Abstract

The effect of co-doping Y³⁺ and the doping concentration of Nd³⁺ on the spectroscopic properties and laser performance of Nd:CaF₂ crystals are investigated systematically. For a 0.5% Nd:CaF₂ crystal, the emission lifetime at 1.06 μm increases from 18 to 361 μs by co-doping 10 at.% Y³⁺, while the emission cross section increases to 4.27×10⁻²⁰ cm² at 1054 nm. With a 10 at.% doping concentration of Y³⁺, Nd,Y:CaF₂ crystals concentrate emission bands that peak at 1054 nm with shoulders at 1063 nm, and FWHM at about 30 nm. A diode-pumped, highly efficient laser operation is obtained with 0.5% Nd, 10% Y:CaF₂ and 0.6% Nd, 10% Y:CaF₂ crystals, with slope efficiencies over 30% and 27%, respectively, and a maximum output power up to 901 mW.

© 2015 Chinese Laser Press

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