近红外激光泵浦的可调谐中红外固体激光器研究进展(特邀)  

Research Progress of Tunable Mid-infrared Solid State Laser Pumped by Near-infrared Laser(Invited)

作　　者：陈锴 徐德刚[1,2,3] 贺奕焮 钟凯[1,2,3] 李吉宁 王与烨[1,2,3] 姚建铨[1,2,3] CHEN Kai;XU Degang;HE Yixin;ZHONG Kai;LI Jining;WANG Yuye;YAO Jianquan(School of Precision Instrument and Optoelectronics Engineering,Tianjin University,Tianjin 300072,China;Key Laboratory of Optoelectronics Information Technology of Ministry of Education,Tianjin University,Tianjin 300072,China;Key Laboratory of Micro Opto-electro Mechanical System Technology(Ministry of Education),Tianjin University,Tianjin 300072,China;Beijing Institute of Electronic System Engineering,Beijing 100854,China)

机构地区：[1]天津大学精密仪器与光电子工程学院,天津300072 [2]天津大学光电信息技术教育部重点实验室,天津300072 [3]天津大学微光机电系统技术教育部重点实验室,天津300072 [4]北京电子工程总体研究所,北京100854

出　　处：《光子学报》2023年第9期1-28,共28页Acta Photonica Sinica

基　　金：国家自然科学基金(Nos.U22A20123,62175182,62275193,U22A20353)。

摘　　要：基于非线性光学频率变换技术的可调谐中红外激光器在光电对抗、气体检测、生物医学等应用领域有着重要价值。近红外激光,尤其是1μm激光直接泵浦的可调谐中红外激光器具有结构紧凑、调谐范围宽、稳定性高的优势。从非线性光学频率变换技术的核心器件——非线性晶体出发,综述新型非氧化型晶体在可调谐中红外激光产生中的应用现状,介绍了不同晶体的光学特性及实现中红外产生的方法。针对可调谐中红外激光源的调谐范围、单脉冲能量、重复频率等关键参数,分析了不同晶体的中红外产生性能及其适用的中红外产生方法。最后对近红外激光器泵浦的可调谐中红外激光器进行了展望。Tunable mid-infrared lasers based on nonlinear optical frequency conversion play a vital role in application fields including environment monitoring,remote sensing and biomedical diagnosis.The longterm development of near-infrared laser technology has led to a high degree of commercialization of nearinfrared pumped lasers.The utilized of the commercial near-infrared laser as the pump source is easy to realize miniaturization,high power and high stability operation of the tunable mid-infrared laser.Nonlinear optical crystal,which is the core component of the tunable mid-infrared laser,determines the output characteristics of the mid-infrared laser source.Suffering from multi-phonon absorption,the tunable output band of traditional oxide crystals is limited to below 4μm.On the other hand,the most commonly used ZnGeP_(2) has strong two-photon absorption at 1.06μm.High-quality mid-infrared crystal pumped by nearinfrared laser have remained of great interest in recent years.In this paper,we reviewed the application of the newly developed non-oxide crystals in mid-infrared laser generating.BaGa4Se7 and BaGa_(4)S_(7) have wide transparency range,high laser damage threshold and nonlinear coefficient.Using a low repetition frequency pump source,the tunable output range covers the entire mid-infrared band,and the output energy achieves mJ-level even in the long wave infrared band.Under a pump repetition rate of hundreds of Hz,the average output power in the mid-wave infrared band reaches 1 W.However,due to the low thermal conductivity of these two crystals and the near-infrared absorption,there is no report on the near-infrared laser pumped source with repetition rate of kHz-level and average output power of W-level.Subsequent research mainly focused on the improvement of pump and crystal cooling conditions.LiGaSe_(2) and LiGaS_(2) crystals are suitable for near-infrared ultrashort pulse pumping to produce mid-infrared lasers due to their large band gap.In particular,LiGaS_(2) crystal has high laser damage threshold and

关 键 词：中红外激光器 非线性光学频率变换 光学参量放大 光学参量振荡 差频产生 

分 类 号：TN248.1[电子电信—物理电子学]