基于整形飞秒激光脉冲泵浦光电导天线的宽带太赫兹辐射研究  

Research on Broadband Terahertz Radiation Based on Shaped Femtosecond Laser Pulse Pumped Photoconductive Antenna

作　　者：刘君威 王婧仪 胡枫 杜海伟 LIU Jun-wei;WANG Jing-yi;HU Feng;DU Hai-wei(College of Measuring and Optical Engineering,Nanchang Hangkong University,Nanchang 330063,China;College of International Education,Nanchang Hangkong University,Nanchang 330063,China;Key Laboratory of Nondestructive Testing of Ministry of Education,Nanchang Hangkong University,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]南昌航空大学国际教育学院,江西南昌330063 [3]南昌航空大学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5期39-46,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)。

摘　　要：飞秒激光脉冲泵浦光电导天线可以产生宽带太赫兹脉冲辐射。采用具有缓慢上升--快速下降整形脉冲包络的飞秒激光脉冲与光电导天线作用产生宽带太赫兹辐射,基于Drude-Lorentz模型计算了太赫兹辐射的规律,并讨论了激光脉冲脉宽和半导体载流子寿命对太赫兹辐射产生的影响。研究结果表明,尽管这种整形飞秒激光脉冲的能量有所损失,但是这种泵浦方式能够比普通飞秒激光脉冲泵浦光电导天线产生更宽的太赫兹辐射。该结果为实验上基于光电导天线产生宽带太赫兹脉冲辐射提供了新的思路。The photoconductive antennas pumped by femtosecond laser pulses can generate broadband terahertz pulse radiation.A femtosecond laser pulse with a slowly rising-rapidly falling-shaped pulse envelope is used to interact with a photoconductive antenna to generate broadband terahertz radiation.The law of terahertz radiation is calculated based on the Drude-Lorentz model.The influence of laser pulse duration and semiconductor carrier lifetime on terahertz radiation is discussed.The research results indicate that although the energy of this shaped femtosecond laser pulse is lost,this pumping method can generate wider terahertz radiation than normal femtosecond laser pulse-pumped photoconductive antennas.This result provides a new approach for generating broadband terahertz pulse radiation based on photoconductive antennas in experiments.

关 键 词：光电导天线 太赫兹辐射 整形激光脉冲 缓慢上升-快速下降 

分 类 号：O434.3[机械工程—光学工程]