Beam quality improvement of the high-energy KTA-OPO based on a confocal unstable cavity with Gaussian reflectivity mirror  

作　　者：孟君 李晨 丛振华 赵智刚 王上 刘高佑 刘兆军 Jun Meng;Chen Li;Zhenhua Cong;Zhigang Zhao;Shang Wang;Gaoyou Liu;Zhaojun Liu(School of Information Science and Engineering,Shandong University,Qingdao 266237,China;Shandong Provincial Key Laboratory of Laser Technology and Application,Qingdao 266237,China;Key Laboratory of Laser&Infrared System(Shandong University),Ministry of Education,Qingdao 266237,China;Center for Optics Research and Engineering,Shandong University,Qingdao 266237,China)

机构地区：[1]School of Information Science and Engineering,Shandong University,Qingdao 266237,China [2]Shandong Provincial Key Laboratory of Laser Technology and Application,Qingdao 266237,China [3]Key Laboratory of Laser&Infrared System(Shandong University,Ministry of Education,Qingdao 266237,China [4]Center for Optics Research and Engineering,Shandong University,Qingdao 266237,China

出　　处：《Chinese Optics Letters》2023年第5期42-46,共5页中国光学快报（英文版）

基　　金：supported by the National Natural Science Foundation of China(Nos.62075116 and 62075117);Key Research Program of Shandong Province(No.2020JMRH0302);Natural Science Foundation of Shandong Province(Nos.ZR2019MF039,ZR2020MF114,and ZR2022QF087);Founding for Qilu Young Scholars from Shandong University;China Postdoctoral Science Foundation(No.2021TQ0190)。

摘　　要：A high-energy 100-Hz optical parametric oscillator(OPO)based on a confocal unstable resonator with a Gaussian reflectivity mirror was demonstrated.A KTA-based OPO with a good beam quality was obtained when the magnification factor was 1.5,corresponding to the maximum signal(1.53μm)energy of 56 m J and idler(3.47μm)energy of 20 m J,respectively.The beam quality factors(M^(2))were measured to be M^(2)_(x)=5.7,M^(2)_(y)=5.9 for signal and M^(2)_(x)=8.4,M^(2)_(y)=8.1 for idler accordingly.The experimental results indicated that the beam quality positively changed with the increase of magnification factors,accompanied by an acceptable loss of pulse energy.

关 键 词：optical parametric oscillators confocal unstable resonator beam quality 

分 类 号：O439[机械工程—光学工程]