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Proceedings Paper

Externally triggered imaging technique for microbolometer-type terahertz imager
Author(s): Naoki Oda; Takayuki Sudou; Tsutomu Ishi; Syuichi Okubo; Goro Isoyama; Akinori Irizawa; Keigo Kawase; Ryukou Kato
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Paper Abstract

The authors developed terahertz (THz) imager which incorporates 320x240 focal plane array (FPA) with enhanced sensitivity in sub-THz region (ca. 0.5 THz). The imager includes functions such as external-trigger imaging, lock-in imaging, beam profiling and so on. The function of the external-trigger imaging is mainly described in this paper, which was verified in combination of the THz imager with the pulsed THz free electron laser (THz-FEL) developed by Osaka University.

The THz-FEL emits THz radiation in a wavelength range of 25 - 150 μm at repetition rates of 2.5, 3.3, 5.0 and 10 pulses per second. The external trigger pulse for the THz imager was generated with a pulse generator, using brightening pulse for THz-FEL. A series of pulses emitted by the THz-FEL at 86 μm were introduced to the THz imager and Joule meter via beam splitter, so that the output signal of THz imager was normalized with the output of the Joule meter and the stability of the THz radiation from FEL was also monitored. The normalized output signals of THz imager (digits/μJ) obtained at the repetition rates mentioned above were found consistent with one another. The timing-relation of the external trigger pulse to the brightening pulse was varied and the influence of the timing-relation on beam pattern is presented. These experimental results verify that the external trigger imaging function operates correctly.

Paper Details

Date Published: 29 April 2016
PDF: 9 pages
Proc. SPIE 9856, Terahertz Physics, Devices, and Systems X: Advanced Applications in Industry and Defense, 98560I (29 April 2016); doi: 10.1117/12.2222292
Show Author Affiliations
Naoki Oda, NEC Corp. (Japan)
Takayuki Sudou, Nippon Avionocs Co., Ltd. (Japan)
Tsutomu Ishi, NEC Corp. (Japan)
Syuichi Okubo, Nippon Avionics Co., Ltd. (Japan)
Goro Isoyama, Osaka Univ. (Japan)
Akinori Irizawa, Osaka Univ. (Japan)
Keigo Kawase, Osaka Univ. (Japan)
Ryukou Kato, High Energy Accelerator Research Organization (Japan)

Published in SPIE Proceedings Vol. 9856:
Terahertz Physics, Devices, and Systems X: Advanced Applications in Industry and Defense
Mehdi F. Anwar; Thomas W. Crowe; Tariq Manzur, Editor(s)

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