圆偏振非谐波双色场产生太赫兹辐射理论研究  

Theoretical study on terahertz radiation generated by circularly polarized two-color lasers with the detuned second harmonic fields

作　　者：倪铭 陈曦 卢晨晖 NI Ming;CHEN Xi;LU Chenhui(School of Mechanical and Automotive Engineering,Shanghai University of Engineering Science,Shanghai 201620,China)

机构地区：[1]上海工程技术大学机械与汽车工程学院,上海201620

出　　处：《河南科技学院学报（自然科学版）》2023年第4期26-32,共7页Journal of Henan Institute of Science and Technology(Natural Science Edition)

基　　金：国家自然科学基金青年基金项目(11604205)。

摘　　要：基于二维光电流模型,通过数值模拟和理论分析,研究了相同螺旋性的双色圆偏振非谐波激光(CP-S)产生太赫兹辐射的特性.结果显示,随着倍频光的波长调谐,太赫兹频谱中将出现高频部分,并且其强度随着调谐的波长而增加.此外,太赫兹辐射的偏振态能够从近似的线偏振到圆偏振变化.理论分析表明,高频部分的强度的变化以及偏振的控制取决于非谐波双色场引起的电离事件的相干叠加.Based on a two-dimensional photocurrent model,the characteristics of terahertz radiation generated by a two-color circular-polarized non-harmonic laser(CP-S)with the same helical properties are studied by numerical simulation and theoretical analysis.The results show that the high-frequency part of the terahertz spectrum will appear with the wavelength tuning of the frequency-doubled light,and its intensity increases with the wavelength tuning.Moreover,the polarization state of terahertz radiation can vary from approximately linear to circular polarization.Theoretical analysis shows that the intensity variation and polarization control of the high frequency part depend on the coherent superposition of ionizing events caused by the non-harmonic two-color field.

关 键 词：二维光电流模型 圆偏振太赫兹辐射 频谱调制 非谐波 

分 类 号：O436[机械工程—光学工程]