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Proceedings Paper

Low threshold and high efficiency solar-pumped laser with Fresnel lens and a grooved Nd:YAG rod
Author(s): Zhe Guan; Changming Zhao; Suhui Yang; Yu Wang; Jieyao Ke; Fengbin Gao; Haiyang Zhang
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Paper Abstract

Sunlight is considered as a new efficient source for direct optical-pumped solid state lasers. High-efficiency solar pumped lasers with low threshold power would be more promising than semiconductor lasers with large solar panel in space laser communication. Here we report a significant advance in solar-pumped laser threshold by pumping Nd:YAG rod with a grooved sidewall. Two-solar pumped laser setups are devised. In both cases, a Fresnel lens is used as the primary sunlight concentrator. Gold-plated conical cavity with a liquid light-guide lens is used as the secondary concentrator to further increase the solar energy concentration. In the first setup, solar pumping a 6mm diameter Nd:YAG rod, maximum laser power of 31.0W/m2 cw at 1064nm is produced, which is higher than the reported record, and the slope efficiency is 4.98% with the threshold power on the surface of Fresnel lens is 200 W. In the second setup, a 5 mm diameter laser rod output power is 29.8W/m2 with a slope efficiency of 4.3%. The threshold power of 102W is obtained, which is 49% lower than the former. Meanwhile, the theoretical calculating of the threshold power and slope efficiency of the solar-pumped laser has been established based on the rate-equation of a four-level system. The results of the finite element analysis by simulation software are verified in experiment. The optimization of the conical cavity by TracePro© software and the optimization of the laser resonator by LASCAD© are useful for the design of a miniaturization solar- pumped laser.

Paper Details

Date Published: 9 November 2016
PDF: 9 pages
Proc. SPIE 10016, High-Power Lasers and Applications VIII, 1001609 (9 November 2016); doi: 10.1117/12.2245281
Show Author Affiliations
Zhe Guan, Beijing Institute of Technology (China)
Changming Zhao, Beijing Institute of Technology (China)
Suhui Yang, Beijing Institute of Technology (China)
Yu Wang, Beijing Institute of Technology (China)
Jieyao Ke, Beijing Institute of Technology (China)
Fengbin Gao, Beijing Institute of Technology (China)
Haiyang Zhang, Beijing Institute of Technology (China)

Published in SPIE Proceedings Vol. 10016:
High-Power Lasers and Applications VIII
Ruxin Li; Upendra N. Singh; Robert F. Walter, Editor(s)

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