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根据准相位匹配原理 ,对钼酸钆晶体用于准相位匹配倍频过程的周期性畴结构进行了设计 ,当入射基频光为 1 .0 64μm时 ,所需的钼酸钆晶体畴结构周期为 5 .54μm。利用外电场极化 ,当外电场为 2 .5kV/mm时 ,钼酸钆晶体的畴结构反转时间tc=50 0～ 60 0 μs。当外电场脉冲幅值为 2 .5kV/mm、脉冲延续时间t=0 .6～ 0 .8tc 时 ,在钼酸钆晶体中制备得到了周期畴结构。当Nd∶YAG纳秒激光器输出准连续功率为 7～ 1 0mW的 1 0 64μm激光通过具有周期畴结构的样品时 ,获得了 0 .532 μm的倍频光输出
According to the principle of quasi-phase matching, the periodic domain structure of gadolinium molybdate crystal for the quasi-phase-matching frequency doubling process is designed. When the fundamental frequency of incident light is 1.04μm, the desired domain structure period of gadolinium molybdate crystal Is 5.54 μm. Using external electric field polarization, when the external electric field is 2.5kV / mm, the domain structure of gadolinium molybdate crystal has a reversal time tc = 50 0 ~ 60 0 μs. The periodic domain structure was prepared in the gadolinium molybdate crystal when the pulse amplitude of the external electric field was 2.5kV / mm and the pulse duration was 0.6-6.8tc. When the Nd: YAG nanosecond laser outputs a laser with a continuous-wave power of 7 ~ 10 mW and passes through a sample with a periodic domain structure, a doubling light output of 0.532 μm is obtained