Abstract
We directly measured the phase-matching angles of second-harmonic generation and difference-frequency generation up to 6.5 µm 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.
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