Ultra?Broadband and High?Dynamic?Range THz Time?Domain Spectroscopy System Based on Organic Crystal Emitter and Detector in Transmission and Reflection Geometry

The terahertz range of the electromagnetic spectrum reveals important insights when studying material properties. An ultra-broadband time-domain spectroscopy system based on state-of-the-art, high-stability organic nonlinear optical crystals used as both THz wave generator and detector is presented. In transmission geometry, a broad exceeding 20 high dynamic more than 80 dB achieved using compact 100 MHz femtosecond laser working at telecom wavelength 1560 nm. normal-incidence reflection similar bandwidth with surpassing 60 reported. experimental results are supported by complete theoretical model, which includes pump pulse duration, phonon/vibrational modes optical/THz beam path optimizations. effectiveness newly developed demonstrated measuring pharmaceutical samples distinct features in narrow water vapor lines spectral resolution 2.7 GHz (0.090 cm?1), resulting an excellent accuracy frequency deviation less 0.05% from reference values.