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State of the art of the sphere method, a unique characterization technique for non-linear crystals

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We report the sphere method as a unique characterization technique for the complete study of non-linear optical properties for frequency conversion in new materials belonging to the uniaxial or biaxial optical class. It relies on the use of a single crystal with millimetre dimensions cut as a sphere, combined with a tuneable laser source. With the sphere method we perform direct measurements of phase-matching angles and associated conversion efficiencies for second harmonic, sum- and difference-frequency generation. Furthermore, we follow the orientation of the dielectric frame as a function of the wavelength for monoclinic and triclinic crystals. It also allows the determination of the magnitude of the principal refractive indices in biaxial crystals based on the study of the double refraction affect at the exit of a sphere. By combining the analysis of all these data simultaneously, we determine Sellmeier equations reliable over the whole transparency domain and we are able to get the non-zero elements of the second-order susceptibility tensor of uniaxial or biaxial crystals. Finally, the sphere method is completely self-sufficient for the study of biaxial crystals.

Affiliations: 1: Institut Néel, Centre National de la Recherche Scientifique & Université Joseph Fonrier, BP 166, 38402 Grenoble Cedex 9, France; 2: Laboratoire de Cristallographie, Centre National de la Recherche Scientifique, 25 Avenue des Martyrs, BP 166, 38042 Grenoble Cedex 09, France

10.1163/156856708783623519
/content/journals/10.1163/156856708783623519
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/content/journals/10.1163/156856708783623519
2017-08-23

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