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Messein, France

Bourezzou M.,CNRS Laboratory of Optical Materials, Photonics, and Systems | Maillard A.,CNRS Laboratory of Optical Materials, Photonics, and Systems | Maillard R.,CNRS Laboratory of Optical Materials, Photonics, and Systems | Villeval P.,Cristal Laser | And 4 more authors.
Optical Materials Express | Year: 2011

Large single crystals of a nonlinear optical material LaxYyScz(BO3)4 have been obtained by High Temperature Top-Seeded Solution Growth (HTTSSG). This material is very interesting due to its easy growth procedure, its non hygroscopic properties, a suitable hardness to be reliably cut and polished, a large transparency wavelength range and also good nonlinear properties with potential for UV generation. However, the crystals show inhomogeneities and growth imperfections which can be observed by light scattering and by Schlieren photography method. Chemical etching is used to reveal defects. Observed striations can be related to the growth of rhombohedral facets. © 2011 Optical Society of America. Source


Kokh A.,RAS Institute of Geology and Mineralogy | Kononova N.,RAS Institute of Geology and Mineralogy | Mennerat G.,French Atomic Energy Commission | Villeval Ph.,Cristal Laser | And 4 more authors.
Journal of Crystal Growth | Year: 2010

Using the method of heat field symmetry control [5], large high quality LBO crystals of more than 1.3 kg have been grown. In accordance with the so-called Curie principle, rhombic LBO crystals were grown in the heat field of the same symmetry. Elements of excellent optical homogeneity with diameters up to 50 mm were used for frequency doubling of high energy 1053 nm laser beam. Second-harmonic energies up to 115 J [1] were produced and conversion efficiencies up to 90% were measured. © 2010 Elsevier B.V. All rights reserved. Source


Kokh A.,Russian Academy of Sciences | Vlezko V.,Russian Academy of Sciences | Kokh K.,Russian Academy of Sciences | Kononova N.,Russian Academy of Sciences | And 2 more authors.
Journal of Crystal Growth | Year: 2012

The paper presents LiB 3O 5 crystal growth under oscillating temperature regime provided by sequential switching of the heaters placed around the crucible. First results have demonstrated the ability to grow high-quality crystals under dynamicaly changed (rotating) heat field confirming the possibility to control over heat-mass-transfer processes by proposed contact free method. © 2011 Elsevier B.V. Source


Deyra L.,University Paris - Sud | Balembois F.,University Paris - Sud | Guilbaud A.,University Paris - Sud | Villeval P.,Cristal Laser | Georges P.,University Paris - Sud
Optics Express | Year: 2014

Second-order nonlinear processes such as second harmonic generation or parametric amplification have found numerous applications in the scientific and industrial world, from micromachining to petawatt laser facilities. These nonlinear interactions are mostly carried out in birefringent crystals because of their low cost and the possibility to operate at high powers Phase-matching configurations in birefringent crystals are determined by their refractive indexes. Here, we show that an important mechanical stress can be used to significantly change the phase-matching properties of a birefringent crystal. As an example, we demonstrate the shift of second harmonic non-critical phase matching wavelength of LiB3O5 (LBO) crystal at room temperature from 1200 nm to 1120 nm by applying compressive forces up to 100 MPa. We believe that this mechanical phase matching can be used as an additional degree of freedom to optimize nonlinear optical frequency mixing geometries. ©2014 Optical Society of America. Source


Kokh A.E.,RAS Institute of Geology and Mineralogy | Bekker T.B.,RAS Institute of Geology and Mineralogy | Kokh K.A.,RAS Institute of Geology and Mineralogy | Kononova N.G.,RAS Institute of Geology and Mineralogy | And 4 more authors.
Conference Proceedings - 5th International Conference on Advanced Optoelectronics and Lasers, CAOL' 2010 | Year: 2010

Using the approach of heat filed symmetry change and rotation LBO crystals of more than 1.5 kg of weight were grown from MoO3-containing melt-solution. High quality optical elements up to 65 mm in diameter were produced. At the same time with this approach we obtained high quality BBO crystals about 400 g using NaBaBO3 flux. Elements with apertures up to 30×30 mm2 were produced. The progress in the dimensions of grown crystals provides the opportunity to use them in laser systems of multi petawatt and exawatt power level. © 2010 IEEE. Source

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