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Proceedings Paper

Optical fiber pumping of solar Nd:YAG disc laser
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Paper Abstract

Incoming solar energy is firstly collected 137 small parabolic mirrors, 180mm in diameter, 210mm in focal length and then coupled by 137 optical fibers with 2mm in diameter each, to a diffusion bounded thin-disk Nd:YAG laser material. The flexibility of optical fiber allows the placement of laser cavity in a convenient place away from the solar collection mirrors. The conical polishing of the fiber output sections permits further enhancement of pump light absorption by the Nd:YAG thin-disk, diffusion bounded to an undoped YAG cap with 80mm maximum diameter. For optimal pumping condition with 1.8mm diameter polished tip, 20W laser power was numerically calculated, corresponding to a collection efficiency of 5.9 W/m2. M2 factors of Mx2=88.5 and My2=89.4 were also attained, indicating an almost symmetrical absorption profile. The proposed scheme can provide a solution to the thermal problems that has plagued the solarpumped lasers for many years.

Paper Details

Date Published: 26 July 2011
PDF: 6 pages
Proc. SPIE 8001, International Conference on Applications of Optics and Photonics, 80014D (26 July 2011); doi: 10.1117/12.892249
Show Author Affiliations
Bruno do Couto, Univ. Nova de Lisboa (Portugal)
Dawei Liang, Univ. Nova de Lisboa (Portugal)

Published in SPIE Proceedings Vol. 8001:
International Conference on Applications of Optics and Photonics
Manuel Filipe Costa, Editor(s)

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