摘要
全固态红光激光器在激光显示、全息存储以及医疗领域有着重要应用,其中多波长红光激光器还可用于差频产生太赫兹辐射。基于三阶非线性效应受激拉曼散射的拉曼激光器是一种突破粒子数反转激光器有限发射光谱制约进而拓展激光波长的有效手段,即能够将注入的单一波长泵浦光直接拓展至一个或几个全新波段。笔者团队研制了一台绿光泵浦的多波长级联金刚石拉曼激光器,利用波长为532 nm、脉冲宽度为11.43 ns的激光作为泵浦源,通过将一阶Stokes黄橙光(573 nm)锁定在振荡器中,实现了红光波段的二阶、三阶和四阶(620 nm、676 nm和743 nm)级联拉曼激光输出,对应三个波长的脉冲宽度分别为10.41、3.75、2.45 ns,总输出能量为0.6 mJ,光光转换效率为36.38%。结果表明,凭借金刚石晶体优异的光学特性和拉曼性质,可见光泵浦的金刚石拉曼激光器对于实现高功率全固态小型化多波长红光激光输出具有巨大潜力。
Objective The all-solid-state multi-wavelength red laser has significant applications in laser color large-screen displays,high-density holographic storage,measurement,and medical treatment.Its multi-wavelength characteristics also enable it to serve as a terahertz light source through difference-frequency generation.Currently,the multi-wavelength red laser can be generated by combining the emission spectrum of an inversion particle gain medium with second-order nonlinear effects.However,these methods typically have lower conversion efficiency.Stimulated Raman scattering(SRS)is a high-intensity third-order nonlinear effect that offers flexible wavelength conversion,automatic phase matching,and beam cleanup.The cascaded frequency shift property of Raman crystals is an effective method for achieving multi-wavelength output using a single pump wavelength.Diamond crystals have a high Raman gain coefficient in the visible wavelength range compared to conventional Raman crystals.Pumping diamond with a well-established 532 nm laser has great potential for obtaining efficient,high-energy,high-beam quality multi-wavelength red laser output.In this study,we investigate the generation of multi-wavelength red laser output using cascaded diamond Raman oscillators pumped by a 532 nm laser and explore their output characteristics.Methods The setup of the multi-wavelength red diamond Raman laser is shown(Fig.1).The pump source is a self-built 532 nm frequency doubled nanosecond laser.The pump beam is collimated by the lens group F1 and F2.A half-wave plate(HWP)is used to adjust the polarization direction of the pump to be parallel to the<111>axis of the diamond crystal for the maximum Raman gain.The diamond Raman oscillator uses a plane-concave cavity with a curvature radius of 200 mm as the output mirror.The diamond size is 2 mm×4 mm×7 mm.The coating parameters of the two cavity mirrors are shown(Tab.1).The cavity mirrors are high reflection coated at first-order Stokes to increase the conversion efficiency and obtain pure hi
作者
张亚凯
陈晖
白振岙
庞亚军
王雨雷
吕志伟
白振旭
Zhang Yakai;Chen Hui;Bai Zhenao;Pang Yajun;Wang Yulei;Lv Zhiwei;Bai Zhenxu(Center for Advanced Laser Technology,Hebei University of Technology,Tianjin 300401,China;Hebei Key Laboratory of Advanced Laser Technology and Equipment,Tianjin 300401,China;Aerospace Information Research Institute,Chinese Academy of Sciences,Beijing 100094,China)
出处
《红外与激光工程》
EI
CSCD
北大核心
2023年第8期133-139,共7页
Infrared and Laser Engineering
基金
国家自然科学基金项目(61927815)
天津市自然科学基金项目(22JCYBJC01100)
量子光学与光量子器件国家重点实验室开放课题项目(KF202201)
河北工业大学基本科研业务费项目(JBKYTD2201)。
关键词
拉曼激光
金刚石
多波长
脉冲
高功率
Raman laser
diamond
multi-wavelength
pulse
high-power
