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18 February 2010 Optically synchronized dual-channel terahertz signals for high-performance transmitter/receiver system
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Abstract
We developed a high-sweeping-speed optically synchronized dual-channel terahertz signal generator, in which the frequency difference between the two terahertz signals is independent of the frequency of the terahertz signals themselves. This feature is essential for heterodyne detection of terahertz signals with various frequencies. With this generator, a frequency-sweepable terahertz transmitter (Tx)/receiver (Rx) system with a wide dynamic range can be realized without sacrificing the high frequency-sweeping speed. Absorption line measurements for water vapor and nitrous oxide show that the developed Tx/Rx system can detect gas absorption with the optical depth of 0.04 or less. This result indicates the potential of the system as a remote gas sensor and gas analyzer.
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Naofumi Shimizu, Kyoung-Hwan Oh, Satoshi Kohjiro, Ken'ichi Kikuchi, Atsushi Wakatsuki, Naoya Kukutsu, and Yuichi Kado "Optically synchronized dual-channel terahertz signals for high-performance transmitter/receiver system", Proc. SPIE 7601, Terahertz Technology and Applications III, 76010D (18 February 2010); https://doi.org/10.1117/12.840637
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