掺Yb3+全光纤环形腔主动调Q光纤激光器

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。

Actively Q-Switched Yb3+-Doped All Fiber Ring Laser

An all-fiber Q-switched Yb~(3 )-doped fiber ring laser pumped with a 976 nm laser diode (LD),which uses a fiber-pigtailed acousto-optic modulator (AOM) as the active Q-switching element,was reported.The stable pulse can be obtained when the modulation frequency was adjusted from 200 Hz to 60.9 kHz.The laser pulse with maximum peak power of 2.7 W,pulse width of 53.2 ns and pulse energy of 145.5 nJ is obtained,when the pumping power is 183 mW and the modulation frequency is 500.2 Hz.The alternate ouptut of high and low energy pulse is observed with the shorter Q-switched turnoff time,and it is explained by the principle of the Q-switched laser.The characteristics of pulse versus modulation frequency and pump power are investigated,and the theoretical calculation is in good agreement with the experimental result.