Phase-matching properties and refined Sellmeier equations of La3Ga5.5Nb0.5O14

We directly measured the phase-matching angles of second-harmonic generation and difference-frequency generation up to 6.5 mu m in the Langanate crystal La3Ga5.5Nb0.5O14 (LGN). We also determined the nonlinear coefficient and damage threshold. We refined the Sellmeier equations of the ordinary and extraordinary principal refractive indices, and calculated the conditions of supercontinuum generation. (C) 2018 Optical Society of America under the terms of the OSA Open Access Publishing Agreement