太赫兹空气相干探测技术引起的太赫兹脉冲畸变

Distortions of terahertz pulses induced by the air coherent detection technique

太赫兹空气相干探测技术是一种宽带探测技术,目前已被广泛应用于宽带太赫兹技术中。该技术的频率响应由探测激光脉冲宽度决定。因此,不同的探测激光脉冲在探测过程可能引起太赫兹脉冲的畸变。本文基于数值计算研究了空气相干探测技术引起的太赫兹脉冲的脉冲畸变和能量损失。结果显示,这种脉冲畸变和能量损失主要依赖探测激光脉冲宽度和待探测的太赫兹脉冲的中心频率。本项工作对于估测在宽带太赫兹技术中使用空气相干探测技术的性能和表现有很好的帮助。

Terahertz air coherent detection technique is a broadband detection method,which has been widely used in the broadband terahertz technology after its demonstration in the experiment.The frequency response of this method is determined by the duration of the probe laser pulse.Thus,the different probe lasers might induce distortions of terahertz pulses during the detection process.In this paper,the distortions and the energy loss of the terahertz pulses induced by the air coherent detection technique are quantitatively investigated based on the simula⁃tions.The results show that the pulse distortions and the energy loss depend on the duration of the probe laser pulse and the central frequency of terahertz pulse to be detected.This work will help to estimate the influence of the air coherent detection technique in the broadband terahertz technology.