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Scattering defects, which severely affect the optical quality of materials, have been investigated in polycrystalline ZnSe and ZnS grown by chemical vapor deposition (CVD). Cr ions were introduced into the grown hosts (Cr 2+ :ZnS/ZnSe) as mid-infrared laser gain media by the post-growth diffusion method. Decrease of the as-grown defects was observed after the diffusion process giving rise...
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