一种通过梯形PPMgLN波导倍频实现带宽可调谐光源的理论研究  

A Theoretical Study of Bandwidth Tunable Light Source by Frequency Doubling of Trapezoidal PPMgLN Waveguide

作　　者：陈家颖 张新彬 陈怀熹[1,2,3] 冯新凯 程星[1,2,4] 马磊 梁万国 CHEN Jiaying;ZHANG Xinbin;CHEN Huaixi;FENG Xinkai;CHENG Xing;MA Lei;LIANG Wanguo(Fujian Institute of Research on the Structure of Matter,Chinese Academy of Sciences,Fuzhou 350002,China;Fujian Science&Technology Innovation Laboratory for Optoelectronic Information of China,Fuzhou 350108,China;University of Chinese Academy of Sciences,Beijing 100049,China;College of Chemistry,Fuzhou University,Fuzhou 350108,China;College of Chemistry and Materials Science,Fujian Normal University,Fuzhou 350117,China)

机构地区：[1]中国科学院福建物质结构研究所,福州350002 [2]中国福建光电信息科学与技术创新实验室(闽都创新实验室),福州350108 [3]中国科学院大学,北京100049 [4]福州大学化学学院,福州350108 [5]福建师范大学化学与材料学院,福州350117

出　　处：《人工晶体学报》2022年第11期1830-1835,共6页Journal of Synthetic Crystals

基　　金：中国福建光电信息科学与技术创新实验室(闽都实验室)自主部署项目(2021ZZ104);国防基础科研项目(JCKY2022210.C007)。

摘　　要：本文设计了一种梯形的周期极化掺镁铌酸锂(PPMgLN)波导,并通过在传播方向上引入温度梯度来拓宽其倍频(SHG)过程的泵浦光源可接收带宽。通过有限差分的光束传输法,计算波导的有效折射率,并进行波导尺寸的设计。结果表明,通过改变梯形波导不同位置的温度,使其形成一个温度梯度,可拓宽泵浦光源的波长可接收带宽。本文所设计的PPMgLN波导最大泵浦光源可接收带宽为C波段,即1 530~1 565 nm,该波导可倍频C波段,得到输出波段带宽为765~782.5 nm,温度调谐范围为30~150℃。In this paper, a trapezoidal periodically poled magnesium doped lithium niobate(PPMgLN) waveguide was designed, and its acceptable bandwidth of the pump source during frequency doubling(SHG) process can be widened by introducing a temperature gradient along the propagation direction. The effective refractive index of the waveguide was calculated and the dimension of the waveguide was designed by the finite difference beam propagation method. The results show that, by changing the temperature at different positions of the trapezoidal waveguide to form a temperature gradient, the wavelength receiving bandwidth of the pump light source can be widened. The maximum receiving bandwidth of the PPMgLN waveguide pump light source designed in this paper is C-band, which range is from 1 530 nm to 1 565 nm. The waveguide can double the frequency of C-band, and the output band bandwidth is 765 nm to 782.5 nm, and the temperature tuning range is from 30 ℃ to 150 ℃.

关 键 词：周期极化铌酸锂 波导 准相位匹配 倍频 温度梯度 带宽扩展 C波段 

分 类 号：TN248[电子电信—物理电子学]