2.94μm LiNbO_(3)声光调Q Er:YAG激光输出脉冲特性  

LiNbO_(3)acousto-optically Q-switched pulse characteristics of Er:YAG laser at 2.94μm

作　　者：王滔宁 姜玲玲 程庭清[1] 王礼 江海河[1,2] Wang Tao-Ning;Jiang Ling-Ling;Cheng Ting-Qing;Wang Li;Jiang Hai-He(Institute of Health and Medical Technology,Hefei Institutes of Physical Science,Chinese Academy of Sciences,Hefei 230031,China;University of Science and Technology of China,Hefei 230026,China;Anhui Institute of Optics and Fine Mechanics,Hefei Institutes of Physical Science,Chinese Academy of Sciences,Hefei 230031,China)

机构地区：[1]中国科学院合肥物质科学研究院,健康与医学技术研究所,合肥230031 [2]中国科学技术大学,合肥230026 [3]中国科学院合肥物质科学研究院,安徽光学精密机械研究所,合肥230031

出　　处：《物理学报》2024年第4期186-191,共6页Acta Physica Sinica

基　　金：国家重点研发计划(批准号:2018YFB0407204)资助的课题。

摘　　要：2.94μm纳秒铒激光是宽调谐中红外激光和临床医疗研究中重要的固体激光源.本文研制了新型LiNbO_(3)声光调Q Er:YAG激光器,研究了20 Hz重复频率下不同调Q延迟时间和耦合腔镜反射率对激光输出脉冲特性的影响规律.根据测量激光器的热透镜焦距设计了凹凸谐振腔补偿热透镜效应,获得了激光单脉冲能量为34.68 mJ、脉冲宽度为119.9 ns的调Q输出,相应的峰值功率为289.24 kW,与平平腔相比输出能量提高了2.09倍.据我们所知,这是目前声光调Q Er:YAG激光器中获得的最高能量,可为进一步研究宽调谐中红外激光技术提供新的手段.The 2.94μm nanosecond erbium laser is an important solid-state laser source in the wide-tuning mid-infrared laser and clinical medical research.In this work,a novel LiNbO_(3)acousto-optically Q-switched Er:YAG laser is developed,and the effects of different Q-switched delay times and output coupler’s reflectivities on the laser output pulse characteristics are investigated at a repetition frequency of 20 Hz.A concave-convex resonant cavity is designed to compensate for the thermal lens effect,and a single Q-switched pulse is obtained.The maximum pulse energy and minimum pulse duration are 34.68 mJ and 119.9 ns respectively,with corresponding peak power of 289.24 kW.Compared with the plane-plane cavity,the cavity proposed herein increases the output energy by 2.09 times.To our knowledge,this is the highest energy ever obtained in the acousto-optically Q-switched Er:YAG laser.This work provides a new means for further studying wide-tuning mid-infrared laser technology.

关 键 词：固体激光器 ER:YAG LiNbO_(3)声光调Q开关 

分 类 号：TN248.1[电子电信—物理电子学]