Enhanced high-order harmonic generation from excited argon

被引：13

作者：

Yuan, Xiaolong ^{[1
]}

Wei, Pengfei ^{[2
]}

Liu, Candong ^{[1
]}

Zeng, Zhinan ^{[1
]}

Zheng, Yinghui ^{[1
]}

Jiang, Jiaming ^{[1
]}

Ge, Xiaochun ^{[1
]}

Li, Ruxin ^{[1
]}

机构：

[1] Chinese Acad Sci, Shanghai Inst Opt & Fine Mech, State Key Lab High Field Laser Phys, Shanghai 201800, Peoples R China

[2] Shaoxing Univ, Dept Phys, Shaoxing 312000, Peoples R China

来源：

APPLIED PHYSICS LETTERS | 2015年 / 107卷 / 04期

基金：

中国国家自然科学基金;

关键词：

COHERENT SUPERPOSITION; ATTOSECOND PULSES; STATES; IONIZATION; ELECTRONS; EMISSION; REGIME; LASERS;

D O I：

10.1063/1.4927662

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

We experimentally demonstrate an effective scheme to generate the enhanced high-order harmonics from a coherent superposition state of ground state and excited states in Argon. By controlling the time delay between the pump and probe laser pulses, a surprising enhancement plateau of high-order harmonic generation is observed, with a half lifetime of dozens of picoseconds. In the plateau, the harmonic intensity is enhanced by nearly one order of magnitude compared to the case without pre-excitation. Moreover, the gradual enhancement process is also presented when the pump intensity is increasing for improving the population of excited states, which can be attributed to the Rydberg states created by frustrated tunneling ionization. (C) 2015 AIP Publishing LLC.

引用

页数：5

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