Observation of Raman scattering and hard X-rays in short pulse laser interaction with high density hydrogen gas

被引：17

作者：

Wang, XF ^{[1
]}

Fedosejevs, R ^{[1
]}

Tsakiris, GD ^{[1
]}

机构：

[1] Max Planck Inst Quantenopt, D-85746 Garching, Germany

来源：

OPTICS COMMUNICATIONS | 1998年 / 146卷 / 1-6期

基金：

欧盟地平线“2020”;

关键词：

plasma; Raman scattering; TW femtosecond laser; hard X-rays;

D O I：

10.1016/S0030-4018(97)00479-3

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

Backward and forward Raman scattering has been experimentally investigated in a high density hydrogen gas jet target at electron densities up to 0.2n(c), well above the density of previously reported studies. Stokes shifted radiation from both backward and forward scattering is observed with a peak wavelength which is consistent with the frequency matching condition for a cold plasma. Strong up-shifted spectra are observed in the forward direction which cannot be simply attributed to anti-Stokes shifted Raman light. Hard X-ray emission is also observed and its onset together with a saturation in the backscatter signal coincide with the predicted threshold for relativistic self-focusing of the laser in the gas. The results also show a correlation between the generation of hard X-rays and the forward Raman scattering as the laser power is varied. (C) 1998 Elsevier Science B.V.

引用

页码：363 / 370

页数：8

共 39 条

[1] Anomalous absorption of very high-intensity laser pulses propagating through moderately dense plasma [J].