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报道了用976 nm激光二极管(LD)抽运掺Yb~(3+)增益光纤,用光纤耦合的声光调制器(AOM)实现全光纤环形腔主动调Q激光输出的实验研究。激光器的调制频率在200 Hz～60.9 kHz之间调节时获得稳定的调Q脉冲输出。当抽运光功率为183 mW,调制频率为500.2 Hz时,获得输出峰值功率为2.7 W,脉冲宽度为53.2 ns,单脉冲能量为145.5 nJ的激光脉冲,激光器的输出波长为1030 nm。当Q开关关闭时间较短时,从实验中观察到高低脉冲间隔输出的情况,利用调Q原理给出了相应解释。从实验和理论上分析了调制频率和抽运功率对激光器输出脉冲的影响,并进行了相应的计算,计算值和实验结果符合得较好。
The experimental research on active Q-switched laser output of all-fiber annular cavity by pumping a Yb 3+ gain fiber with a 976 nm laser diode (LD) and using a fiber-coupled acousto-optic modulator (AOM) was reported. The laser’s modulation frequency achieves a stable Q-switched pulse output when it is adjusted between 200 Hz and 60.9 kHz. When the pump power is 183 mW and the modulation frequency is 500.2 Hz, a laser pulse with a peak power of 2.7 W, a pulse width of 53.2 ns and a single pulse energy of 145.5 nJ is obtained. The output wavelength of the laser is 1030 nm. When the Q switch is off for a short time, the output of the high and low pulse intervals is observed experimentally, and the corresponding explanation is given by using the Q-switching principle. The effects of modulation frequency and pumping power on the output pulse of the laser are analyzed experimentally and theoretically, and the corresponding calculations are made. The calculated values are in good agreement with the experimental results.