Cross Sections, Transition Intensities, and Laser Generation at the ³ P <inf>1</inf> → ³ H <inf>5</inf> Transition of LiY <inf>0.3</inf> Lu <inf>0.7</inf> F <inf>4</inf> :Pr ³⁺ Crystal

© 2019, Springer Science+Business Media, LLC, part of Springer Nature. Lasing and spectroscopic properties of an LiY 0.3 Lu 0.7 F 4 :Pr 3+ crystal grown by the Bridgman–Stockbarger method were investigated in detail. Absorption and luminescence spectra were recorded using polarized light. Lifetimes of excited states 3 P J were determined. Absorption and emission transition intensities were calculated according to f–f-transition intensity theory taking into account interconfiguration interaction. Stimulated emission transverse cross sections were determined using the Füchtbauer–Ladenburg method. Pumping by an InGaN laser diode produced continuous-wave laser generation at 522.6 nm ( 3 P 1 → 3 H 5 ) in Pr-doped mixed fluoride crystals with a maximum output power of 0.38 W and a slope efficiency of 19%