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被动调Q激光器的输出抖动一般较大,为了降低这一输出时间抖动,同时实现激光器的小型化,可以根据增益开关工作原理,利用电源控制抽运功率密度变化,实现被动调Q情况下的增益开关。根据这一原理研制了环形激光二极管(LD)抽运增益开关调Q激光器。这种新型被动调Q激光器的输出能量为30 mJ,输出脉冲宽度约16 ns。实验中将传统的两套抽运源减少为一套,通过控制电源波形直接形成抽运功率的增益台阶脉冲,减少了影响时间跳动的因素。多发次统计测量结果表明,激光脉冲与电源输出外触发信号的时间抖动小于1μs。根据测量的抽运预脉冲功率稳定性和阶跃脉冲的瞬时抽运功率计算的输出抖动与实验结果基本相符。
Passive Q-switched laser output jitter is generally larger, in order to reduce the output time jitter, while achieving the laser miniaturization, according to the principle of gain switching, the use of power control pumping power density changes, to achieve the passive Q-gain case switch. According to this principle, a ring laser diode (LD) pumping gain switching Q-switched laser is developed. The new passive Q-switched laser has an output power of 30 mJ and an output pulse width of about 16 ns. In the experiment, the traditional two pumping sources were reduced to a set, and the step-by-step pulse of pumping power was formed directly by controlling the power waveform, which reduced the factors that affect the time-to-frequency fluctuation. The results of multiple secondary statistics show that the time jitter of external trigger signal of laser pulse and power supply is less than 1μs. The output jitter calculated on the basis of the measured pump pre-pulse power stability and the instantaneous pump power of the step pulse basically agrees with the experimental results.