磷化锗锌波导传输损耗测试与光差频产生  

Measurement of transmission loss and generation of optical difference frequency in ZnGeP_(2) waveguide

作　　者：苗雨琇 杨雪梅[1] 胡波 梁厚昆 MIAO Yuxiu;YANG Xuemei;HU Bo;LIANG Houkun(School of Electronic Information,Sichuan University,Chengdu 610065,China)

机构地区：[1]四川大学电子信息学院,四川成都610065

出　　处：《红外与激光工程》2025年第2期169-176,共8页Infrared and Laser Engineering

摘　　要：二阶非线性频率转换的片上中红外激光器因具备超短脉冲输出、宽带可调谐、设计简单、转换高效、阈值低等优点,近年来备受关注。因此,亟需探索开发新的χ(2)波导平台来实现高效且宽带可调谐的长波红外激光产生。分别使用法布里-珀罗(Fabry-Perot)谐振腔法和截断法测试了磷化锗锌(ZnGeP_(2) )波导在1.55μm处和2.4μm处的基模传输损耗。实验结果表明,ZnGeP_(2) (ZGP)波导在1.55μm处的横电模(TE)和横磁模(TM)传输损耗分别为0.173 1、0.199 8 dB/cm;在2.4μm处的TE模传输损耗为0.8 dB/cm。在此传输损耗条件下,基于波长可调谐的2.4μm波段飞秒泵浦源与2.8μm波段信号源,在相位匹配角度为48.4o的ZGP波导内进行了光差频实验,实现了7~10μm波长范围内的闲频光可调谐输出,为基于双折射晶体的的集成化中红外激光器的实现提供了重要指导。Objective On-chip integrated mid-infrared lasers have emerged as a significant developmental direction in the field of mid-infrared lasers in recent years,attributed to their compact footprint,low energy consumption,and high conversion efficiency.In particular,on-chip integrated mid-infrared lasers based on nonlinear frequency conversion have garnered considerable attention from researchers due to their capabilities for ultra-short pulse output and broadband tunability.Notably,the advantageous physical property that the second-order nonlinear effects of materials vastly exceed their third-order nonlinear responses endows on-chip integrated mid-infrared lasers based on second-order nonlinear frequency conversion with numerous benefits,including straightforward design,high conversion efficiency,and low threshold levels.However,the current limitations in micro-nano fabrication techniques have resulted in a lack of reports on high-efficiency long-wave infrared lasers utilizing waveguide platforms of this type,specifically quasi-phase-matched crystal waveguides.Consequently,there is an urgent need to explore and develop newχ(2)waveguide platforms to facilitate the generation of high-efficiency,broadly tunable long-wave infrared lasers.Furthermore,this experiment involved a detailed assessment of the transmission loss of the designed ZnGeP_(2) waveguide,which features a phase-matching angle of 48.4º,and successfully generated long-wave infrared laser output through optical difference frequency generation.Methods Distinct loss measurement systems were established based on the principles of the Fabry-Pérot(F-P)cavity method and the truncation method(Fig.2-Fig.3)to conduct comprehensive assessments of the transmission loss of the designed ZnGeP_(2) waveguide,which possesses a phase-matching angle of 48.4º.Building upon these measurements,an experimental setup for optical difference frequency generation was developed utilizing two tunable optical parametric amplifier(OPA)sources as the pump and signal light(Fig.4).The

关 键 词：中红外激光 光差频 传输损耗 ZnGeP_(2)波导 法布里-珀罗腔 截断法 

分 类 号：O437[机械工程—光学工程]