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Proceedings Paper

Solar-pumped fiber laser with transverse-excitation geometry
Author(s): Taizo Masuda; Mitsuhiro Iyoda; Yuta Yasumatu; Tomohiro Yamashita; Kiyoto Sasaki; Masamori Endo
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Paper Abstract

In this paper, we demonstrate an extremely low-concentrated solar-pumped laser (SPL) that uses a transversely excited fiber laser geometry. To eliminate the need for precise solar tracking with an aggressive cooling system and to considerably increase the number of laser applications, low-concentration factors in SPLs are highly desired. We investigate the intrinsic low-loss property of SiO2 optical fibers; this property can be used to compensate for the extremely low gain coefficient of the weakly-pumped active medium by sunlight. As part of the experimental setup, a 40-m long Nd3+-doped SiO2 fiber coil was packed in a ring-shaped chamber filled with a sensitizer solution; this solution functioned as a down-shifter. The dichroic top window of the chamber transmitted a wide range of sunlight and reflected the down-shifted photons, confining them to the highly-reflective chamber until they were absorbed by the Nd3+ ions in the active fiber. We demonstrated a lasing threshold that is 10 times the concentration of natural sunlight and two orders of magnitude smaller than that of conventional SPLs.

Paper Details

Date Published: 26 February 2018
PDF: 8 pages
Proc. SPIE 10512, Fiber Lasers XV: Technology and Systems, 105121J (26 February 2018); doi: 10.1117/12.2288940
Show Author Affiliations
Taizo Masuda, Toyota Motor Corp. (Japan)
Mitsuhiro Iyoda, Tokai Univ. (Japan)
Yuta Yasumatu, Tokai Univ. (Japan)
Tomohiro Yamashita, Tokai Univ. (Japan)
Kiyoto Sasaki, Toyota Motor Corp. (Japan)
Masamori Endo, Tokai Univ. (Japan)


Published in SPIE Proceedings Vol. 10512:
Fiber Lasers XV: Technology and Systems
Ingmar Hartl; Adrian L. Carter, Editor(s)

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