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Multimilliwatt pulsed terahertz-wave source pumped by dual fiber lasers for imaging application
Author(s): Yoshio Wada; Takumi Satoh; Yasuhiro Higashi; Yoshiharu Urata
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Paper Abstract

Difference frequency generation (DFG) is one of the most important methods for obtaining monochromatic THz-wave radiation, with the advantages of simplicity, lack of a threshold, room-temperature operation, and wide-range tunability. We previously demonstrated a milliwatt single-longitudinal-mode and tunable THz-wave source based on DFG in a MgO:LiNbO3 (MgO:LN) crystal using a pair of Yb-doped, pulsed fiber lasers [Y. Wada et al., Proc. SPIE 10531, 1053107- 8 (2018)]. In this study, we report the improvement of the THz-wave source by optimizing the collimation optics for THz output and enhancing the pumping fiber laser sources. The modified source produces an average power of 3.6 mW and a peak power greater than 7 W with nanosecond pulses at a pulse repetition frequency of 500 kHz and a tunability range from 0.34 to 1.25 THz. This improved source enables nondestructive 2-D transmission imaging of objects behind materials as thick as 5 mm using a pyroelectric detector operated at room temperature. As a demonstration of our powerful THz source, we present some results of transmission imaging of a train pass and thin objects such as an optical fiber and a human hair. We also demonstrate the direct spectroscopic imaging of medicine tablets.

Paper Details

Date Published: 1 March 2019
PDF: 10 pages
Proc. SPIE 10917, Terahertz, RF, Millimeter, and Submillimeter-Wave Technology and Applications XII, 109170W (1 March 2019); doi: 10.1117/12.2509324
Show Author Affiliations
Yoshio Wada, Ricoh Co., Ltd. (Japan)
Takumi Satoh, Ricoh Co., Ltd. (Japan)
Yasuhiro Higashi, Ricoh Co., Ltd. (Japan)
Yoshiharu Urata, PHLUXi, Inc. (Japan)

Published in SPIE Proceedings Vol. 10917:
Terahertz, RF, Millimeter, and Submillimeter-Wave Technology and Applications XII
Laurence P. Sadwick; Tianxin Yang, Editor(s)

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