啁啾波形调控产生水窗区间光谱连续区和阿秒脉冲

量子电子学报 ›› 2020, Vol. 37 ›› Issue (2): 150-156.

啁啾波形调控产生水窗区间光谱连续区和阿秒脉冲

刘航1, 冯立强2*

1辽宁工业大学化学与环境工程学院，辽宁锦州 121001； 2 辽宁工业大学理学院，辽宁锦州 121001

收稿日期:2019-08-11 修回日期:2019-09-03 出版日期:2020-03-28 发布日期:2020-03-28
通讯作者: 冯立强 E-mail:lqfeng1101@126.com
作者简介:刘航 (1985-)，博士，副教授，主要从事强激光场中电子动力学行为的理论研究。E-mail: liuhang20@126.com
基金资助:
Supported by National Nature Science Foundation of China（国家自然科学基金，11504151)，Natural Science Foundation of Liaoning Province (辽宁省自然科学基金，2019-MS-167)，Basic Research Foundation of Liaoning Provincial Education Department (辽宁省教育厅基础研究项目)

Chirp waveform control for producing water window spectral continuum and attosecond pulse

LIU Hang1, FENG Liqiang2*

1 School of Chemical and Environmental Engineering, Liaoning University of Technology, Jinzhou 121001, China; 2 College of Science, Liaoning University of Technology, Liaoning University of Technology, Jinzhou 121001, China

Received:2019-08-11 Revised:2019-09-03 Published:2020-03-28 Online:2020-03-28

摘要/Abstract

摘要： 为了获得能量范围在水窗区间的高强度光谱连续区，提出了一种利用啁啾调频场调控激光波形，进而实现高强度水窗区间光谱连续区的方法。研究发现：在单色多周期负向啁啾调频场驱动下，谐波截止能量可以得到延伸。当引入第二束负向啁啾激光场时，不仅谐波截止能量延伸到水窗区间，而且谐波辐射强度有近3个数量级的提高。当引入第三束123 nm紫外激光场时，在紫外共振电离的影响下，谐波辐射强度进一步增强。谐波强度增强与第三束激光场啁啾参数和激光相位几乎无关。最后，通过叠加水窗区间光谱的谐波可获得脉宽为38 as的单个阿秒脉冲。

关键词: 激光物理, 高次谐波, 啁啾激光, 单个阿秒脉冲

Abstract: In order to obtain high-intensity water window spectral continuum, a method to control the laser waveform by using frequency-chirp field and to obtain the water window spectral continuum is proposed. It is found that the harmonic cutoff can be extended in the presence of single-color multi-cycle negative chirped pulse. With the introduction of the second negative chirped pulse, not only the harmonic cutoff can be extended to the water window region, but also the harmonic yield can be enhanced by nearly three orders of magnitudes. When the third 123 nm ultraviolet pulse is added, the harmonic yield can be further improved due to ultraviolet resonance ionization, and the enhancement of harmonic yield is nearly independent of the chirp and laser phase of the third pulse. Finally, with the superposition of the harmonics on the water window spectral continuum, a 38 as pulse can be obtained.

Key words: laser physics, high-order harmonic generation, chirped laser, single attosecond pulse

中图分类号:

O562.4

刘航, 冯立强. 啁啾波形调控产生水窗区间光谱连续区和阿秒脉冲[J]. 量子电子学报, 2020, 37(2): 150-156.

LIU Hang, FENG Liqiang. Chirp waveform control for producing water window spectral continuum and attosecond pulse[J]. Chinese Journal of Quantum Electronics, 2020, 37(2): 150-156.

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