According to the theory of quasi\|phase\|matching (QPM), the periodical domain structure in gadolinium molybdate crystal for QPM second harmonic generation is designed.

• 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。