We report methods of fabrication and laser-spectroscopic characterization of mid-IR gain media based on micron size
Cr2+:ZnSe/ZnS powders, as well as Cr2+:ZnSe/ZnS doped fluorocarbon polymer films, and perfluorocarbon liquids. All
samples demonstrated strong mid-IR luminescence over 2000-3000nm spectral range under optical 1700nm excitation.
The random lasing of the doped liquids and polymer films was realized with pump energy density of 100 and 15mJ/cm2,
respectively. Previously we have demonstrated mid-IR electroluminescence of Cr:ZnSe with n-conductivity provided by
thermal diffusion of Al and Zn. However, the formation of conductivity was accompanied by compensation of the Cr2+
optical centers and relatively weak chromium electroluminescence. In this paper we report study of the Cr2+
compensation in the crystals co-doped with donor and acceptor impurities. Optical and electrical characterization of
Cr:ZnSe crystals with Ag, Cu, Al, In, and Zn co-dopants were studied to optimize mid-IR electroluminescens of the Cr2+
ions. The best results were obtained with p-conductive Ag:Cr:ZnSe samples featuring a low 600 Ωcm resistivity. First
mid-IR electroluminescence in presumable p-type Ag:Cr:ZnSe was demonstrated, which could prove valuable for
developing laser diodes that function in this spectral region.