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

We have conducted spectroscopy of broadband terahertz (THz) pulses 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.