百赫兹大能量KTA双波长光参量振荡器  

100Hz High-Energy KTA Dual-Wavelength Optical Parametric Oscillator

作　　者：孟君 丛振华[1,2,3] 赵智刚 王上 亓云轩 张行愚 刘兆军[1,2,3] Meng Jun;Cong Zhenhua;Zhao Zhigang;Wang Shang;Qi Yunxuan;Zhang Xingyu;Liu Zhaojun(School of Information Science and Engineering,Shandong University,Qingdao,Shandong 266237,China;Shandong Provincial Key Laboratory of Laser Technology and Application,Qingdao,Shandong 266237,China;Key Laboratory of Laser and Infrared System Integration Technology Ministry of Education,Qingdao,Shandong 266237,China)

机构地区：[1]山东大学信息科学与工程学院,山东青岛266237 [2]山东省激光技术与应用重点实验室,山东青岛266237 [3]激光与红外系统集成技术教育部重点实验室,山东青岛266237

出　　处：《中国激光》2021年第12期141-149,共9页Chinese Journal of Lasers

基　　金：国家自然科学基金(62075116,12074222);山东省重点研发计划;山东省自然科学基金(ZR2020MF114,ZR2019MF039,ZR2020QF095);山东大学卓越团队基金;山东大学杰出中青年基金;山东大学齐鲁青年启动基金。

摘　　要：报道了百赫兹大能量KTiOAsO_4(KTA)晶体光参量振荡器(OPO)系统,并研制了脉冲重复频率为100 Hz、输出能量达580 mJ、波长为1064 nm的Nd∶YAG主振荡功率放大器。OPO谐振腔采用平平腔结构,用在X方向切割的KTA晶体作为非线性晶体。在脉冲重复频率为100 Hz时,得到1.53μm信号光和3.47μm闲频光的单脉冲能量分别为178 mJ和64 mJ,脉冲宽度分别为13.7 ns和11.8 ns,泵浦光到参量光的光-光转换效率为43.6%。Objective Laser sources at 1.5μm,providing high pulse energies and short pulse durations are used in various applications,such as electro-optical countermeasures and high precision ranging.Lasers at 3--5μm are used as lighting sources for active remote sensing and gas detection,which show important potential applications.Therefore,lasers with high energy at both wavelength bands have become research hotspots.The optical parametrical oscillators(OPO)are effective ways to generate lasers with wavelengths at 1.5μm and interval 3--5μm due to their compactness,wavelength-tunable property,and potential for generating high energy and short pulse width.Presently,the major nonlinear crystals with high-quality include biaxial crystals such as KTiOAsO4(KTA),KTiOPO4(KTP),ZnGeP2(ZGP),and periodically poled crystals such as PPKTP,PPLN,PPLT,etc.KTP crystals are used to obtain lasers at 1.5μm,which is affected by severe absorption in the mid-infrared region.To obtain lasers at 3--5μm,ZGP crystals have been under investigation for a long time.However,2μm pump sources are more in need,which is technically more difficult than their 1-μm counterpart.PPLN crystals are used to obtain mid-infrared lasers.Compared with crystals such as KTP,the damage threshold of PPLN crystals is lower.KTA and KTP crystals belong to the same crystal group and have a high damage threshold(>600 MW/cm2),large nonlinear coefficient(d24=3.2pm/V),large acceptance angle,a wide temperature range,and stable physical and chemical properties.The transmission performance of KTA crystals in the mid-infrared band(3--5μm)must be better than that of KTP crystals.These characteristics make KTA crystals suitable for high energy mid-infrared laser applications.In this study,we report a 100Hz high energy KTA crystal-based OPO system.Methods The 100 Hz high energy KTA-OPO system is composed of 1064nm Nd:YAG main oscillator power amplifier(MOPA)and KTA crystal-based OPO.The Nd∶YAG MOPA laser at 1064nm served as the pump source.To obtain high beam quality,the Nd∶

关 键 词：激光光学 全固态激光 非线性频率变换 光参量振荡器 

分 类 号：TN248[电子电信—物理电子学]