Abstract
A -doped mid-IR laser crystal was successfully grown using the vertical Bridgman method. An intense 2.8 μm emission in crystal was observed for the first time. By analyzing the absorption and emission measurements of the crystal with the Judd–Ofelt theory, the intensity parameters , exited state lifetimes, branching ratios, and emission cross-sections were calculated. It is found that the crystal has high fluorescence branching ratio (20.99%), large emission cross section (), long fluorescence lifetime (5.4 ms), and high quantum efficiency (88.4%) corresponding to the stimulated emission of : transition. The structure of crystal was also analyzed by the Raman spectrum, and it was found that the crystal possesses low phonon energy of . We propose that the crystal may be a promising material for 2.8 μm laser applications.
© 2014 Optical Society of America
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