Abstract
The spectra of and crystals were measured under the same conditions. With the presence of ions, the intensities of the green, red upconversion and near-infrared emissions are dramatically reduced to , , and of those for . Furthermore, the lifetimes of upper and lower laser levels fall from 450 and 982 μs to 84.8 and 74.3 μs. It is obvious that the self-saturation for 2.7 μm laser is effectively suppressed. The energy transfer efficiencies and coefficients of are also calculated. These results indicate that codoping is beneficial in achieving 2.7 μm laser in crystal.
© 2012 Optical Society of America
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