Growth and Device Fabrication of Mid to Far-Infrared Cr2+/Fe2+∶CdSe Crystals
In this study,the Cr2+∶CdSe and Fe2+∶CdSe crystals were successfully grown by the Mo-crucible sealed Bridgman method using a vacuum single-crystal furnace with two zones developed by ourselves,and the crystal size reaches ø51 mm × 110 mm.Cr2+∶CdSe and Fe2+∶CdSe crystals demonstrate obvious absorption in the bands of 1 400～2 400 nm and 2 500～5 200 nm,respectively.The transmittances of Cr2+/Fe2+doped CdSe crystals are close to the transmittance limit of CdSe crystal(～70％)in the 7～15 μm band,and the converted absorption coefficient is about 0.005 cm-1.The Cr2+/Fe2+∶CdSe crystals grown by the Mo-crucible sealed Bridgman method have the advantages of the controllable doping concentration of transition metal ions,uniform doping and high crystal quality.The Cr2+/Fe2+∶CdSe crystals could be used as both mid-infrared laser crystal and far-infrared nonlinear optical crystal material.
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