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用标量有限元方法计算了周期性极化的铌酸锂光波导中模折射率和模场分布 ,并在计算中引入铌酸锂晶体折射率与温度变化的关系 ,分析了准位相匹配铌酸锂波导倍频效率与极化反转光栅周期、基频光波长、波导器件温度等关系 .理论分析与实验结果符合得很好 .在此基础上 ,分析了波导制作参数与倍频效率、光栅周期与晶体温度 ,以及温度带宽与光栅通光方向长度等关系 ,进而对铌酸锂波导倍频器件进行优化设计 .
The mode refractive index and mode field distribution in periodically poled lithium niobate optical waveguide were calculated by the scalar finite element method. The relationship between refractive index and temperature was introduced in the calculation. The relationship between the efficiency of the lithium waveguide and the frequency of the polarization reversal grating, the wavelength of the fundamental frequency and the temperature of the waveguide device, etc. The theoretical analysis is in good agreement with the experimental results.On this basis, the fabrication parameters and frequency doubling efficiency of the waveguide are analyzed, Period and crystal temperature, as well as the temperature bandwidth and grating length of the relationship between the length and so on, and then lithium niobate waveguide multiplying devices for optimal design.