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为了研究LD抽运的被动调Q Nd:YAG/GdVO_4内腔式喇曼激光器的输出特性,采用Nd:YAG作为激光介质,GdVO_4晶体作为喇曼介质,分别用两块不同初始透过率的Cr~(4+):YAG晶体,得到并比较了采用不同初始透过率的Cr~(4+):YAG晶体时被动调Q喇曼激光器的性能。测量了平均输出功率、脉冲宽度和脉冲重复率随抽运功率的变化关系。当Cr~(4+):YAG的初始透过率为91%、输入功率是5.2W时,得到的喇曼光的最高功率为150.6mW,相应的转换效率为2.9%。结果表明,通过数值求解基频光和喇曼光空间分布的速率方程并应用到被动调Q内腔式喇曼激光器,获得的理论结果与实验结果大致相符。
In order to study the output characteristics of LD tunable Q-switched Nd: YAG / GdVO_4 cavity Raman lasers, Nd: YAG laser was used as the laser medium and GdVO_4 as Raman medium. Two different initial transmittance Cr ~ (4 +): YAG crystals, the performances of passive Q-switched Raman lasers with Cr 4+: YAG crystals with different initial transmittance were obtained and compared. The relationship between average output power, pulse width and pulse repetition rate with the pumping power was measured. When the initial transmittance of Cr ~ (4 +): YAG is 91% and the input power is 5.2W, the maximum power of Raman light obtained is 150.6mW and the corresponding conversion efficiency is 2.9%. The results show that the theoretical results obtained are roughly in agreement with the experimental results by numerically solving the rate equations of the fundamental and Raman light spatial distributions and applying them to passive Q-switched Raman lasers.