Abstract
We report highly efficient laser operation of praseodymium-doped in the green spectral range. The influence of the crystal length and pump light focusing on the laser performance has been studied. The pump radiation was delivered by InGaN laser diodes. Optimizing the setup for a long crys tal with a doping concentration of 0.5% led to an electric to green laser power conversion efficiency as high as 7.4%. With 500 and of pump light power, output powers of 179 and have been reached, respectively. With respect to absorbed power, slope efficiencies of up to have been achieved.
© 2010 Optical Society of America
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