基于波导型周期性极化铌酸锂倍频产生507 nm激光  

Second Harmonic Generation of 507 nm With Periodically Poled Lithium Niobate Waveguide

作　　者：张梦娇[1] 祁诗阳 刘小标 袁超[1] Zhang Mengjiao;Qi Shiyang;Liu Xiaobiao;Yuan Chao(College of Science,Henan Agricultural University,Zhengzhou,Henan 450002,China)

机构地区：[1]河南农业大学理学院,河南郑州450002

出　　处：《应用激光》2020年第2期357-361,共5页Applied Laser

基　　金：国家自然基金项目(项目编号:11704099);河南省高等学校重点科研项目(项目编号:18B140004)。

摘　　要：磁四极跃迁1S0-3P2是镱原子的一个重要跃迁,为了利用该跃迁研究超出标准模型的新物理,需要利用507 nm激光实现该跃迁的直接激发。本文基于光纤耦合与单透镜耦合两种方式在波导型周期性极化铌酸锂中实现了1014 nm激光到507 nm激光的倍频转换。通过测量倍频光功率随晶体温度的变化曲线研究了晶体的光学不均匀性;依据倍频光功率与基频光功率的关系研究了耦合透镜焦距对倍频转换的影响;实验显示,21 mW 1014 nm激光经光纤耦合入射铌酸锂晶体后得到316μW的507 nm激光输出,且透镜耦合中随着耦合透镜焦距的减小倍频光输出功率逐渐增加。Magnetic quadrupole transition1S0-3P2 is an important transition of ytterbium atoms.In order to investigate new physics beyond the Standard Model with1S0-3P2transition,it need to be excited directly through 507 nm light.In this paper,laser at 507 nm is generated by frequency doubling of laser at 1014 nm with periodically poled lithium niobate(PPLN)waveguide,and the laser coupling is based on fiber or single lens.Optical inhomogeneities is studied by measuring the power turning curve of second harmonic generation(SHG)with temperature,and the frequency conversion dependence on lens focal length is investigated under the relation between the power of SHG and fundamental light.The experimental shows that the 507 nm light of 316μW is generated with 21 mW fundamental light which is coupled into lithium niobate crystal with fiber,and the power will be higher with the decrease of the focal length in the lens coupling scheme.

关 键 词：倍频 波导 周期性极化铌酸锂 光纤耦合 透镜耦合 镱原子 

分 类 号：O432.1[机械工程—光学工程]