Single-shot up-conversion terahertz spectrometer with high frequency resolution

We have successfully conducted spectroscopy of broadband terahertz (THz) pulse produced by femtosecond lasers via THz parametric detection. Conventional techniques for detecting broadband THz-waves have predominantly relied on time-domain waveform sampling through THz time-domain spectroscopy (THz-TDS), where challenges persist in achieving real-time performance and optimal frequency resolution. To address these issues, we have implemented THz parametric detection, wherein THz-waves are converted to near-infrared light, facilitating one-shot spectroscopy of broadband THz-waves. In addition, the frequency resolution of this method has been improved by adopting a non-collinear phase matching condition.