Soft-x-ray harmonic comb from relativistic electron spikes.
Soft-x-ray harmonic comb from relativistic electron spikes.
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DOI：
10.1103/physrevlett.108.135004
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发表时间：
2010-04
影响因子：
8.6
通讯作者：
A. Pirozhkov;M. Kando;T. Esirkepov;P. Gallegos;H. Ahmed;E. N. Ragozin;A. Faenov;T. Pikuz;T. Kawachi;A. Sagisaka;J. Koga;M. Coury;J. Green;P. Foster;C. Brenner;B. Dromey;D. Symes;M. Mori;K. Kawase;T. Kameshima;Y. Fukuda;L. Chen;I. Daito;K. Ogura;Y. Hayashi;H. Kotaki;H. Kiriyama;H. Okada;N. Nishimori;T. Imazono;K. Kondo;T. Kimura;T. Tajima;H. Daido;P. Rajeev;P. McKenna;M. Borghesi;D. Neely;Y. Kato;S. V. Bulanov
中科院分区：
文献类型：
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作者：
A. Pirozhkov;M. Kando;T. Esirkepov;P. Gallegos;H. Ahmed;E. N. Ragozin;A. Faenov;T. Pikuz;T. Kawachi;A. Sagisaka;J. Koga;M. Coury;J. Green;P. Foster;C. Brenner;B. Dromey;D. Symes;M. Mori;K. Kawase;T. Kameshima;Y. Fukuda;L. Chen;I. Daito;K. Ogura;Y. Hayashi;H. Kotaki;H. Kiriyama;H. Okada;N. Nishimori;T. Imazono;K. Kondo;T. Kimura;T. Tajima;H. Daido;P. Rajeev;P. McKenna;M. Borghesi;D. Neely;Y. Kato;S. V. Bulanov
我们证明了一种新的高次谐波产生机制，达到“水窗”光谱区的实验中，多太瓦飞秒激光照射气体射流。几百个谐波级被分辨出来，给出μJ/sr脉冲。在欠密等离子体中，相对论自聚焦激光产生的弓形波与腔边界处形成的振荡电子尖峰共同发射谐波。用突变理论解释了尖峰的尖锐性和稳定性。该机制得到了粒子模拟的证实。
We demonstrate a new high-order harmonic generation mechanism reaching the "water window" spectral region in experiments with multiterawatt femtosecond lasers irradiating gas jets. A few hundred harmonic orders are resolved, giving μJ/sr pulses. Harmonics are collectively emitted by an oscillating electron spike formed at the joint of the boundaries of a cavity and bow wave created by a relativistically self-focusing laser in underdense plasma. The spike sharpness and stability are explained by catastrophe theory. The mechanism is corroborated by particle-in-cell simulations.