J. Phys. IV France 119 (2004) 275-276
DOI: 10.1051/jp4:2004119093

Ca ₄YO(BO ₃)3: Optical frame wavelength dependence, second harmonic generation and dispersion equations

P. Segonds¹, B. Boulanger¹, J.P. Fève², B. Ménaert³, J. Zaccaro³, G. Aka⁴ and D. Pellenc<sup>5

1</sup>  Laboratoire de Spectrométrie Physique,140 Av. de la Physique, 38402 St Martin d'Hères, France
²  JDS Uniphase Commercial Lasers, 31 chemin du Vieux Chêne, 38941 Meylan, France
³  Laboratoire de Cristallographie, 25 Avenue des Martyrs, BP. 166, 38042 Grenoble Cedex 09, France
⁴  Chimie Appliquée de l'État Solide, 11 rue Pierre et Marie Curie, 75231 Paris Cedex 05, France
⁵  LETI-CEA : DOPT/SCMDO CENG, 17 avenue des Martyrs, 38054 Grenoble Cedex, France

Abstract
We report that the optical frame orientation is wavelength independent over the entire transmission range of the nonlinear monoclinic crystal Ca ₄YO(BO ₃) ₃ (YCOB). We used a new method based on internal conical refraction associated with X-rays diffraction using a single crystal cut as a sphere. Direct measurements phase matching angles of second harmonic generation (SHG) were performed in the principal planes of the spherical crystal for fundamental wavelengths up to 3.5 m, while three absorption peaks have been measured above 2.4 m. By fitting all data simultaneously, we found new dispersion equations of the refractive indices of YCOB which are valid in its whole transmission domain.

© EDP Sciences 2004