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20 August 2020 Injection-seeded THz parametric generator, detector, and application
Kosuke Murate, Kodo Kawase
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Proceedings Volume 11499, Terahertz Emitters, Receivers, and Applications XI; 114990F (2020) https://doi.org/10.1117/12.2568219
Event: SPIE Optical Engineering + Applications, 2020, Online Only
Abstract
We have been developing an injection-seeded terahertz (THz) parametric generator (is-TPG), detector, and amplifier. This THz generation and detection scheme have allowed us to develop a wide-dynamic range THz wave spectrometer which can be used for nondestructive inspection of illicit drugs under thick envelopes. In this work, we have improved the sensitivity of the THz parametric detector drastically using a multistage configuration, which consists of the up-conversion (pre-amplifier) and the main amplifier parts. Using this new configuration, we were able to suppress the broadband noise, and only an upconverted detection beam can be measured using the NIR detector. As a result of this improvement, the minimum sensitivity reached 130 zJ (zJ=10-21J), which equals to about 90 photons at 1.05 THz. Moreover, the principle of this multistage detection can be used for high gain THz amplification which has more than 6 billion-fold amplification factor.
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Kosuke Murate and Kodo Kawase "Injection-seeded THz parametric generator, detector, and application", Proc. SPIE 11499, Terahertz Emitters, Receivers, and Applications XI, 114990F (20 August 2020); https://doi.org/10.1117/12.2568219
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KEYWORDS
Terahertz radiation
Sensors
Imaging spectroscopy
Imaging systems
Near infrared
Spectroscopy
Amplifiers
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