报道了激光二极管(LD)侧面抽运Nd:YAG晶体间歇振荡1064 nm和1319 nm双波长激光器。采用间歇振荡技术,可有效地控制上能级的反转粒子数,避免激光振荡谱线之间的双波长竞争效应,而且对输出镜镀膜精度的要求大大降低,稳定的间歇振荡双波长激光输出较容易获得。两声光间的延迟时间连续可调,因此可以通过调节延迟时间来改变双波长激光的输出功率之比。在抽运电流为22 A,声光重复频率为4 kHz,延迟时间为10 μs时获得1319 nm激光偏振输出功率6.2 W,1064 nm激光偏振输出功率5.1 W。根据间歇振荡双波长激光器的四能级速率方程模型进行了数值计算和分析,理论结果与实验相符。

A dual-wavelength diode side-pumped Nd:YAG laser is generating intermittent laser action at the wavelengths of 1064 nm and 1319 nm was demonstrated. By this means, the population inversion is distributed efficiently, mode competition of both laser lines can be avoided, the effect resulted from the accuracy of the coating process can be reduced and the stable output of dual-wavelength is easily obtained. Furthermore, under different operation conditions, the ratio of the output powers can be controlled by changing the delay time. For the input current 22 A, the pulse repetition rate 4 kHz and the delay time 10 μs, the output powers are 6.2 W for 1319 nm and 5.1 W for 1064 nm, respectively. The numerical simulation of the performance of the dual-wavelength laser has been considered basing on the rate equations of intermittent oscillation dual-wavelength laser and the theoretical analysis corresponds to the experimental result.