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Proceedings Paper

Excitation wavelength dependence of quantum efficiencies of Nd-doped glasses for solar pumped fiber lasers
Author(s): Takenobu Suzuki; Hiroyuki Kawai; Hiroyuki Nasu; Mark Hughes; Shintaro Mizuno; Kazuo Hasegawa; Hiroshi Ito; Yasutake Ohishi
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Paper Abstract

The quantum efficiencies of the emission from the 4F3/2(R) level of Nd doped in tellurite glass were measured with an integrating sphere using natural sunlight(ηns), simulated sunlight (ηns), and 808 nm laser light (η808), respectively. The radiative quantum efficiency (ηr) was estimated from the fluorescence lifetime (τf) and the radiative lifetime calculated by Judd-Ofelt analysis (τr). ηr was almost 100 % for χ ≤ 0.5 mol.%. η808 was 86 % for χ=0.05 mol.% and decreased monotonically with increasing in χ. ηns had a peak at χ=0.5 mol.% and the maximum was 33 %. It is thought absorption of the excitation light by the host glass limits the quantum efficiency of the tellurite glass under sunlight excitation. Therefore, it is important to reduce absorption of the tellurite glass host in order to realize efficient solar-pumped tellurite fiber lasers.

Paper Details

Date Published: 25 February 2010
PDF: 8 pages
Proc. SPIE 7598, Optical Components and Materials VII, 75981L (25 February 2010); doi: 10.1117/12.840492
Show Author Affiliations
Takenobu Suzuki, Toyota Technological Institute (Japan)
Hiroyuki Kawai, Toyota Technological Institute (Japan)
Hiroyuki Nasu, Toyota Technological Institute (Japan)
Mark Hughes, Toyota Technological Institute (Japan)
Shintaro Mizuno, Toyota Central Research and Development Labs., Inc. (Japan)
Kazuo Hasegawa, Toyota Central Research and Development Labs., Inc. (Japan)
Hiroshi Ito, Toyota Central Research and Development Labs., Inc. (Japan)
Yasutake Ohishi, Toyota Technological Institute (Japan)

Published in SPIE Proceedings Vol. 7598:
Optical Components and Materials VII
Shibin Jiang; Michel J. F. Digonnet; John W. Glesener; J. Christopher Dries, Editor(s)

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