Optimization of high-order harmonic brightness in the space and time domains
Optimization of high-order harmonic brightness in the space and time domains
复制标题
时空域高次谐波亮度优化
DOI：
10.1103/physreva.69.031805
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发表时间：
2004
影响因子：
2.9
通讯作者：
C. Nam
中科院分区：
文献类型：
--
作者：
H. T. Kim;I. J. Kim;Dong Gun Lee;K. Hong;Y. S. Lee;V. Tosa;C. Nam
Brightness of high-order harmonics is optimized in the space domain by profile flattening and self-guiding of intense femtosecond laser pulse and in the time domain by controlling the laser chirp. The profile flattening and self-guiding of the laser pulse propagating through a long gas jet effectively increased the phase-matched harmonic generation volume, thereby obtaining strong harmonics with low beam divergence, and the laser chirp control allowed the generation of spectrally sharp harmonics. At optimized conditions, the $61\text{st}$ harmonic, obtained at $134\phantom{\rule{0.3em}{0ex}}\mathrm{\AA{}}$ from Ne, had a brightness of about $1\ifmmode\times\else\texttimes\fi{}{10}^{15}\phantom{\rule{0.3em}{0ex}}\mathrm{W}∕{\text{cm}}^{2}∕\text{srad}$ with a beam divergence of 0.5 mrad and a spectral bandwidth of $0.7\phantom{\rule{0.3em}{0ex}}\mathrm{\AA{}}$.
Brightness of high-order harmonics is optimized in the space domain by profile flattening and self-guiding of intense femtosecond laser pulse and in the time domain by controlling the laser chirp. The profile flattening and self-guiding of the laser pulse propagating through a long gas jet effectively increased the phase-matched harmonic generation volume, thereby obtaining strong harmonics with low beam divergence, and the laser chirp control allowed the generation of spectrally sharp harmonics. At optimized conditions, the $61\text{st}$ harmonic, obtained at $134\phantom{\rule{0.3em}{0ex}}\mathrm{\AA{}}$ from Ne, had a brightness of about $1\ifmmode\times\else\texttimes\fi{}{10}^{15}\phantom{\rule{0.3em}{0ex}}\mathrm{W}∕{\text{cm}}^{2}∕\text{srad}$ with a beam divergence of 0.5 mrad and a spectral bandwidth of $0.7\phantom{\rule{0.3em}{0ex}}\mathrm{\AA{}}$.