High-resolution Spectroscopy using a Ring-Cavity THz-Wave Parametric Oscillator and a Fabry-Perot Interferometer

摘要

Using a ring-cavity terahertz (THz)-wave parametric oscillator as a THz-wave source, we demonstrated THz-wave absorption spectroscopy in water vapor. The THz-wave was fed into a Fabry-Perot interferometer to obtain a narrower spectral line width than that supplied by the source.