Plasma-induced frequency chirp of intense femtosecond lasers and its role in shaping high-order harmonic spectral lines

被引：31

作者：

Kim, JH ^{[1
]}

Nam, CH

机构：

[1] Korea Adv Inst Sci & Technol, Dept Phys, Taejon 305701, South Korea

[2] Korea Adv Inst Sci & Technol, Coherent Xray Res Ctr, Taejon 305701, South Korea

来源：

PHYSICAL REVIEW A | 2002年 / 65卷 / 03期

关键词：

D O I：

10.1103/PhysRevA.65.033801

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

We investigate the self-phase modulation of intense femtosecond laser pulses propagating in an ionizing gas and its effects on collective properties of high-order harmonics generated in the medium. Plasmas produced in the medium are shown to induce a positive frequency chirp on the leading edge of the propagating laser pulse, which subsequently drives high harmonics to become positively chirped. In certain parameter regimes, the plasma-induced positive chirp can help to generate sharply peaked high harmonics, by compensating for the dynamically induced negative chirp that is caused by the steep intensity profile of intense short laser pulses.

引用

页数：5

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