基于非线性频率变换的长波红外激光器研究进展  

Research Progress of Long-Wave Infrared Lasers Based on Nonlinear Frequency Conversion

作　　者：白振旭 高嘉 赵臣 颜秉政 齐瑶瑶 丁洁 王雨雷 吕志伟 Bai Zhenxu;Gao Jia;Zhao Chen;Yan Bingzheng;Qi Yaoyao;Ding Jie;Wang Yulei;LüZhiwei(Center for Advanced Laser Technology,Hebei University of Technology,Tianjin 300401,China;Hebei Key Laboratory of Advanced Laser Technology and Equipment,Tianjin 300401,China;Science and Technology on ElectroOptical Information Security Control Laboratory,Tianjin 300308,China)

机构地区：[1]河北工业大学先进激光技术研究中心,天津300401 [2]河北省先进激光技术与装备重点实验室,天津300401 [3]光电信息控制和安全技术重点实验室,天津300308

出　　处：《光学学报》2023年第3期142-155,共14页Acta Optica Sinica

基　　金：国家自然科学基金重大科研仪器研制项目(61927815);中国科学院功能晶体与激光技术重点实验室开放课题(FCLT202004);量子光学与光量子器件国家重点实验室开放课题(KF202201);河北工业大学基本科研业务费资助(JB‑KYTD2201)。

摘　　要：8~12μm长波红外波段激光位于大气传输窗口并覆盖诸多气体分子的吸收带,在大气探测、光电对抗等领域具有重要的应用。目前,通过粒子数反转激光器直接辐射以及非线性频率变换间接辐射是实现8~12μm长波红外激光输出的主要方式。其中,基于非线性光学晶体频率转换的长波红外激光器具有结构紧凑、波长选择灵活、功率拓展性强等优势,近年来得到了快速发展和广泛应用。本文对二阶非线性频率变换的光学晶体、工作原理,以及获得长波红外激光的研究进展进行综述,并对基于受激拉曼散射的三阶非线性频率变换获得长波红外的方法进行了介绍和展望。Significance The 8-12μm longwave infrared(LWIR)laser,which is within the atmospheric transmission window and the eyesafe range and demonstrates a higher transmittance in atmospheric media(Fig.1),has critical applications in various fields,such as directed infrared countermeasures,environmental monitoring,lidar,and surgery.For example,the laser in this LWIR band plays an important role in environmental monitoring and differential absorption lidar because this band covers the fundamental absorption bands of many gas molecules,such as H2O,CO_(2),NH3,and O3.In terms of medical treatment,the 8-12μm LWIR laser,with a large absorption coefficient and a shallow penetration depth in water and other components of biological tissues,serves as a unique and effective tool in biological tissue treatment.In addition,highenergy 8-12μm LWIR lasers are in high demand in the field of defense.At present,approaches to 8-12μm LWIR laser mainly include direct radiation from gain media represented by carbon dioxide(CO_(2))lasers and semiconductor quantum cascade lasers(QCLs)and nonlinear optical techniques represented by secondorder nonlinear frequency conversion.CO_(2) lasers have been one of the most mature coherent radiation sources for the LWIR band since the invention of the first CO_(2) laser in 1964.However,their output wavelengths are limited to the spectral lines of 9.2-9.8μm and 10.1-11μm.In addition,since CO_(2) lasers usually need to be supported by a large cooling system,the overall size of the device is huge,which greatly limits the application range of CO_(2) lasers.QCLs feature a broad emission spectrum(3.5-160µm)with a relatively narrow linewidth and favorable wavelength tunability.However,due to the limited depth of their quantum wells,QCLs offer low efficiency in the 8-12µm band and consequently fail to achieve highpower and highpulse energy operation.Besides,they are difficult to design and entail a relatively high manufacturing cost.Although 8-12μm LWIR lasing has already been achieved with gas and semicond

关 键 词：激光器 长波红外激光 非线性频率变换 8~12μm 非线性晶体 

分 类 号：TN248.1[电子电信—物理电子学]