We report the demonstration of high-power (840 mW) continuous-wave laser oscillation from Fe2+ ions in zinc selenide. The output spectrum of the Fe:ZnSe laser had a line-center near 4140 nm with a linewidth of 80 nm. The beam quality was measured to be M2≤1.2 with a maximum slope efficiency of 47%. Small shifts observed in output wavelength with increased output power were attributed to thermal effects. No thermal roll-off of slope efficiency was observed at the maximum of output power.
© 2012 Optical Society of America
Lasers and Laser Optics
Original Manuscript: September 17, 2012
Revised Manuscript: October 22, 2012
Manuscript Accepted: October 22, 2012
Published: November 30, 2012
Jonathan W. Evans, Patrick A. Berry, and Kenneth L. Schepler, "840 mW continuous-wave Fe:ZnSe laser operating at 4140 nm," Opt. Lett. 37, 5021-5023 (2012)