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

doi:10.1088/1674-1056/ab37fc

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.

Keywords: terahertz gas plasma coherent detection photoionization

Received: 18 June 2019
Revised: 11 July 2019
Accepted manuscript online:

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

Fund:

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

Corresponding Authors: Jin-Song Liu
E-mail: jsliu4508@vip.sina.com

Cite this article:

Xin-Yang Gu(顾新杨), Ke-Jia Wang(王可嘉), Zhen-Gang Yang(杨振刚), Jin-Song Liu(刘劲松) Terahertz coherent detection via two-color laser pulses of various frequency ratios 2019 Chin. Phys. B 28 098701

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

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