Generating optical supercontinuum and frequency comb in tenuous plasmas  

作　　者：Kenan Qu Nathaniel J.Fisch 

机构地区：[1]Department of Astrophysical Sciences,Princeton University,Princeton,New Jersey 08544,USA

出　　处：《Matter and Radiation at Extremes》2021年第5期13-22,共10页极端条件下的物质与辐射（英文）

基　　金：supported by NNSA Grant No.DE-NA0002948。

摘　　要：There are several mechanisms by which the frequency spectrum of a laser broadens when it propagates at near-relativistic intensity in a tenuous plasma.Focusing on one-dimensional effects,we identify two strong optical nonlinearities,namely,four-wave mixing(FWM)and forward Raman scattering(FRS),for creating octave-wide spectra.FWM dominates the interaction when the laser pulse is short and intense,and its combination with phase modulation produces a symmetrically broadened supercontinuum.FRS dominates when the laser pulse is long and relatively weak,and it broadens the laser spectrum mainly toward lower frequencies and produces a frequency comb.The frequency chirping combined with group velocity dispersion compresses the laser pulse,causing higher peak intensity.

关 键 词：OPTICAL SPECTRA SCATTERING 

分 类 号：TN24[电子电信—物理电子学]