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.
We developed an active gas sensing system with a highly- sensitive sub-terahertz (THz) wave receiver consisting of a
superconductor-insulator-superconductor mixer and a photonics-based THz-wave local oscillator. Continuous
monitoring of the gas contents in the gas cell was successfully carried out with the developed system. The high
sensitivity of the developed THz-wave receiver makes it possible to extend the detection range up to 30 m.
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