被动调Q自拉曼Nd∶GdVO4激光器

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。

Passively Q-Switched Nd∶GdVO4 Self-Raman Laser

In this paper, a laser-diode pumped passively Q-switched Nd∶GdVO4 self-Raman laser is studied theoretically and experimently in detail. In the experiment, by using Nd∶GdVO4 as the gain medium and Raman medium simultaneously, using two Cr4+∶YAG crystals with different initial transmissivity as the saturable absorber, respectively, the passively Q-switched operation of the self-Raman Nd∶GdVO4 laser at 1176 nm was investigated and compared. The average power, pulse energy, pulse width and pulse repetition rate of diode pumped passively Q-switched Nd∶GdVO4 self-Raman laser at 1176 nm with respect to the incident pump power were measured. The obtained maximum output average power is 244.6 mW with respect to incident power of 5.7 W and the corresponding conversion efficiency is 4.3% with initial transmissivity of 0.91. In the theoretical part, we used the rate equations to obtain the theoretical results. In the rate equations, the Gaussian distributions of the intracavity photon densities of the fundamental and Raman lasers and the initial population inversion density were taken into account. The obtained theoretical results were in agreement with the experimental results on the whole.