Hempler, N.N.HemplerHopkins, J.-M.J.-M.HopkinsRösener, B.B.RösenerRattunde, MarcelMarcelRattundeWagner, J.J.WagnerFedorov, V.V.V.V.FedorovMoskalev, I.S.I.S.MoskalevMirov, S.B.S.B.MirovBurns, D.D.Burns2022-03-042022-03-042009https://publica.fraunhofer.de/handle/publica/21948610.1364/OE.17.018136A new flexible pump source, the optically-pumped semiconductor disk laser (SDL), for the Cr2+:ZnSe laser is reported. The SDL provides up to 6W output power at a free running central wavelength of 1.98 mu m. The Cr2+: ZnSe laser operated at an output power of 1.8W and a slope efficiency of similar to 50% with respect to absorbed pump power whilst maintaining a low output intensity noise figure of <0.14% RMS. The system required no optical isolation even under the situation of significant optical feedback.en667621journal article