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Proceedings Paper

Real-time gas density measurement using a ring cavity terahertz parametric oscillator
Author(s): S. Ohno; R. Guo; H. Minamide; H. Ito
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Paper Abstract

We carried out real-time measurement of gas density using monochromatic terahertz waves. The THz-wave absorbance is useful to measure the density of a gas having a characteristic spectrum in the THz region. We used the ring cavity THz-wave parametric oscillator (ring-TPO) as a monochromatic tunable THz-wave source. One can change the oscillation frequency of ring-TPO with a rotating galvano mirror forming the ring cavity. The frequency can be changed by synchronization with a repeating pump-pulse of 500 Hz. We demonstrated real-time measurement of the gas density in R-22, which had some spectral structure in THz frequency region. The gas density in the sample cell was changed by controlling the pressure to lower than 1 atm. When the gas density in the cell was the most tenuous, the maximum sensitivity was about 5%, which was limited by the fluctuation of THz-wave intensity.

Paper Details

Date Published: 8 May 2007
PDF: 8 pages
Proc. SPIE 6582, Nonlinear Optics and Applications II, 65821G (8 May 2007); doi: 10.1117/12.722706
Show Author Affiliations
S. Ohno, RIKEN Sendai (Japan)
R. Guo, RIKEN Sendai (Japan)
H. Minamide, RIKEN Sendai (Japan)
H. Ito, RIKEN Sendai (Japan)
RIEC Tohoku Univ. (Japan)

Published in SPIE Proceedings Vol. 6582:
Nonlinear Optics and Applications II
Mario Bertolotti, Editor(s)

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