利用频带色散法,让宽线宽、多横模电光调Q Cr:LiSAF激光输出脉冲经过多个色散棱镜,频带被色散后,再聚焦到装有CS2散射介质的池中,产生后向受激布里渊散射,脉宽的压缩率较大,约为5倍.与无色散棱镜情况相比,阈值能量有所降低,并能很有效地改善抽运激光的光束质量.

With a broadband mutilmode electro optically Q switched Cr:LiSAF laser pulse passing through several dispersion prisms, its frequency band is dispersed. Then by focuing it into CS 2 cell the backward stimulated Brillouin scattering is produced. Experimental results show that in comparison with case of no-dispersing prism frequency band dispersing method can efficiently reduce the broadband SBS energy threshold, raise pulsewidth compression ratio by more than 5 times, and improve beam quality of pump light.