采用光纤飞秒激光器与光纤耦合型太赫兹光电导天线相结合的方案,设计并研制了光纤型太赫兹时域光谱系统。通过实验研究了激光偏振态对太赫兹时域波形、强度以及光谱特性的影响,通过对飞秒激光偏振态的精确控制与优化,消除了时域脉冲分裂现象,获得了高信噪比的单脉冲太赫兹时域波形。

A fiber-type terahertz (THz) time-domain spectrometer is designed by combining a fiber femtosecond laser with a fiber-coupled THz photoconductive antenna. The effect of laser polarization on the THz time-domain waveform, intensity, and spectral characteristics are studied experimentally. Via the precise control and the optimization of the polarization state of the femtosecond laser, the time-domain pulse splitting is eliminated, and a single-peak THz time-domain pulse with a high signal-to-noise ratio is obtained.