Influence of Laser Energy on Terahertz Radiation from Gas Plasma

Si-qing WU; Bo SHEN; Gang XIONG; Jiang-hua LIU

doi:10.37188/fgxb20204107.0873

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Influence of Laser Energy on Terahertz Radiation from Gas Plasma

Luminescence Applications and Interdisciplinary Fields | 更新时间：2020-09-10

- Influence of Laser Energy on Terahertz Radiation from Gas Plasma
- Chinese Journal of Luminescence Vol. 41, Issue 7, Pages: 873-877(2020)
- 作者机构：
  
  1.湖北科技学院电子与信息工程学院, 湖北咸宁 437100
  2.华中科技大学武汉光电国家研究中心, 湖北武汉 430074
- 作者简介：
- 基金信息：
  
  Supported by Science and Technology Planning Project of Hubei Province
- DOI：10.37188/fgxb20204107.0873
  CLC：
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Si-qing WU, Bo SHEN, Gang XIONG, et al. Influence of Laser Energy on Terahertz Radiation from Gas Plasma. [J]. Chinese Journal of Luminescence 41(7):873-877(2020)
DOI：

Si-qing WU, Bo SHEN, Gang XIONG, et al. Influence of Laser Energy on Terahertz Radiation from Gas Plasma. [J]. Chinese Journal of Luminescence 41(7):873-877(2020) DOI： 10.37188/fgxb20204107.0873.

摘要

双色激光脉冲激励气体等离子体产生太赫兹波是得到高强度宽频带太赫兹波的重要方法，本文利用光电流模型研究了该方法中激光能量对产生太赫兹波的影响。理论计算表明，太赫兹波随激光能量的增大而增强，而太赫兹波的频谱结构不受激光能量的影响。分析了双色激光能量影响太赫兹波强度的原因，并利用自由电子浓度和电子电流密度诠释了该影响的内在物理机制。该研究为提高太赫兹辐射强度提供了一种有效的途径。

Abstract

It is an important method to obtain high intensity and broadband terahertz (THz) wave utilizing gas plasma excited by two-color laser pulses, and this paper has studied the influence of laser energy on THz radiation in the method on the basis of the transient photocurrent model. Theoretical calculation proves that THz wave will increase with the increase of laser energy, but the distribution of THz spectrum will not change with the variation of laser energy. Furthermore, the reason of laser energy affecting THz wove is analyzed, and the physical mechanism of this influence is explained by calculating the free electrons centration and drift current density. This study provides an effective way to improve the intensity of THz radiation.

关键词

飞秒激光脉冲太赫兹波气体等离子体光电流模型

Keywords

femtosecond laser pulseterahertz wavegas plasmaphotocurrent model

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Institute of Modern Optics, Nankai University, Tianjin 300071, China

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