Jingguo Huang, Yang Li, Yanqing Gao, Gaofang Li, Zhiming Huang, Junhao Chu, Yury Andreev
https://www.spiedigitallibrary.org/conference-proceedings-of-spie/11046/1104631/High-efficient-terahertz-generation-from-cryogenic-gallium-phosphide-based-on/10.1117/12.2524100.short?SSO=1
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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