Abstract
The production of competitive fibre amplifiers in the 1.3 μm region requires both good quantum efficiency in the lasing ion and the capability to produce low-loss fibers. Alkali metal halide substituted gallium lanthanum sulphide (GLS) doped with Pr 3+ may provide a route to both. We describe measurements of the optical spectroscopy and radiative quantum efficiency (RQE) of Pr 3+ emission at 1.3 μm from the 1G 4– 3H 5 transition in GLS glass containing CsCl, CsI, and RbCl. The results indicate that CsCl-containing GLS glasses, which have better thermal and glass-forming properties than pure GLS, can show quantum efficiencies of up to ∼80% of that of pure GLS, and thus are good candidates for 1.3 μm fiber amplifiers.
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