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分别改变饱和吸收体在激光腔内的位置及抽运光的束腰在激光晶体中的位置,实现了对激光二极管(LD)抽运Nd∶YVO4/KTP腔内倍频Cr4+∶YAG被动调Q绿光的脉宽控制。在抽运功率1.52 W的条件下,脉冲宽度可以控制在388~616 ns之间,同时获得了激光脉冲的重复频率、单脉冲能量及峰值功率的变化范围分别为4.4~26.3 kHz,0.52~4.19μJ和1.0~7.2 W。考虑腔内光子数密度的高斯空间分布以及抽运光的空间分布,给出了描述调Q激光器工作原理的耦合速率方程组,其数值解与实验结果相符。
Respectively changing the position of the saturable absorber in the laser cavity and the location of the beam waist of the pump light in the laser crystal, and realizing the passive Q (subscript x) QD conversion of LD: Nd: YVO4 / KTP Green pulse width control. Under the pumping power of 1.52 W, the pulse width can be controlled between 388 and 616 ns, and the repetition frequency of the laser pulse is obtained. The single pulse energy and peak power range from 4.4 to 26.3 kHz and from 0.52 to 4.19 μJ and 1.0 ~ 7.2 W. Considering the Gaussian spatial distribution of the photon density in the cavity and the spatial distribution of the pump light, a coupling velocity equation describing the working principle of the Q-switched laser is given. The numerical solution is consistent with the experimental results.