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1 OPTIMA - Optique et Matériaux NEEL - Institut Néel 2 CrisMass - Cristaux Massifs NEEL - Institut Néel 3 Laser Physics-KTH KTH - Royal Institute of Technology Stockholm, Sweden 4 KTH - Royal Institute of Technology Stockholm, Sweden 5 X-Press - X-Press NEEL - Institut Néel 6 POM - Optique et microscopies NEEL - Institut Néel

Abstract : Periodically-poled ferroelectric crystals show unprecedented efficiency and properties otherwise impossible to obtain. Unfortunately, the sample thickness obtainable today limits their use to low and moderate power application. With the aim of increasing the size of periodically domain-structured crystals with a controlled and regular grating period, we proposed an epitaxial growth process using seeds made of thin plates domain engineered by electric field poling. We demonstrated this process with the ferroelectric crystal KTiOPO4 KTP which is one of the most promising candidate materials for that purpose. The poling step requires a sample exhibiting 001 and 00 1 over bar faces, so that the growth step has to be performed onto these faces. This constraint is a difficulty to circumvent as these faces are not present in the standard equilibrium morphology. It is then necessary to find the growth conditions enabling to work below the roughening temperature of these faces. By using a high temperature solution method, the so-called -flux method-, and by choosing an appropriate chemical composition of the flux solution, we obtained periodically domain-structured KTP layers with thicknesses up to 800 mu m and regular periodicity onto 001 and 00 1 over bar faces of the initial PPKTP seeds.

Keywords : Growth from high temperature solutions Liquid phase epitaxy Ferroelectric materials Nonlinear optic materials





Autor: Alexandra Pena - Bertrand Menaert - Benoit Boulanger - Fredrik Laurell - Carlota Canalias - Valdas Pasiskevicius - Luc Ortega - P

Fuente: https://hal.archives-ouvertes.fr/



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