Abstract
Abstract Gain experiments based on the interconfigurational 4f5d to 4f 2 optical transitions in praseodymium-doped fluoride crystals were achieved. The measurements were performed under upconversion pumping of the 4f5d excited configuration via the 3 P J , 1 I 6 intermediate levels of the 4f 2 configuration, using a pump-probe set-up with three synchronized Q-switched nanosecond pulsed lasers. In spite of this two-step excitation, optical losses, due excited state absorption (4f5d→conduction band transition) leading to Pr 3+ ion photoionisation and color center formation, were too high to observe any amplification. However, these losses were found definitely weaker in fluoride crystals (Pr:LiYF 4 , Pr:LiLuF 4 ) than in oxides (Pr:YAlO 3 ) and, probing the 5d→4f emission of Ce 3+ under two-step excitation pumping of the Pr 3+ 4f5d states in co-doped Pr,Ce:LiLuF 4 crystals, no losses were detected at all.
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