Efficient Continuous Wave-Laser Emission Of Pr-3+-Doped Fluorides At Room-Temperature

We report, to our knowledge for the first time, Continuous Wave (CW) laser emission at room temperature of Pr:LiYF4 (Pr:YLF) at six wavelengths: 522, 545, 607, 639.5, 720 and 907.4 nm. The pump source was an argon-ion laser tuned to a wavelength of lambda = 457.9 nm. The maximum output powers at 522 nm (P-3(1) -- \u3e H-3(5)) and 639.5 nm (P-3(0) -- \u3e F-3(2)) were 144 and 266 mW, respectively. We also observed CW laser action of Pr:GdLiF4 (Pr:GLF) at lambda = 639 nm and of Pr:KYF4 (Pr:KYF) at lambda = 642.5 nm