Excitation wavelength dependence of quantum efficiencies of Nd-doped glasses for solar pumped fiber lasers

Takenobu Suzuki; Hiroyuki Kawai; Hiroyuki Nasu; Mark Hughes; Shintaro Mizuno; Kazuo Hasegawa; Hiroshi Ito; Yasutake Ohishi

doi:10.1117/12.840492

25 February 2010 Excitation wavelength dependence of quantum efficiencies of Nd-doped glasses for solar pumped fiber lasers

Takenobu Suzuki, Hiroyuki Kawai, Hiroyuki Nasu, Mark Hughes, Shintaro Mizuno, Kazuo Hasegawa, Hiroshi Ito, Yasutake Ohishi

Author Affiliations +

Proceedings Volume 7598, Optical Components and Materials VII; 75981L (2010) https://doi.org/10.1117/12.840492
Event: SPIE OPTO, 2010, San Francisco, California, United States

Abstract

The quantum efficiencies of the emission from the ⁴F_3/2(R) level of Nd doped in tellurite glass were measured with an integrating sphere using natural sunlight(η_ns), simulated sunlight (η_ns), and 808 nm laser light (η₈₀₈), respectively. The radiative quantum efficiency (η_r) was estimated from the fluorescence lifetime (τ_f) and the radiative lifetime calculated by Judd-Ofelt analysis (τ_r). η_r was almost 100 % for χ ≤ 0.5 mol.%. η₈₀₈ was 86 % for χ=0.05 mol.% and decreased monotonically with increasing in χ. η_ns 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.

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Takenobu Suzuki, Hiroyuki Kawai, Hiroyuki Nasu, Mark Hughes, Shintaro Mizuno, Kazuo Hasegawa, Hiroshi Ito, and Yasutake Ohishi "Excitation wavelength dependence of quantum efficiencies of Nd-doped glasses for solar pumped fiber lasers", Proc. SPIE 7598, Optical Components and Materials VII, 75981L (25 February 2010); https://doi.org/10.1117/12.840492

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