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29 March 2019 High efficient terahertz generation from cryogenic gallium phosphide based on collinear difference frequency
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Proceedings Volume 11046, Fifth International Symposium on Laser Interaction with Matter; 1104631 (2019) https://doi.org/10.1117/12.2524100
Event: Fifth International Symposium on Laser Interaction with Matter, 2018, Changsha, China
Abstract
In this paper, a high efficient terahertz source based on n-type gallium phosphide crystal via cryogenic process is investigated through collinear difference frequency generation pumper by 1064 nm Nd:YAG laser and its OPO system. Absorption coefficient of this crystal at THz range shows a dramatic decrease from ~ 50 cm-1 to 0.5 cm--1 as the temperature decreases from 300 k to 80 k. Four times enhancement of the terahertz emission power and much more broad spectra range (~ 0.2- 3.8 THz) has been achieved in this kind of 0.5 mm length gallium phosphide crystal during the whole varied temperature difference frequency generation from 300 k to 80 k. These results indicate that cooling down the crystal temperature is an effective way to improve the terahertz source property, such as terahertz output power and frequency range.
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Jingguo Huang, Yang Li, Yanqing Gao, Gaofang Li, Zhiming Huang, Junhao Chu, and Yury Andreev "High efficient terahertz generation from cryogenic gallium phosphide based on collinear difference frequency", Proc. SPIE 11046, Fifth International Symposium on Laser Interaction with Matter, 1104631 (29 March 2019); https://doi.org/10.1117/12.2524100
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