A comparative study of THz spectra

We have constructed two types of THz spectrometers using the frequency-tunable THz wave generators based on difference-frequency generation (DFG) in GaP crystal. The OPO-source system is for high accuracy measurement to detect fine structures in THz absorption spectra. The Cr:F-source system has mer...

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Bibliographic Details
Published in:Proceedings of the Japan Academy, Series B Series B, 2005, Vol.81(1), pp.20-25
Main Authors: NISHIZAWA, Jun-ichi, SUTO, Ken, SASAKI, Tetsuo, TANNO, Takenori
Format: Article
Language:English
Subjects:
GaP
LiNbO3
spectrometer
sweep-generator
Terahertz
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Summary:We have constructed two types of THz spectrometers using the frequency-tunable THz wave generators based on difference-frequency generation (DFG) in GaP crystal. The OPO-source system is for high accuracy measurement to detect fine structures in THz absorption spectra. The Cr:F-source system has merit in simple structure, easy maintenance and low-cost, but still has sufficient resolution for room temperature observation of solids or liquids. Comparing the absorption spectra of saccharides measured with these spectrometers and those measured with FT-IR or TDS, our spectrometers have superiority in frequency range and resolution, enough to record sub peaks, which can be analyzed as structural defects in organic compounds. (Contributed by NISHIZAWA, Jun-ichi, M.J.A.)
ISSN:0386-2208
1349-2896
DOI:10.2183/pjab.81.20