Ytterbium-doped Sr<sub>5</sub>(PO<sub>4</sub>)<sub>3</sub>F was successfully lased at 985 nm in quasi-cw mode with a slope efficiency of 74% and an absorbed threshold energy of 18 mJ. <i>Q</i>-switched slope efficiencies of 21% were obtained with a maximum energy of 9.4 mJ in 8.8-ns pulses.
(140.3380) Lasers and laser optics : Laser materials
(140.3410) Lasers and laser optics : Laser resonators
(140.3540) Lasers and laser optics : Lasers, Q-switched
(140.5680) Lasers and laser optics : Rare earth and transition metal solid-state lasers
A. J. Bayramian, C. Bibeau, R. J. Beach, C. D. Marshall, S. A. Payne, and W. F. Krupke, "Three-level Q-switched laser operation of ytterbium-doped Sr5(PO4)3F at 985 nm," Opt. Lett. 25, 622-624 (2000)