Abstract
A novel Ho3+,Pr3+-codoped LaF3 mid-IR laser crystal was successfully grown and analyzed. Enhanced emission at ~2.86 μm was observed for the first time. The effect of Pr3+ co-doping on the ~2.86 μm photoluminescence of Ho3+ was investigated. Compared with Ho3+ singly-doped LaF3 crystal, the Ho3+,Pr3+-codoped LaF3 crystal possessed stronger emission intensities at ~2.86 μm. It was also found that the energy transfer efficiency of Ho3+: 5I7 → Pr3+: 3F2 (71%) is much greater than that of Ho3+: 5I6 → Pr3+: 3F4 (28%), which almost restrained the self-termination problem in this Ho3+:Pr3+:LaF3 crystal. All the results indicated that Ho:Pr:LaF3 crystal is an attractive laser medium for ~2.86 μm laser applications.
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