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对激光二极管(LD)抽运的自拉曼Nd∶GdVO4被动调Q激光器进行了详细的理论和实验研究。实验中采用Nd∶GdVO4晶体同时作为激光介质和拉曼晶体,分别用了两块不同初始透射率的Cr4+∶YAG晶体,得到并比较了采用不同初始透射率的Cr4+∶YAG晶体时被动调Q自拉曼激光器的性能。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Cr4+∶YAG的初始透射率为0.91,输入功率是5.7 W时,得到的拉曼光的最高功率为244.6 mW,相应的转换效率为4.3%。通过数值求解基频光和拉曼光空间分布的速率方程并应用到被动调Q自拉曼Nd∶GdVO4激光器。获得的理论结果与实验结果大致相符。
The laser diode (LD) pumping self-Raman Nd:GdVO4 passive Q-switched laser was studied theoretically and experimentally in detail. Nd: GdVO4 crystal was used as both the laser medium and Raman crystal in the experiment. Two Cr4 +: YAG crystals with different initial transmittance were used respectively. The Q4 Raman laser performance. The relationship between average output power, pulse width and pulse repetition rate with the pumping power was measured. When the initial transmittance of Cr4 +: YAG is 0.91 and the input power is 5.7 W, the maximum power of Raman light obtained is 244.6 mW, and the corresponding conversion efficiency is 4.3%. The rate equations of the spatial distribution of fundamental and Raman light were numerically solved and applied to passive Q-switched Raman Nd: GdVO4 lasers. The theoretical results obtained are in good agreement with the experimental results.