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Abstract
A new model of incoherent-to-coherent IR image converter based on a GaAs photo- conductor joined to an electro-optic (EO) Bi12SiO20 crystal has been analysed theoretically and experimentally. The possibility of field transfer from the photoconductor to the EO crystal under infrared (IR) radiation sufficient for realization of the EO (Pockels) effect in the EO crystal was assessed. Based on the electric field parameters and the parameters of the photo- conductor and EO crystal, the threshold sensitivity of the converter was estimated. The experimental photoconductor-EO crystal structure by which IR radiation (0.9–1.5 μm) was converted into coherent visible radiation was obtained on the basis of theoretical calculations. The measured threshold sensitivity of the converter, 5 x 10−4 W/cm2, was found to be in the limits of theoretical estimation. The good recognition results suggest that the advantages of this device, such as good grey-level reconstruction, make it an effective coherent infrared image converter.