LD端面抽运全固态声光调Q228.5nm深紫外激光器  

LD End-Pumped All-Solid-State Acousto-Optical Q-Switched 228.5 nm Deep Ultraviolet Laser

作　　者：赵志斌 陈浩 徐东昕 程成 李权 刘国军 乔忠良 孙丽[2] 郑权 曲轶 薄报学 Zhao Zhibin;Chen Hao;Xu Dongxin;Cheng Cheng;Li Quan;Liu Guojun;Qiao Zhongliang;Sun Li;Zheng Quan;Qu Yi;Bo Baoxue(State Key Laboratory of High Power Semiconductor Laser,Changchun University of Science and Technology,Changchun,Jilin,130022,China;Key Laboratory of Laser Technology and Optoelectronic Functional Materials of Hainan Province,College of Physics and Electronic Engineering,Hainan Normal University,Haikou,Hainan 571158,China;Changchun New Industries Optoelectronics Technology Co.,Ltd.,Changchun,Jilin,130103,China)

机构地区：[1]长春理工大学高功率半导体激光国家重点实验室,吉林长春130022 [2]海南师范大学物理与电子工程学院海南省激光技术与光电功能材料重点实验室,海南海口571158 [3]长春新产业光电技术有限公司,吉林长春130103

出　　处：《中国激光》2022年第3期190-194,共5页Chinese Journal of Lasers

基　　金：海南省重大科技计划(ZDKJ2019005);海南省自然科学基金(618QN241,2019RC169,121QN228,519MS051、120MS031);海南省科协青年科技英才创新计划(QCXM201810);国家自然科学基金(61774024,61864002,61964007,11764012)。

摘　　要：采用三镜折叠V型谐振腔、声光调Q技术和三硼酸锂(LBO)晶体,对二极管端面抽运Nd∶YVO_(4)的914 nm基频光进行腔内倍频,实现了457 nm激光输出,利用I类相位匹配偏硼酸钡(BBO)晶体对457 nm蓝光进行腔外倍频,获得了228.5 nm深紫外激光。当抽运功率为17 W时,获得了平均功率为10 mW的228.5 nm深紫外激光输出,脉冲宽度为64.26 ns,重复频率为10 kHz。2 h内的激光输出稳定度为±2%。Objective Deep ultraviolet(DUV)lasers have an important and irreplaceable role in the field of spectral analysis.At present,DUV laser sources are mainly excimer lasers,gas lasers,solid-state lasers or those generated by synchrotron radiation.Deep ultraviolet all-solid-state lasers based on nonlinear frequency conversion have gained great popularity because of its compact,low system maintenance cost,and high efficiency.The most common approach is the fourth-harmonic generation of the 1064 nm laser line of Nd:YAG,which has been a commercial product for many years.Unfortunately,some particular spectroscopic applications require specific wavelengths in the DUV region.Based on Ti:Sapphire lasers,those with output power of several mW in the vicinity of 228 nm deep ultraviolet region have proved very suitable in the detection of genomic deoxyribonucleic acid methylation,protein structure,and explosive Raman spectroscopic analysis.However,Ti:Sapphire laser systems are complex,bulky,and inefficient.This paper introduces a new compact 228.5 nm high-repetition-rate,frequency-quadrupled Nd:YVO_(4) laser as a new excitation source for ultraviolet resonance Raman spectroscopic analysis.Methods Figure 1 shows the experimental principle.Via a V-shaped folded-cavity,the acousto-optical Q-switched technology and a LiB_(3)O_(5)(LBO)crystal,the 914 nm fundamental laser has been obtained by laser diode(LD)endpumping,which is then used for intra-cavity frequency doubling generation of a pulsed 457 nm laser.This blue laser is frequency-converted to a 228.5 nm laser in aβ-BaB_(2)O_(4)(BBO)crystal.The pump source is a 30 W 808 nm fiber-coupled LD with a core diameter of 400μm and a numerical aperture of 0.22.The coupling system is composed of two plano-convex mirrors with a focal length of 10 mm.The pumping light is focused and collimated into a light beam of about 250μm in radius through the collimation and focusing system.A Nd:YVO_(4)crystal with a doping concentration(atomic fraction)of 0.1%and a dimension of 4 mm × 4 mm × 5 mm i

关 键 词：激光器 全固态激光器 声光调Q技术 深紫外激光 228.5 nm激光 

分 类 号：TN248.1[电子电信—物理电子学]