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Etude des non-linéarité photoréfractives dans les composés semi-isolants III-V et II-VI : influence d'une irradiation électronique

Philippe Delaye 1
1 Laboratoire Charles Fabry de l'Institut d'Optique / Manolia
LCFIO - Laboratoire Charles Fabry de l'Institut d'Optique
Abstract : This manuscript presents the study of the photorefractive effect in the near infrared and, particularly, the study of materials senitive in this wavelength range. The first part of our work consist in studying esisting mareials synthetized for microelectronic applications: GaAs and InP. Experimental and theoretical study permit us to understand their properties and to point out their limitations, notably for applications around 1,3 micro meter. Considering these results, we propose an optimization technique of GaAs performances that uses electron irradiation. Irradiation induces small variationof the Fermi level povision, that should favor photorefractive effect at 1,3 micromerter. results we obtain, show that the expected effect is strongly counterbalanced by the creation of an irradiation defect located at mid gap. The direct influence of this defect has been established by the development pf a theoretical model of photorefractive effect taking into account two deep levels. In parallel th this study of the effect of irradiation, we work on II-VI compounds, like the CdTe. The first crystals we studied, present a noticeable photorefractive gain with low power beams. These results confirm the promises of these crystals for an extension of photorefractive effect toward 1,5 micrometer. At the end, we present a technique to that enhanced amplify photorefractive gain. It uses square AC field. An augmentation of the gain of one order of magnitude is obtained.
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https://pastel.archives-ouvertes.fr/pastel-00608575
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Submitted on : Wednesday, July 13, 2011 - 2:28:41 PM
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  • HAL Id : pastel-00608575, version 1

Citation

Philippe Delaye. Etude des non-linéarité photoréfractives dans les composés semi-isolants III-V et II-VI : influence d'une irradiation électronique. Optique [physics.optics]. Université Paris Sud - Paris XI, 1993. Français. ⟨NNT : 1993PA112138⟩. ⟨pastel-00608575⟩

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