双色激光产生太赫兹辐射的调控机理研究  

Regulation mechanism study of terahertz radiation generated from two-color laser field

作　　者：葛委南 赵佳宇 GE Weinan;ZHAO Jiayu(School of Optical-Electrical and Computer Engineering,University of Shanghai for Science and Technology,Shanghai 200093,China)

机构地区：[1]上海理工大学光电信息与计算机工程学院,上海200093

出　　处：《光学仪器》2024年第3期58-64,共7页Optical Instruments

基　　金：上海市国内科技合作重点项目(21015800200)。

摘　　要：采用双色激光在气体介质中诱导产生太赫兹波的数值模拟方法,深入分析了各种激光参数对双色激光场产生太赫兹波的影响,目的是优化参数以实现太赫兹波辐射能量的最大化。模拟计算表明,双色激光的波长、相对相位、激光脉冲宽度等对瞬态电流和太赫兹能量都有调控作用,并且具有不同的规律性。此外,还通过分析激光电场、电子密度、光电流等相关因素,对双色激光场产生太赫兹波的物理机理进行了解释。该研究为在不同激光激发条件下提高太赫兹波辐射强度,提供了详尽的参数优化分析和理论支持,对后续大幅增强太赫兹辐射效率具有重要意义。In this paper,based on the numerical model of terahertz wave generated by two-color laser plasma in air,we studied the variation of terahertz wave generated from two-color laser field with different laser parameters,so as to obtain the strongest terahertz wave radiation energy.The simulation results show that the laser wavelength,relative phase,and laser pulse width could regulate the transient current and the radiated THz energy.In addition,we also explained the physical mechanism of terahertz wave generated by two-color laser plasma in air by analyzing the laser electric field,electron density,photocurrent and other related factors.These research results provide detailed parameter analysis and a theoretical basis for enhancing terahertz radiation energy with different laser parameters,which is of great significance for greatly enhancing terahertz radiation efficiency in the future.

关 键 词：太赫兹波 双色激光场 激光等离子体 瞬态电流 

分 类 号：O437[机械工程—光学工程]