse driving lasers in the overdriven regime

被引：4

作者：

Shao, Renzhi ^{[1
,2
]}

Zhai, Chunyang ^{[3
]}

Zhang, Yinfu ^{[1
,2
]}

He, Lixin ^{[1
,2
]}

Zhu, Xiaosong ^{[1
,2
]}

Lan, Pengfei ^{[1
,2
]}

Lu, Peixiang ^{[1
,2
,4
]}

机构：

[1] Huazhong Univ Sci & Technol, Sch Phys, Wuhan 430074, Peoples R China

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

[3] Xinyang Normal Univ, Coll Phys & Elect Engn, Xinyang 464000, Peoples R China

[4] Wuhan Inst Technol, Hubei Key Lab Opt Informat & Pattern Recognit, Wuhan 430205, Peoples R China

来源：

JOURNAL OF PHYSICS B-ATOMIC MOLECULAR AND OPTICAL PHYSICS | 2021年 / 54卷 / 06期

基金：

中国国家自然科学基金;

关键词：

high-order harmonic generation; soft x-ray; overdriven regime; plasma effect;

D O I：

10.1088/1361-6455/abf297

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

We theoretically investigate the high-order harmonic generation (HHG) driven by dual-pulse lasers. The first pulse of 800 nm can create plasma in the high-density gas target. Then, the second pulse of 1800 nm is spatiotemporally reshaped by the plasma and generates soft x-ray high-order harmonics in the overdriven regime. The simulation results show that adding the first pulse can promote the phase matching of HHG in the cutoff region. As a result, a cutoff-extended HHG is achieved, which is one order of magnitude more intense than that in one pulse scheme reported previously. In dual-pulse driving lasers, the harmonic yield and the cutoff photon energy can be optimized effectively by increasing the gas pressure inside the water window region.

引用

页数：7

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