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Réalisation de guides d'ondes pour l'optique non-linéaire. Développement de nanocomposites inorganiques

Abstract : A great effort of research relates to the developpment of new solutions for second harmonic generation in waveguides, generally produced by ion exchange or implantation on optically non-linear single-crystal substrates.
In the first part of this work, we used the proton exchange technique to produce waveguides on lithium iodate substrates, a material largely used for application in non-linear optics. Waveguides presenting an attenuation lower than 1 dB/cm were obtained and we showed, by a combined X-ray diffraction, Raman spectroscopy and m-lines spectroscopy study, that the guiding layer consisted in solid solution Li(1−x)HxIO3 whose refraction
index is proportional to the proton concentration (x). We also characterised the exchange process kinetics. However, the high values of diffusion coeffcients at ambient temperature do not allow to obtain stable waveguides under standard conditions of use.
Keeping the aim of achieving waveguides for non-linear optics, we gave up the use of singlecrystal lithium iodate to insert it in the form of nanocrystals in amorphous matrices.
Thus, two types of nanocomposites were studied, one constituted of a silica matrix elaborated by sol-gel technique, the other made of Laponite, a very low cost synthetic clay. For each composite, a structural study has allowed to determine the kinetics of crystallisation of LiIO3 and nanocrystals have been oriented by the application of an external electric field during nucleation.
Finally, for LiIO3/Laponite composite, waveguides have been carried out and an attenuation of about 2 dB/cm has been measured. We have measured an effective non-linear coeffcient of about 1.6 pm/V for a composite doped with 50% vol. of LiIO3 and a model
has been proposed to describe the non-linear optical behaviour of this composite material.
Then, this model has been used to simulate the performances of periodically oriented structures.
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Contributor : Jeremie Teyssier <>
Submitted on : Monday, December 6, 2004 - 4:25:18 PM
Last modification on : Friday, November 6, 2020 - 3:26:57 AM
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Jeremie Teyssier. Réalisation de guides d'ondes pour l'optique non-linéaire. Développement de nanocomposites inorganiques. Physique Atomique [physics.atom-ph]. Université de Savoie, 2004. Français. ⟨tel-00007650⟩

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