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