利用不同介质进行布里渊放大的研究

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%. 关键词： 受激布里渊散射 布里渊放大 布里渊频移 布里渊线宽

Study on Brillouin amplification in different liquid media

The two_cell stimulated Brillouin scattering (SBS) system that uses different me dia in generator and amplifier cells is investigated. It is demonst rated that the seed light still has enough amplification when the Brillouin freq uency shifts of this two media are near and their Brillouin line_widths are cros sed. In experiment, when CCl 4 is used as an amplifying medium and liquid mixture of CCl 4/CS 2 as generating medium, and the two_cell SBS system is pumped by Nd:YAG Q-switched laser, the influence of the deviation of Brillo uin frequency shift on s eed light Brillouin amplification is studied. The result shows that amplificatio n efficiency and pulse compression ratio are still large enough when Brillouin f requency deviation is small. Moreover, under the condition of CS 2 as the ampl ifying medium and benzene as the generating medium, seed light amplification eff iciency of 4.4, pulse compression ratio of 7.2, phase_conjugation fidelity of 98%, and st ability of seed light amplification efficiency of <3% are obtained.