受激布里渊散射Stokes脉冲展宽现象抑制研究

Stokes Duration Broadening Suppressing in the Process of Stimulated Brillouin Scattering Compression

针对高泵浦强度下受激布里渊散射(stimulated brillouin scattering,SBS)脉宽压缩过程中出现的Stokes展宽现象,提出了一种抑制展宽、提高压缩率的新方法——驻波驱动SBS压缩结构。此方法以驻波驱动声波场代替传统的噪声起振,加强声波场的同时,固定Stokes产生位置,从根源上抑制了Stokes光展宽现象。通过对照试验,证实了该方法的有效性,抑制Stokes展宽的同时获得了亚声子寿命输出。

In order to solve the phenomenon of Stokes duration broadening in the process of stimulated Brillouin scattering (SBS) compression, a new interferometric scheme is proposed. For interferometric scheme, the medium density modulation excited by a fixed standing-wave instant of acoustic noise, which fixes generation position of Stokes and solves the problem fundamentally. It is shown theoretically and confirmed experimentally that interfero? metric scheme can suppress the broadening effectively and obtain sub-phonon lifetime compression.