Efficient continuous-wave (cw) lasing of Cr<sup>2+</sup>:ZnS and Cr<sup>2+</sup>:ZnSe crystals in external hemispherical cavities and in a microchip configuration under Er-fiber-laser pumping at room temperature are reported. The key result is what is believed to be the first successful demonstration of cw Cr<sup>2+</sup>:ZnS and Cr<sup>2+</sup>:ZnSe microchip lasers with maximum output powers of 63 and 100 mW at 2320 and 2520 nm, with slope efficiencies of 53% and 20%, respectively.
© 2002 Optical Society of America
(140.3070) Lasers and laser optics : Infrared and far-infrared lasers
(140.3500) Lasers and laser optics : Lasers, erbium
(140.5680) Lasers and laser optics : Rare earth and transition metal solid-state lasers
S. B. Mirov, V. V. Fedorov, K. Graham, I. S. Moskalev, V. V. Badikov, and V. Panyutin, "Erbium fiber laser–pumped continuous-wave microchip Cr2+:ZnS and Cr2+:ZnSe lasers," Opt. Lett. 27, 909-911 (2002)