调Q激光自锁模与脉冲峰值功率的输出不稳定性

从理论上解释了调Q钕玻璃,YAG激光器存在的模式自锁定现象所引起的调Q激光脉冲功率输出的不稳 定性。为了从根本上消除模式自锁定所引起的调Q激光脉冲波形的随机调制现象,实验采用预激光调Q与法布 里 珀罗(F P)标准具平板组合技术,获得了脉宽约为40ns,脉冲能量为85mJ的稳定调Q输出,其脉冲能量稳定度 和脉冲功率稳定度分别为±2%和±3%,激光输出的谱线宽度为6.9×10-4nm。单纵模输出几率达到89%。采 用上述方法,使自锁模式的调制现象得到有效地消除,从而使调Q激光器可以稳定地输出。

Model Target Existed in Q-Switched Laser and Instability of Output Pulse Power

In this paper, the instability of Q-switched laser pulse power output which was resulted from the phenomena of model target existed in Q-switched Nd-glass and YAG laser is reported. In order to dispel the phenomena of Q-switched laser waveform random modulation fundamentally, the pre-Q-switching and the Fabry-Perot (F-P) standard panel assemble were used, a steady Q-switched laser output in pulse width of 40 ns and pulse energy of 85 mJ was obtained. The stabilities of pulse energy and pulse power were ±2% and ±3%, respectively, line width was 6.9×10-4 nm, the probability of single longitudinal mode output was 89%. With above-mentioned method, the modulating phenomena of mode target was eliminated, the stable pulse power output of Q-switched Nd-glass laser was realized.