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设计了激光二极管(LD)双端面抽运传导冷却复合Nd:YAG晶体电光调Q激光器,实现脉冲间隔可调的双Q脉冲输出。用两个光纤耦合输出的LD模块作为抽运源,偏硼酸钡(BBO)晶体作为Q开关,在一个抽运周期内两次启动Q开关,获得脉冲能量大于14mJ,脉宽小于等于18ns,脉冲间隔200～230μs可调的双Q脉冲输出,激光器重复频率50Hz,光-光转换效率达到24%。探索了用磷酸二氘钾(KD*P)调Q晶体开关实现稳定双脉冲输出的可行性,通过抑制压电环效应,消除子脉冲现象,最终获得脉冲能量约11mJ,脉宽小于等于18ns。
A laser diode (LD) double-ended pumping Nd-YAG crystal electro-optical Q-switched laser was designed and realized. The Q pulse output with adjustable pulse interval was designed. With two fiber-coupled output LD modules as pumping source and barium metaborate (PBO) crystal as Q-switch, the Q-switch is activated twice in one pumping cycle to obtain pulse energy greater than 14mJ and pulse width less than or equal to 18ns. The pulse Double Q pulse output with adjustable interval of 200 ~ 230μs, laser repetition frequency of 50Hz and light-light conversion efficiency of 24%. The feasibility of stabilizing dual pulse output with KD * P Q-switched crystal was explored. By suppressing the piezoelectric ring effect and eliminating the sub-pulse, the pulse energy was about 11 mJ and the pulse width was less than or equal to 18 ns.