Abstract
Oscillation at wavelength has been investigated in the low-phonon, moisture-resistant crystal in free-running mode at room temperature. In line with our knowledge this is the longest laser wavelength for a rare-earth doped crystal that does not require any special precautions for survival. Spectra and kinetics of luminescence of the new laser crystal were investigated under pumping to absorption band, corresponding to lasing experiments. Emission cross sections were determined for mid-IR transitions. It was found that emission cross section on the laser transition at wavelength is as high as .
© 2007 Optical Society of America
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