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Intense 2.8 μm emission of Ho3+ doped PbF2 single crystal

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Abstract

A Ho3+-doped PbF2 mid-IR laser crystal was successfully grown using the vertical Bridgman method. An intense 2.8 μm emission in Ho:PbF2 crystal was observed for the first time. By analyzing the absorption and emission measurements of the Ho:PbF2 crystal with the Judd–Ofelt theory, the intensity parameters Ω2,4,6, exited state lifetimes, branching ratios, and emission cross-sections were calculated. It is found that the Ho:PbF2 crystal has high fluorescence branching ratio (20.99%), large emission cross section (1.44×1020cm2), long fluorescence lifetime (5.4 ms), and high quantum efficiency (88.4%) corresponding to the stimulated emission of Ho3+: I65I75 transition. The structure of Ho:PbF2 crystal was also analyzed by the Raman spectrum, and it was found that the Ho:PbF2 crystal possesses low phonon energy of 257cm1. We propose that the Ho:PbF2 crystal may be a promising material for 2.8 μm laser applications.

© 2014 Optical Society of America

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