Abstract
Mid-infrared optical gain has been successfully demonstrated by cobalt-doped cadmium telluride using a double-pass amplification technique. A 3.7 µm interband cascade laser was amplified by resonantly pumping Co:CdTe with a 2.8 µm continuous-wave Er-fiber laser. Cobalt-doped-chalcogenide gain media have been of considerable interest because they emit within the 3 – 5 µm atmospheric transmission window, contain broad emission characteristics and have relatively long radiative lifetimes. A measurable gain of 2.8 on the 4A2 ↔ 4T2 transition is reported.
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