激光二次谐波在太赫兹液体相干探测技术中的作用与影响  

The Role and Influence of Laser Second Harmonic in the Terahertz Liquid Coherent Detection Technology

作　　者：王婧仪 杜海伟 WANG Jing-yi;DU Hai-wei(College of Measuring and Optical Engineering,Nanchang Hangkong University,Nanchang 330063,China;Key Laboratory of Nondestructive Testing(Ministry of Education),Nanchang 330063,China)

机构地区：[1]南昌航空大学测试与光电工程学院,江西南昌330063 [2]无损检测技术教育部重点实验室,江西南昌330063

出　　处：《红外》2024年第8期33-40,共8页Infrared

基　　金：国家自然科学基金项目(12064028);江西省自然科学基金项目(20232BAB201045);南昌航空大学研究生创新专项(YC2023-040)。

摘　　要：太赫兹空气相干探测技术是太赫兹领域一项重要的探测技术。利用液体水(或其他液体)为作用介质,可以对该技术进行改进。介绍了太赫兹液体相干探测技术的基本原理,详细分析了该技术中激光二次谐波的作用及其强度对探测结果的影响,即强度不同时太赫兹电场与强度信号不同比值下探测结果在时域和频域的特点和性质;分析了激光二次谐波强度不同时该技术从非相干到相干性的演化规律、探测激光能量和介质非线性系数对相干性的影响;探讨了固体材料在该技术中的使用,比较了气体、液体与固体材料在该技术中对产生激光二次谐波和探测结果的影响。该研究对理解和使用基于液体的太赫兹宽带相干探测技术有一定的帮助。Terahertz air-based coherent detection technology is an important detection method in the field of terahertz.By using liquid water(or other liquids)as the interaction medium,this detection technology can be improved.The basic principle of this detection technology is introduced,and the effect of laser second harmonic and its intensity on the detection results are analyzed in detail.The characteristics and properties of the detection results in the time and frequency domains under different ratios of terahertz electric field and intensity signal at different intensities are analyzed.The evolution law of the technology from incoherence to coherence at different laser second harmonic intensities is analyzed,as well as the influence of the intensity of the probe and the nonlinear coefficient of medium on the detection.The application of solid-state materials in this technology is discussed.The effects of gas,liquid,and solid-state materials on the generation of second harmonics and detection results are compared in this technology.The research results are helpful for understanding and using liquid-based terahertz broadband coherent detection technology.

关 键 词：太赫兹 相干探测 液体 二次谐波 

分 类 号：O433.4[机械工程—光学工程]