We report on a red Praseodymium fiber laser delivering 1.07 W at 634.5 nm with a slope efficiency of 20.7% (vs. the incident pump), a laser threshold of 0.55 W and a single-mode output (M 2 x,y <1.1) in the quasi-continuouswave regime. It is based on a 0.6 mol% Pr 3+ -doped ZBLAN double-clad fiber with a 5.5 μm core, a double D-shaped (diameters: 115/125 μm) inner cladding and a length of 5.0 m. The fiber is pumped by a multimode 443-nm GaN diode. The laser design is optimized using a numerical model. The proposed concept is suitable for the development of diode-pumped high brightness watt-level visible Praseodymium fiber lasers.
This paper describes a new method based on the use of a broadband monitoring system to determine the spectral dependence of the optical constants of a layer without using a dispersion model.
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