Abstract
We report efficient cw laser operation of laser diode pumped -doped crystals in the visible spectral region. Using two InGaN laser diodes emitting at with maximum output power of each and a -long crystal with a doping concentration of 0.5%, output powers of , , , and were achieved for the laser wavelengths , , , and , respectively. The maximum absorbed pump powers were approximately , resulting in slope efficiencies of 63.6%, 32.0%, 52.1%, and 61.5%, as well as electro-optical efficiencies of 9.4%, 4.2%, 3.8%, and 7.7%, respectively. Within these experiments, laser diode-pumped laser action at was demonstrated for what is believed to be the first time.
© 2011 Optical Society of America
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