NÉEL INSTITUTE Grenoble - Institut NÉEL
Transcription
NÉEL INSTITUTE Grenoble - Institut NÉEL
NÉEL INSTITUTE Grenoble Topic for Master 2 internship – Academic year 2016-2017 Growth conditions to stabilize polar faces of ferroelectric crystals General Scope: Periodically poling of KTiOPO4 (KTP) crystals by electric field poling is the way to improve the conversion efficiency by the quasi-phase matching technique [H. Karlsson and F. Laurell, Applied Physics Letters 71, 3474 (1997)]. Electric field poling technique leads to periodically poled crystals of limited thickness that is detrimental to obtain high power application. A way to getting around this limitation consist in the growth, from high temperature solutions, onto polar faces of periodically poled KTiOPO4 (PPKTP) thin slabs obtained by electric field poling [A. Peña, et al., Optical Materials Express 1, 185 (2011) and Journal of Crystal Growth 360, 52 (2012)]. Nevertheless, this growth process have to take into account kinetic and thermodynamic considerations in order to propagate the grating periodicity of the initial seed to the as grown layer. Research topic and facilities available: The research project will be focused in doing several growth experiments onto single domain KTP slabs in order to determine the stability of {001} polar faces. The first objective of the project is to find the experimental conditions to be able to stabilize both non-equivalent polar faces, (001) and (00-1). The second one is growing these faces at the same growth rate to be able to grow thick PPKTP crystals to be used in high power optical devices. The growth devices are available in the technical services (pôle Cristaux Massifs of MCBT department) and the SEM and AFM in the technical services (pôle Optique et microscopies of PLUM department) of Institut Néel. Possible collaboration and networking: The master 2 stage is going to be under the supervison of Alexandra Peña Revellez(CR1, OPTIMA research team) and in close interaction with Bertrand Ménaert (IRHC, pôle Cristaux Massifs), and Benoît Boulanger (PRCE1, OPTIMA research team). Collaborations, Jérôme Debray (IE2, pôle Cristaux Massif) will also be important. Possible extension as a PhD: The internship could move on a PhD if financial support is found. Required skills: Materials science Skills in crystal growth will be appreciate Starting date: March 2017 Contact: Name: Alexandra Peña Revellez Institut Néel - CNRS Phone: (33) 4 76 88 79 41 e-mail: [email protected] (33) 4 76 88 78 03 [email protected] More information: http://neel.cnrs.fr