以光栅衍射理论为基础,从理论上分析研究了微结构晶体衍射效率与占空比和折射率的关系.采用波长为532nm,最大功率为80mW的连续激光为光源,分别对周期极化掺镁铌酸锂微结构晶体和周期极化同成分铌酸锂微结构晶体的占空比及极化反转引起的折射率变化进行了测试.测试结果表明,掺镁铌酸锂晶体周期极化反转所引起的折射率改变量大于同成分铌酸锂晶体极化反转所引起的折射率变化.
Based on the grating diffraction theory, the duty cycle and refractive index change of the periodically poled microstructure (PPMS) crystal are studied theoretically by light diffraction efficiency. The duty cycle and refractive index change of PPMS LiNbO3 : MgO and PPMS LiNbOs were investigated using a laser of wavelength 532 nm and maximal power 80 mW, respectively. The refractive index change of PPMS LiNbO3 : MgO is larger than that of PPMS LiNbO3.