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Proceedings Paper

High-repetition-rate, widely tunable terahertz generation in GaSe pumped by a dual-wavelength KTP-OPO
Author(s): Dexian Yan; Degang Xu; Yuye Wang; Wei Shi; Kai Zhong; Pengxiang Liu; Chao Yan; Quan Sheng; Jialin Mei; Jia Shi; Jianquan Yao
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Paper Abstract

High-repetition-rate, monochromatic and tunable terahertz (THz) source is demonstrated. We use an orthogonally polarized dual-wavelength intracavity OPO to complete the type-II phase-matched collinear difference-frequency generation in GaSe. A high average-power 2 μm laser with 12 W output power and good beam quality based on an intracavity KTP OPO is experimentally designed. The KTP OPO is intracavity pumped by an acousto-optical Q-switched side-pumped Nd:YAG with the repetition rate of 10 kHz. Two identical KTP crystals were 7 × 8 × 15 mm3 in size, cut at θ = 51.2°, φ = 0°, which were tuned in the x-z plane to achieve type-II phase-matching. The KTP OPO consists of two identical KTP crystals to reduce the walk-off effect and improve the beam overlap area of the output signal and idler waves. The pulse-width of the 2-μm KTP OPO laser is about 11 ns with the linewidth about 0.8 nm. The focused OPO beam is injected into the uncoated GaSe with the length of 8 mm, and the generated THz wave is detected with a 4.2-K Si-bolometer after focusing with a polyethylene lens. The tunable and coherent radiation from 0.2 to 3 THz has been achieved based on the type-II phase-matching DFG when the two pump waves are in the range of 2.1064 - 2.1272 μm and 2.1516 - 2.1304 μm while symmetrically tuning the phase-matching angle of the KTPs. The maximum output THz average power can reach μW-level around 1.48 THz.

Paper Details

Date Published: 3 November 2016
PDF: 7 pages
Proc. SPIE 10030, Infrared, Millimeter-Wave, and Terahertz Technologies IV, 100300B (3 November 2016); doi: 10.1117/12.2245522
Show Author Affiliations
Dexian Yan, Tianjin Univ. (China)
Degang Xu, Tianjin Univ. (China)
Yuye Wang, Tianjin Univ. (China)
Wei Shi, Tianjin Univ. (China)
Kai Zhong, Tianjin Univ. (China)
Pengxiang Liu, Tianjin Univ. (China)
Chao Yan, Tianjin Univ. (China)
Quan Sheng, Tianjin Univ. (China)
Jialin Mei, Tianjin Univ. (China)
Jia Shi, Tianjin Univ. (China)
Jianquan Yao, Tianjin Univ. (China)

Published in SPIE Proceedings Vol. 10030:
Infrared, Millimeter-Wave, and Terahertz Technologies IV
Cunlin Zhang; Xi-Cheng Zhang; Masahiko Tani, Editor(s)

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