研究目的
To develop a THz frequency-domain differential absorption spectrometer for gas sensing applications using a multi-furcated Nd:YAG microchip laser.
研究成果
The developed THz differential absorption gas sensing system using a multi-furcated Nd:YAG laser demonstrates the capability for fast differential absorption measurements and derivative spectroscopy of gaseous species in the atmosphere, suitable for the realization of a THz-DIAL system.
研究不足
The measured absorption bandwidth was broadened due to the linewidth of the sub-nanosecond THz-wave pulses.
1：Experimental Design and Method Selection:
The system is based on an injection-seeded THz-wave parametric generator (is-TPG) with a MgO-doped LiNbO3 crystal, driven by a spectral multi-furcated Nd:YAG microchip laser.
2：Sample Selection and Data Sources:
The target is water vapor in the atmosphere.
3：List of Experimental Equipment and Materials:
Injection-seeded THz-wave parametric generator, multi-furcated Nd:YAG microchip laser, MgO-doped LiNbO3 crystal, Schottky barrier diode (SBD) detector, 100-MHz analog-to-digital converter.
4：Experimental Procedures and Operational Workflow:
The laser produces three Q-switched pulses with a frequency separation of 11 GHz within a single QCW excitation cycle. The THz-wave pulses are detected using an SBD detector.
5：Data Analysis Methods:
The differential absorption spectra are obtained by subtracting the intensity of the pulses and comparing with simulated spectra from the HITRAN2012 database.
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