耐高低温全功率范围可调的波长稳定半导体激光光源  

Stable Wavelength Diode Laser with High⁃and Low⁃Temperature Resistance Operating at Full⁃Power Range

作　　者：张兰平 蒋全伟[1,2] 郭林辉 叶涛[1,2] 谭昊 傅芸[1,2] 王昭[1,2] 高松信 Zhang Lanping;Jiang Quanwei;Guo Linhui;Ye Tao;Tan Hao;Fu Yun;Wang Zhao;Gao Songxin(Institute of Applied Electronics,Chinese Academy of Engineering Physics,Mianyang 621900,Sichuan,China;Key Laboratory of High Energy Laser Science and Technology,Chinese Academy of Engineering Physics,Mianyang 621900,Sichuan,China)

机构地区：[1]中国工程物理研究院应用电子学研究所,四川绵阳621900 [2]中国工程物理研究院高能激光科学与技术重点实验室,四川绵阳621900

出　　处：《中国激光》2023年第11期227-234,共8页Chinese Journal of Lasers

基　　金：JKW基础加强项目;中国工程物理研究院创新发展基金(HEL2020-03)。

摘　　要：半导体激光器(LD)的增益谱随着加载电流和温度的变化而变化,不同功率下LD的输出波长难以稳定。功率为120 W、中心波长为809 nm的LD在10%~100%功率出光期间的波长漂移约为6 nm,这对于激光器的直接应用是不利的。目前通常采用体布拉格光栅(VBG)锁定或片上分布式反射(DBR)、分布式反馈(DFB)的方法进行波长锁定来解决该问题,但仍存在低功率下波长不稳定的缺点。为此,本文提出了一种基于“电开关选通控制+光纤合束器”的半导体激光光源方案,通过在相同电流下控制激光器的挡位来调节功率,在不增加额外光学器件的情况下达到了波长稳定的目的;该光源包含数个12 W单模块LD、数个电功能模块、控制或通信软件、半导体制冷片(TEC)控温模块、光纤合束器、光学准直镜筒;该光源的中心波长稳定在808~810 nm范围内,功率大于120 W,光斑的非均匀性(均方根)<10%。该光源通过了高低温环境实验考核,可在-55~50℃范围内存放及工作,同时可满足冲击振动、电磁兼容环境下的实验要求。Objective Direct diode laser has many applications,such as pump source of fiber laser,laser illumination,laser fuze,beacon laser,and wireless energy transmission.However,it is subject to low beam quality and broad spectrum,leading to limited applications at high polymer absorption,coherent light source,spectrum analysis,and industrial processing.High beam quality can be achieved by improving the chip brightness or beam combing.Single-wavelength or narrow linewidth can be achieved through volume Bragg grating(VBG)locking,distributed Bragg reflector(DBR),or distributed feedback(DFB)grating structure on a chip.Unfortunately,under low power conditions,the wavelength cannot be locked because of weak feedback.Therefore,a novel method for wavelength locking was developed using an electric switch and a fiber beam combiner to solve the problem.We developed an LD(laser diode)source comprising a single LD module,electric function module,thermoelectric(TEC)heat dissipation module,fiber beam combiner,and collimation lens barrel.An LD with power exceeding 120 W,center wavelength of 809±1 nm,beam divergence smaller than 1°,spot inhomogeneity lower than 10%(root mean square)was realized.In addition,the relative environment experimentc were conducted.Methods The gain spectrum of LD changes with current and temperature.Therefore,we kept the work current and temperature constant and controlled the number of LDs to adjust power through the electric function module and fiber beam combiner.We conducted electric,optics,and thermal designs.Compared to the traditional approach,we utilized a separate power supply for each single LD to prevent extinguishing with the LD overload voltage.For the optics,a 19×1 fiber beam combiner was used to combine several LDs to achieve power combing and high uniformity.In addition,the TEC module was responsible for the heat dissipation of multiple LDs;in this manner,the maintainability of LDs which were distributed was improved.After estimation,we selected 12 pieces of 55 mm×55 mm TEC coolers for refri

关 键 词：激光器 波长稳定 电开关 分挡调节功率 半导体激光光源 

分 类 号：O436[机械工程—光学工程]