Abstract
We have grown high-quality crystals with 0.75, 3.8, 10, 12, 15, 20, and 50 at. % concentrations by the vertical Bridgman method. With low-temperature spectroscopy the Stark sublevel structure of the ground state and the excited state has been determined. With room-temperature spectroscopy, the emission cross section was found to be , being 1.5 times the emission cross section. The luminescence quantum efficiency was measured in samples with different concentrations. Its value was found to be 90% for 3.8 and 10 at. %, 84% for 20 at. %, and 70% for 50 at. % . The laser-emission tunability under diode pumping was found to extend from 1045 up to 1095 nm in a 12 at. % sample with 3.15 mm thickness.
© 2006 Optical Society of America
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