中国物理B ›› 2019, Vol. 28 ›› Issue (9): 98701-098701.doi: 10.1088/1674-1056/ab37fc

• INTERDISCIPLINARY PHYSICS AND RELATED AREAS OF SCIENCE AND TECHNOLOGY • 上一篇    下一篇

Terahertz coherent detection via two-color laser pulses of various frequency ratios

Xin-Yang Gu(顾新杨), Ke-Jia Wang(王可嘉), Zhen-Gang Yang(杨振刚), Jin-Song Liu(刘劲松)   

  1. 1 Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology, Wuhan 430074, China;
    2 School of Optical and Electronic Information, Huazhong University of Science and Technology, Wuhan 430074, China
  • 收稿日期:2019-06-18 修回日期:2019-07-11 出版日期:2019-09-05 发布日期:2019-09-05
  • 通讯作者: Jin-Song Liu E-mail:jsliu4508@vip.sina.com
  • 基金资助:

    Project supported by the National Natural Science Foundation of China (Grant Nos. 11574105, 61475054, and 61405063).

Terahertz coherent detection via two-color laser pulses of various frequency ratios

Xin-Yang Gu(顾新杨)1, Ke-Jia Wang(王可嘉)1, Zhen-Gang Yang(杨振刚)2, Jin-Song Liu(刘劲松)1   

  1. 1 Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology, Wuhan 430074, China;
    2 School of Optical and Electronic Information, Huazhong University of Science and Technology, Wuhan 430074, China
  • Received:2019-06-18 Revised:2019-07-11 Online:2019-09-05 Published:2019-09-05
  • Contact: Jin-Song Liu E-mail:jsliu4508@vip.sina.com
  • Supported by:

    Project supported by the National Natural Science Foundation of China (Grant Nos. 11574105, 61475054, and 61405063).

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 2n, 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.

关键词: terahertz, gas plasma, coherent detection, photoionization

Abstract:

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 2n, 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.

Key words: terahertz, gas plasma, coherent detection, photoionization

中图分类号: 

  • 87.50.U-
52.25.Jm (Ionization of plasmas) 78.47.jh (Coherent nonlinear optical spectroscopy) 87.15.mn (Photoionization)