Neodymium-doped cladding pumped aluminosilicate fiber laser tunable in the 0.9 micron wavelength range

Abstract

A tunable high-power cladding-pumped neodymium-doped aluminosilicate fiber laser is demonstrated. The maximum power reached was 2.4 W with a slope efficiency of 41% and a threshold pump power of 1.68 W, both with respect to launched pump power, when cladding pumped by two 808 nm diode pump sources at both fiber ends. The dependence of the tuning range on the fiber length is investigated. The tuning range changed from 922 to 942 nm for a 25 m-long fiber to 908-938 nm with a 14 m-long fiber, because of reabsorption effects. The output linewidth was 0.26 nm in a diffraction-limited beam. Operation on the challenging 0.9 µm three-level transition in neodymium-doped double-clad fiber laser was facilitated by a W-type core refractive index profile. This filtered out the unwanted and competing strong transition at 1.06 µm while guidance of 0.9 µm remained intact.

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Identifiers

ORCID for J. Nilsson: orcid.org/0000-0003-1691-7959

ORCID for J.K. Sahu: orcid.org/0000-0003-3560-6152

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