外腔级联金刚石拉曼激光输出特性仿真  

Output Characteristic Simulation of External Cavity Cascaded Diamond Raman Laser

作　　者：李晓伟 陈晖[1,2] 崔雨凡 丁洁 齐瑶瑶 颜秉政 王雨雷 吕志伟 白振旭 Li Xiaowei;Chen Hui;Cui Yufan;Ding Jie;Qi Yaoyao;Yan Bingzheng;Wang Yulei;LüZhiwei;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)

机构地区：[1]河北工业大学先进激光技术研究中心,天津300401 [2]河北省先进激光技术与装备重点实验室,天津300401

出　　处：《光学学报》2024年第22期154-161,共8页Acta Optica Sinica

基　　金：国家自然科学基金(62375076,61927815);河北省自然科学基金(F2023202063);天津市自然科学基金(22JCYBJC01100);量子光学与光量子器件国家重点实验室开放课题(KF202201)。

摘　　要：具有宽光谱透过范围和大拉曼频移特性的金刚石晶体在作为拉曼介质实现多波长激光输出方面具有显著优势。为了实现高效率的多波长拉曼激光转换,同时实现多参数的可调控输出,需要对高阶Stokes光输出特性进行理论分析。基于外腔拉曼稳态模型推导了三阶Stokes光特性理论公式,并利用该模型预测了外腔泵浦金刚石拉曼激光器的关键参数对运转特性的影响;有效模拟了三阶Stokes光输出透过率与最大转换效率及拉曼激光产生阈值之间的关系,并分析了不同泵浦功率时,泵浦光束腰半径、输出镜透过率、金刚石晶体长度等参数与输出功率之间的关系。本理论模型可为级联晶体拉曼激光器的实验研究提供参考和指导。Objective Lasers with different wavelengths have crucial applications such as optoelectronic countermeasures,lidar,precision measurement,and medical treatment.Compared to traditional population inversion lasers,stimulated Raman scattering(SRS)technology featuring a large Raman frequency shift is more conducive to the wavelength expansion of lasers and can achieve wavelength outputs that are difficult for conventional lasers to obtain.Additionally,unlike other second-order nonlinear effects,the self-phase matching characteristic of SRS allows for the generation of Stokes optical outputs at multiple frequencies via cascaded conversion in a gain medium.Diamond is an excellent Raman crystal providingultra-high thermal conductivity(>2000 W·m^(-1)·K^(-1))and a high Raman gain coefficient(~10 cm/GW@1μm),andoutperforming other Raman crystals such as YVO_(4),BaWO_(4),KGW,and Ba(NO_(3))_(2).The diamond Raman laser(DRL)based on cascaded conversion is an effective method for generating multi-wavelength laser output.Meanwhile,atheoretical output characteristic analysis of high-order Stokes light is necessary to achieve efficient multi-wavelengthRaman laser conversion and adjustable output with various parameters.Methods We derive the theoretical equation for the third-order Stokes output characteristics in continuous wave pumpingconditions based on the first-order and second-order external cavity Raman steady-state models.The steady-state equationsfor first-order and second-order Stokes while generating third-order Stokes light are obtained.The Raman cavity mode issimulated based on the designed diamond Raman resonator.The beam radii of the pump and first-order,second-order,andthird-order Stokes light are determined.By employing a steady-state model and resonant cavity parameters of the designedDRL,we predict the output characteristics of a continuous wave external cavity pumped DRL.Additionally,we simulatethe interaction between the output transmittance,maximum conversion efficiency,and Raman generation threshold of theth

关 键 词：多波长 金刚石 受激拉曼散射 级联转换 稳态模型 

分 类 号：O436[机械工程—光学工程]