Effect of relative phase of two-color femtosecond pulses on terahertz spectral characteristics driven by plasma

ZHAO Zehua; SUN Wenfeng; WANG Xinke; FENG Shengfei; YE Jiasheng; HAN Peng; HE Zehao; ZHANG Yan

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Effect of relative phase of two-color femtosecond pulses on terahertz spectral characteristics driven by plasma

Terahertz Technology | 更新时间：2026-03-24

- Effect of relative phase of two-color femtosecond pulses on terahertz spectral characteristics driven by plasma
- OPTICAL TECHNIQUE Vol. 52, Issue 2, Pages: 199-202(2026)
- 作者机构：
  
  超材料与器件北京市重点实验室，首都师范大学物理系，北京 10048
- 作者简介：
- 基金信息：
- DOI：
  CLC： O433;O437;O536;TN29
- Received：19 December 2025，
  
  Revised：2025-12-30，
  
  Published：20 March 2026
- 稿件说明：
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赵泽华,孙文峰,王新柯等.双色场的相对相位对等离子体辐射太赫兹波频谱特性的影响[J].光学技术,2026,52(02):199-202.

ZHAO Zehua,SUN Wenfeng,WANG Xinke,et al.Effect of relative phase of two-color femtosecond pulses on terahertz spectral characteristics driven by plasma[J].OPTICAL TECHNIQUE,2026,52(02):199-202.
赵泽华,孙文峰,王新柯等.双色场的相对相位对等离子体辐射太赫兹波频谱特性的影响[J].光学技术,2026,52(02):199-202. DOI：

ZHAO Zehua,SUN Wenfeng,WANG Xinke,et al.Effect of relative phase of two-color femtosecond pulses on terahertz spectral characteristics driven by plasma[J].OPTICAL TECHNIQUE,2026,52(02):199-202. DOI：

摘要

双色飞秒激光脉冲驱动空气等离子体的太赫兹波辐射因其高辐射效率、超宽带及高损伤阈值等优势，成为产生太赫兹波的重要手段之一。双色场中基频光与二次谐波之间的相对相位对辐射太赫兹波性能具有重要作用。通过改变倍频晶体与几何焦点之间的距离，研究了基频光与倍频光之间的相对相位对辐射太赫兹波峰值频率的影响。实验结果表明，太赫兹波峰值频率随倍频晶体与几何焦点之间的距离呈周期性变化规律，在实验测量范围内其值在0.85~1.29THz区间内变化。基于光电流模型和ADK电离理论，对相对相位与太赫兹辐射峰值频率之间的关系进行了分析，理论模拟与实验结果符合较好。研究结果为构建无需额外相位补偿器的可调谐太赫兹源提供了新的技术途径。

Abstract

Terahertz wave radiation driven by two-color femtosecond laser pulses in air plasmas has become one of the important ways for generating THz waves

owing to its high radiation efficiency

ultra-broadband characteristics

and high damage threshold. The relative phase between the fundamental and second-harmonic components of the two-color field plays a critical role in determining the performance of the emitted THz radiation. By adjusting the distance between the second-harmonic generation crystal and the geometric focus

this work investigates how the relative phase between the fundamental and second-harmonic lights influences the peak frequency of the emitted terahertz wave. Experimental results show that the peak frequency of the THz wave varies periodically with the distance between the second harmonic generation crystal and the geometric focus

ranging from 0.85 to 1.29 THz within the experimental measurement range. Based on the photo-current model and ADK ionization theory

the relationship between the relative phase and the peak frequency of THz radiation was analyzed. The theoretical simulation and experimental results are in good agreement. These findings provide a new technical approach for the development of tunable THz sources without the need for additional phase compensators.

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references

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