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Proceedings Paper

Compact high-repetition-rate terahertz source based on difference frequency generation from an efficient 2-μm dual-wavelength KTP OPO
Author(s): Jialin Mei; Kai Zhong; Maorong Wang; Pengxiang Liu; Degang Xu; Yuye Wang; Wei Shi; Jianquan Yao; Robert A. Norwood; Nasser Peyghambarian
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Paper Abstract

A compact optical terahertz (THz) source was demonstrated based on an efficient high-repetition-rate doubly resonant optical parametric oscillator (OPO) around 2 μm with two type-II phase-matched KTP crystals in the walk-off compensated configuration. The KTP OPO was intracavity pumped by an acousto-optical (AO) Q-switched Nd:YVO4 laser and emitted two tunable wavelengths near degeneracy. The tuning range extended continuously from 2.068 μm to 2.191 μm with a maximum output power of 3.29 W at 24 kHz, corresponding to an optical-optical conversion efficiency (from 808 nm to 2 μm) of 20.69%. The stable pulsed dual-wavelength operation provided an ideal pump source for generating terahertz wave of micro-watt level by the difference frequency generation (DFG) method. A 7.84-mm-long periodically inverted quasi-phase-matched (QPM) GaAs crystal with 6 periods was used to generate a terahertz wave, the maximum voltage of 180 mV at 1.244 THz was acquired by a 4.2-K Si bolometer, corresponding to average output power of 0.6 μW and DFG conversion efficiency of 4.32×10-7. The acceptance bandwidth was found to be larger than 0.35 THz (FWHM). As to the 15-mm-long GaSe crystal used in the type-II collinear DFG, a tunable THz source ranging from 0.503 THz to 3.63 THz with the maximum output voltage of 268 mV at 1.65 THz had been achieved, and the corresponding average output power and DFG conversion efficiency were 0.9 μW and 5.86×10-7 respectively. This provides a potential practical palm-top tunable THz sources for portable applications.

Paper Details

Date Published: 3 November 2016
PDF: 6 pages
Proc. SPIE 10030, Infrared, Millimeter-Wave, and Terahertz Technologies IV, 100301Q (3 November 2016); doi: 10.1117/12.2245692
Show Author Affiliations
Jialin Mei, Tianjin Univ. (China)
Key Lab. of Opto-Electronics Information Technology (China)
Kai Zhong, Tianjin Univ. (China)
Key Lab. of Opto-Electronics Information Technology (China)
Maorong Wang, Tianjin Univ. (China)
Key Lab. of Opto-Electronics Information Technology (China)
Pengxiang Liu, Tianjin Univ. (China)
Key Lab. of Opto-Electronics Information Technology (China)
Degang Xu, Tianjin Univ. (China)
Key Lab. of Opto-Electronics Information Technology (China)
Yuye Wang, Tianjin Univ. (China)
Key Lab. of Opto-Electronics Information Technology (China)
Wei Shi, Tianjin Univ. (China)
Key Lab. of Opto-Electronics Information Technology (China)
Jianquan Yao, Tianjin Univ. (China)
Key Lab. of Opto-Electronics Information Technology (China)
Robert A. Norwood, College of Optical Sciences, The Univ. of Arizona (United States)
Nasser Peyghambarian, College of Optical Sciences, The Univ. of Arizona (United States)


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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