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Theses

Photorefractive and electro-optic properties of metal ion doped lithium niobate crystals

Abstract : Lithium niobate (LN) is attractive material for the frequency mixers and doublers, integrated optical devices, electro-optical modulators, holographic data recording and storage thanks to the acousto-optical, non-linear optical, piezo-electrical, electro-optical and photorefractive properties. However, the overall understanding of certain phenomena that is photorefractive effect occurring in the crystal is still under heavy discussion. The mentioned plays a key role: on one side it substantially restricted the main part of the wavelength conversion applications as when illuminated by visible light or near infrared, there are changes semi-permanent in the refractive index of the crystal, causing a distortion of the beam, greatly reducing the efficiency of the device, on the other hand it need to improve for holographic applications. The dissertation is devoted to the investigation of the photorefractive, structural, electro-optical (EO) and dielectrical properties depending on the intrinsic and extrinsic (introduced by incorporation of non photorefractive (〖Zr〗^(4+),〖In〗^(3+)) and photorefractive (〖Fe〗^(2+/3+)) ions) defects in LN crystals resulting to the purposeful control the photorefractive effect taking into account the features of the applications of LN crystals. The aim of the thesis is a development of a vision on advanced photorefractive and electro-optic properties in lithium niobate crystals doped with the transition metal and non-photorefractive ions on the basis of a full investigation of the structural, compositional, electro-optical, photorefractive properties of the mentioned crystals, to work out the parameters of a strong control of the photorefractive properties of this material and optimal conditions for the growth of high quality mentioned crystal with controlled physical properties and to grow this crystals as well.
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Submitted on : Tuesday, April 28, 2020 - 4:37:16 PM
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  • HAL Id : tel-02557319, version 1

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Anush Danielyan. Photorefractive and electro-optic properties of metal ion doped lithium niobate crystals. Optics / Photonic. Université de Lorraine; Armenian state pedagogical university after Khachatur Abovyan, 2019. English. ⟨NNT : 2019LORR0256⟩. ⟨tel-02557319⟩

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