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Study on Optical Properties and Two-Waving Experiments of Potassium Sodium Tantalate Niobate Crystal

Author: LvZuoZuo
Tutor: ZhouZhongXiang
School: Harbin Institute of Technology
Course: Optics
Keywords: potassium sodium tantalate niobate quadratic electro-optic effcet two-wave coupling
CLC: O734
Type: Master's thesis
Year: 2008
Downloads: 20
Quote: 0
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Abstract


Recently, the speedup of the information transmission has become the key of the society development. With the rapid development of communications, all-optical network is getting closer and closer to us. The optical transmission net also becoming more and more speedup and bulky, which putting forward more demands to the performance of the optical communication devices. Application of the device is always demanded for people to promote the new material exploration. Potassium lithium tantalate niobate (K1-yLiyTa1-xNbxO3, KLTN) has been considered as the best material for electroholographic applications. It exhibits enhanced phoyorefractive properties under external electric field, for combining the advantages of high diffraction efficiency, fast electro-optic respons time (about several ns) and very large Kerr coefficients. Basing on lithium, sodium belonged to alkali metals, we will be the element lithium replaced sodium elements in KLTN single crystal, this text has carried on preliminary research to K1-yNayTa1-xNbx (KNTN) single crystal.Firstly, the physical properties of KNTN crystal were investigated in detail. The structures of KNTN crystal was studied using X-ray powder diffraction method. The dielectric coefficient of KNTN was studied, which changes with various temperatures beying the Curie-Weiss law. The Curie temperature of it was determined according to this law. The refractive indices of KNTN crystal were measured accurately by the minimum deviation method. The Sellmeier’s equation of refractive indices for KNTN was obtained in terms of least-squares fit. The optical transmission properties was investigated by a UV-Visible-NIR spectrometer, the transmission spectrum was determinied. Energy band gap of the crystal was calculated according to the crystal’s ultraviolet absorbing edge.Secondly, introduced the electro-optic effect using index ellipsoid systematically. Analyzed the refractive index changes under different external fields combined the structure of KNTN crystal. An auto scan Mach-Zehnder interferometer has been designed and built for measuring the quadractic electro-optic (QEO) properties of paraelectric KNTN crystal, which versus the temperature factor. KNTN crystal has large QEO coefficient h11 which is a orders higher than other electro-optic materials. The reasons of the measurement results had been explained using Curie-Weiss Law.In the end, investigated the photorefractive properties of KNTN crystal using the two-wave mixing technique, derived the expression of two-wave coupling gain coefficient and diffraction efficiency. The dominant charge carrier was identified from the direction of two-wave coupling energy transfer. The diffraction efficiency and the gain coefficient were measured as a function of crossing angle of incident lights and different external fields at the wavelength of 532nm, whose maximum value were determined. The change of effitive index of refraction was studied by fitting a theoretical equation.

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CLC: > Mathematical sciences and chemical > Crystallography > Crystal physics > The optical properties of the crystal
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