| 激光能量对气体等离子体产生太赫兹波的影响 |
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| 引用本文： | 吴四清,沈波,熊钢,刘江华.激光能量对气体等离子体产生太赫兹波的影响[J].发光学报,2020(7):873-877. |
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| 作者姓名： | 吴四清 沈波 熊钢 刘江华 |
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| 作者单位： | 湖北科技学院电子与信息工程学院;华中科技大学武汉光电国家研究中心 |
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| 基金项目： | 湖北省科技计划项目(2019CFC879)资助。 |
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| 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。
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| 关 键 词： | 飞秒激光脉冲 太赫兹波 气体等离子体 光电流模型 |
Influence of Laser Energy on Terahertz Radiation from Gas Plasma |
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| WU Si-qing,SHEN Bo,XIONG Gang,LIU Jiang-hua.Influence of Laser Energy on Terahertz Radiation from Gas Plasma[J].Chinese Journal of Luminescence,2020(7):873-877. |
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| Authors: | WU Si-qing SHEN Bo XIONG Gang LIU Jiang-hua |
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| Institution: | (School of Electronic and Information Engineering, Hubei University of Science & Technology, Xianning 437100, China;Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology, Wuhan 430074, China) |
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| 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. |
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| Keywords: | femtosecond laser pulse terahertz wave gas plasma photocurrent model |
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