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针对退火质子交换(APE)MgO∶PPLN波导在中红外差频转换过程中存在模场约束能力弱、模场重叠因子小等问题,提出一种基于反质子交换(RPE)工艺的高效MgO∶PPLN脊波导的设计新方法。采用RPE工艺,使波导区域折射率呈对称分布,有效调控基频光和闲频光模场分布,提高模场重叠因子。仿真结果显示,相比于APE MgO∶PPLN脊波导,该新型脊波导可将基频光和闲频光的基模模场调控至波导中部区域,模场重叠因子由0.271 4μm-1提高至0.461 4μm-1,相应的中红外差频转换效率提高了2.98倍。
Aiming at the problems of low mode field restraint ability and small mode field overlap factor during the mid-infrared difference frequency conversion of annealing proton exchange (APE) MgO: PPLN waveguide, an efficient MgO: PPLN based on anti-proton exchange (RPE) New Design Method of Ridge Waveguide. The RPE process is adopted to make the refractive index in the waveguide region symmetrical, effectively controlling the distribution of the fundamental mode light and the idler optical mode field, and increasing the mode field overlap factor. The simulation results show that compared with the APE MgO: PPLN ridge waveguide, the new ridge waveguide can adjust the fundamental mode mode field of the fundamental and idler beams to the central region of the waveguide, and the mode field overlap factor increases from 0.271 4μm-1 to 0.461 4μm-1, the corresponding middle infrared difference frequency conversion efficiency increased by 2.98 times.