Abstract
Iron-doped ZnTe (Fe2+:ZnTe) crystal can be used as promising gain media for mid-infrared laser. However, there are few studies in the optical properties of Fe2+:ZnTe crystal from mid-infrared to ultraviolet. In this work, large size Fe2+:ZnTe bulk crystal (the concentration of Fe ions is about 1019 cm−3) with a dimension of Φ30 mm × 50 mm was grown by the temperature gradient solution growth (TGSG) method. The luminescence and optical properties of Fe2+:ZnTe from terahertz wave to ultraviolet wave have been studied. The evaluated refractive index of Fe2+:ZnTe crystal is approximately 2.5–3.0 at the frequency range of 0.5–2.0 THz range. And its band gap is estimated to be about 2.24 eV. It is noted that strong absorptions at the wavelength of 2.8–4.7 μm and 705 nm were observed. Based on the experimental results, the energetic positions of Fe2+ center such as 3T1, 5T2, 5E in ZnTe crystal were proposed.
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