摘要
The mechanism of terahertz(THz) pulse coherent detection via two-color laser pulses of various frequency ratios in gas plasma is theoretically investigated.Our investigations demonstrate that except for the commonly used frequency ratio of 2, other uncommon frequency ratios can also be utilized to detect THz pulse, such as 2 n, n + 1/2(n ≤ 3, n is a positive integer).The well-developed transient photocurrent model is extended to our terahertz detection process.Based on this model, our simulation results can be explained by analyzing the process of asymmetric electron ionization and electron acceleration.
The mechanism of terahertz(THz) pulse coherent detection via two-color laser pulses of various frequency ratios in gas plasma is theoretically investigated.Our investigations demonstrate that except for the commonly used frequency ratio of 2, other uncommon frequency ratios can also be utilized to detect THz pulse, such as 2 n, n + 1/2(n ≤ 3, n is a positive integer).The well-developed transient photocurrent model is extended to our terahertz detection process.Based on this model, our simulation results can be explained by analyzing the process of asymmetric electron ionization and electron acceleration.
作者
Xin-Yang Gu
Ke-Jia Wang
Zhen-Gang Yang
Jin-Song Liu
顾新杨;王可嘉;杨振刚;刘劲松(Wuhan National Laboratory for Optoelectronics,Huazhong University of Science and Technology,Wuhan 430074,China;School of Optical and Electronic Information,Huazhong University of Science and Technology,Wuhan 430074,China)
基金
Project supported by the National Natural Science Foundation of China(Grant Nos.11574105,61475054,and 61405063)
