利用不同介质进行布里渊放大的研究

Study on Brillouin amplification in different liquid media

研究了受激布里渊散射振_放双池系统中振荡池和放大池选用不同种类介质的情况 .理论分析结果表明 ,当两种介质的布里渊频移接近 ,布里渊线宽有交叉时 ,系统仍具有放大作用 .采用CCl4 作为放大池介质 ,CCl4 CS2 的混合介质作为振荡池介质 ,利用Nd :YAG调Q激光研究了布里渊频移的偏离对布里渊放大的影响 ,结果表明 ,当布里渊频移的偏离较小时 ,其种子光放大率和种子光脉宽压缩率仍然很大 .采用CS2 作为放大池介质 ,苯作为振荡池介质 ,对振 放双池系统进行了实验研究 ,其种子光放大率达到 4 4 ,种子光脉宽压缩率为 7 2 ,相位共轭保真度为98% ,种子光放大率的稳定度小于 3% .

The two-cell stimulated Brillouin scattering ( SBS) system that uses different media in generator and amplifier cells is investigated. It is demonstrated that the seed light still has enough amplification when the Brillouin frequency shifts of this two media are near and their Brillouin line-widths are crossed. In experiment, when CCl4 is used as an amplifying medium and liquid mixture of CCl4/CS2 as generating medium, and the two-cell SBS system is pumped by Nd:YAG Q-switched laser, the influence of the deviation of Brillouin frequency shift on seed light Brillouin amplification is studied. The result shows that amplification efficiency and pulse compression ratio are still large enough when Brillouin frequency deviation is small. Moreover, under the condition of CS2 as the amplifying medium and benzene as the generating medium, seed light amplification efficiency of 4.4, pulse compression ratio of 7.2, phase-conjugation fidelity of 98%, and stability of seed light amplification efficiency of <3% are obtained.