Abstract
A Ho3+-doped silica glass, 0.08Ho2O3–1.6Al2O3–98.32SiO2 (mol%), was prepared by the sol–gel method combined with high temperature sintering. The 2μm luminescence properties of the Al3+/Ho3+ co-doped silica core glass were investigated. A single-mode double cladding Al3+/Ho3+ co-doped silica fiber with a 15μm core diameter and 0.08 core numerical apertures was prepared. Pumped with a 1.95μm Tm3+ fiber laser, 320mw laser output centered at 2040nm with M2 factor of 1.14 was obtained from a 150-cm-long double-cladding fiber. The laser has a threshold of 850mw launched power with a slope efficiency of 48.46%. For the first time a robust single-mode 2μm fiber laser was realized in a fiber with Al3+/Ho3+ co-doped silica core glass prepared by the sol–gel method.
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