Real-time gas density measurement using a ring cavity terahertz parametric oscillator

S. Ohno; R. Guo; H. Minamide; H. Ito

doi:10.1117/12.722706

8 May 2007 Real-time gas density measurement using a ring cavity terahertz parametric oscillator

S. Ohno, R. Guo, H. Minamide, H. Ito

Proceedings Volume 6582, Nonlinear Optics and Applications II; 65821G (2007) https://doi.org/10.1117/12.722706
Event: International Congress on Optics and Optoelectronics, 2007, Prague, Czech Republic

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.

Citation Download Citation

S. Ohno, R. Guo, H. Minamide, and H. Ito "Real-time gas density measurement using a ring cavity terahertz parametric oscillator", Proc. SPIE 6582, Nonlinear Optics and Applications II, 65821G (8 May 2007); https://doi.org/10.1117/12.722706

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