Investigations on beam quality improvement of an NCPM-KTA-based high energy optical parametric oscillator using an unstable resonator with a Gaussian reflectivity mirror  

作　　者：Jun Meng Chen Li Zhenhua Cong Zhigang Zhao Shang Wang Gaoyou Liu Zhaojun Liu 孟君;李晨;丛振华;赵智刚;王上;刘高佑;刘兆军(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》2022年第9期31-37,共7页中国光学快报（英文版）

基　　金：supported in part by the National Natural Science Foundation of China(Nos.62075116 and 62075117);Key Research Program of Shandong Province(No.2019JMRH0111);Natural Science Foundation of Shandong Province(Nos.ZR2019MF039 and ZR2020MF114);Founding for Qilu Young Scholars from Shandong University;China Postdoctoral Science Foundation(No.2021TQ0190)。

摘　　要：Beam quality improvements by a large margin for signal and idler beams of a high energy 100 Hz KTiOAsO_(4)(KTA)non-critical phase matching(NCPM)optical parametric oscillator(OPO)were demonstrated using an unstable resonator configuration instead of a plane-parallel one.Theoretically,influences of cavity lengths and transmission of an output coupler on the OPO conversion efficiency for both were numerically simulated.For OPO based on an unstable resonator with a Gaussian reflectivity mirror,the maximum pulse energies at the signal(1.53μm)and idler(3.47μm)were about 75 mJ and 26 mJ,respectively.The corresponding beam quality factors of the signal were M_(x)^(2)=9.8 and M_(y)^(2)=9.9,and M_(x)^(2)=11.2 and M_(y)^(2)=11.5 for the idler.As a comparison,128 mJ of signal and 48 mJ of idler were obtained with the plane-parallel resonator,and the M~2 factors of the signal were M_(x)^(2)=39.8 and M_(y)^(2)=38.4,and M_(x)^(2)=32.1 and M_(y)^(2)=31.4 for the idler.Compared with a plane-parallel cavity,over eight times and three times brightness improvements were realized for the signal and idler light,respectively.

关 键 词：optical parametric oscillators unstable resonator beam quality 

分 类 号：TN752[电子电信—电路与系统]