5 October 2005 Photorefractive properties of doped and irradiated cadmium telluride crystals
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Abstract
In this paper we propose a new method to control the spectroscopic and nonlinear-optical properties of photorefractive semiconductor CdTe crystals using the radiation defects caused by electrons and gamma-quanta irradiation. The photorefractive response is analyzed using the four-wave mixing pattern of laser pulses, one of which is delayed in time. It is found that both the irradiation and doping of cadmium telluride crystals with vanadium, titanium or ferrum leads to changes in the spectroscopic and nonlinear-optical properties of the crystals. Apart from relatively narrow bands appearing in the absorption spectra due to additional energy levels within the band gap, one can observe variations in the absorption factor over a wide spectral region. Recording of dynamic holograms is realized with no external electric field owing to pulsed laser radiation at a wavelength of 1.06 μm and diffraction efficiency of 1 - 2 %.
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I. N. Agishev, A. L. Tolstik, O. K. Khasanov, "Photorefractive properties of doped and irradiated cadmium telluride crystals", Proc. SPIE 5949, Nonlinear Optics Applications, 59491R (5 October 2005); doi: 10.1117/12.622977; https://doi.org/10.1117/12.622977
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