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超短脉冲高次谐波谱的连续性

陈基根1, 陈燕琴1, 黄文龙2, 杨玉军3   

  1. 1. 台州学院 物理系, 浙江 椒江 318000; 2. 吉林大学 物理学院, 长春 130012; 3. 吉林大学 原子与分子物理研究所, 长春 130012
  • 收稿日期:2007-09-15 修回日期:1900-01-01 出版日期:2008-09-26 发布日期:2008-09-26
  • 通讯作者: 杨玉军

Continuum Analysis of High\|order Harmonic Generation Spectrum by an Ultra-short Laser Pulse

CHEN Ji gen1, CHEN Yan qin1, HUANG Wen long2, YANG Yu jun3   

  1. 1. Department of Physics, Taizhou University, Jiaojiang 318000, Zhejiang Province, China; 2. College of Physics, Jilin University, Changchun 130012, China; 3. Institute of Atomic and Molecular Physics, Jilin University, Changchun 130012, China
  • Received:2007-09-15 Revised:1900-01-01 Online:2008-09-26 Published:2008-09-26
  • Contact: YANG Yu jun

摘要: 研究超短脉冲(3个光学周期)高次谐波发射功率谱的性状及其成因. 结果表明, 短脉冲谐波谱与长脉冲(10个光学周期)相比, 其平台区末端的谐波谱变得伪连续. 这是由于3个原因导致该现象: (1) 在短脉冲情形下, 谐波的生成仅经历1~2次辐射, 在长脉冲情形下, 谐波的生成经历多次辐射的累加; (2) 对于相同的谐波级次, 短脉冲比长脉冲的谐波线宽宽; (3) 短脉冲比长脉冲的激光频谱宽. 

关键词: 高次谐波, 小波变换, 短脉冲激光

Abstract: We investigated the high\|order harmonic generation (HHG) power spectrum by means of an ultra\|short laser pulse. Our numerical results show that the harmonics at the end of the plateau of HHG spectrum become successive compared with that of HHG spectrum by a long laser pulse. Three primary reasons cause this character: firstly, in the former, one or two irradiations contribute to the harmonic generation, while in the latter, the multi\|cycle accumulation of the harmonic generation causes separate sharp peaks; secondly, for the same HHG, the band width of the power spectrum of the former is wider than that of the latter; finally, the frequency spectrum of the short laser pulse is broader than that of the long laser pulse.

Key words: high-order harmonic generation, wavelet transform, ultra-short laser pulse

中图分类号: 

  • O562.1