Optical fiber pumping of solar Nd:YAG disc laser

Bruno do Couto; Dawei Liang

doi:10.1117/12.892249

26 July 2011 Optical fiber pumping of solar Nd:YAG disc laser

Bruno do Couto, Dawei Liang

Proceedings Volume 8001, International Conference on Applications of Optics and Photonics; 80014D (2011) https://doi.org/10.1117/12.892249
Event: International Conference on Applications of Optics and Photonics, 2011, Braga, Portugal

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 M_x2=88.5 and M_y2=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.

Citation Download Citation

Bruno do Couto and Dawei Liang "Optical fiber pumping of solar Nd:YAG disc laser", Proc. SPIE 8001, International Conference on Applications of Optics and Photonics, 80014D (26 July 2011); https://doi.org/10.1117/12.892249

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KEYWORDS

Optical fibers

Mirrors

Nd:YAG lasers

Solar energy

YAG lasers

Absorption

Disk lasers

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