人工晶体学报2024，Vol.53Issue(3)：449-457,9.
极化电极均匀化设计调控铌酸锂周期极化占空比
Poling Electric Field Uniformization Design Regulates the Duty Cycle of Periodically Poled Lithium Niobate
摘要
Abstract
In theory,quasi phase match(QPM)can make full use of nonlinear optical coefficient of the crystal,and has no deviation effect,which has great advantages in optical frequency conversion.Lithium niobate crystal(LiNbO3,LN)has high nonlinear optical coefficient,wide optical range and low growth cost,causing the periodically poled lithium niobate crystal(PPLN)based on the design of ferroelectric domain structure is an ideal choice for QPM.At present,the most commonly used method for fabricating PPLN crystal is applied electric field method.In the fabrication process,the parameters of electrode structure are important for the poling process.Based on the electric field poling process under real-time monitoring and finite element analysis,this paper analyzed the spatial electric field distribution of different electrode structures.It is found that the electric field maximum appears at the edge ofthe electrode,the electric field distribution inside the electrode is relatively uniform.Based on this phenomenon,a design scheme of multi-channel electrode structure is proposed to achieve uniform distribution of electric field in poled area.By characterizing the duty cycle ratio of each channel,it is found that the duty cycle ratio of the inner eight channels are uniform and within 50％±5％.Through the SHG experiment of crystals,it is found that the nonlinear conversion efficiency of the inner channel relative to the edge channel in the sample of ten-channel periodic poling is significantly improved and uniformly distributed.It is proved that the middle channels have a uniform poling structure with controllable duty cycle,which provides an effective design for generating uniform poling electric fields.关键词
铌酸锂/周期极化铌酸锂/非线性光学/空间电场分布/有限元分析Key words
lithium niobate/periodically poled lithium niobate/nonlinear optics/spatial electric field distribution/finite element analysis分类
数理科学引用本文复制引用
刘齐鲁,郑名扬,高洋,张龙喜,宋于坤,王孚雷,刘宏,王东周,桑元华..极化电极均匀化设计调控铌酸锂周期极化占空比[J].人工晶体学报,2024,53(3):449-457,9.基金项目
山东省自然科学基金(ZR2020LLZ009,ZR2021QE045) （ZR2020LLZ009,ZR2021QE045）
中国博士后科学基金第74批面上资助(2023M742052) （2023M742052）
国家资助博士后计划(GZC20231430) （GZC20231430）
