4.6 Article

Quasi-phase matching via femtosecond laser-induced domain inversion in lithium niobate waveguides

Journal

OPTICS LETTERS
Volume 41, Issue 11, Pages 2410-2413

Publisher

OPTICAL SOC AMER
DOI: 10.1364/OL.41.002410

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Funding

  1. Australian Research Council (ARC)
  2. Qatar National Research Fund [NPRP 8-246-1-060]

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We demonstrate an all-optical fabrication method of quasi-phase matching structures in lithium niobate (LiNbO3) waveguides using a tightly focused femtosecond near-infrared laser beam (wavelength of 800 nm). In contrast to other all-optical schemes that utilize a periodic lowering of the nonlinear coefficient. chi((2)) by material modification, here the illumination of femtosecond pulses directly reverses the sign of chi((2)) through the process of ferroelectric domain inversion. The resulting quasi-phase matching structures, therefore, lead to more efficient nonlinear interactions. As an experimental demonstration, we fabricate a structure with the period of 2.74 mu m to frequency double 815 nm light. A maximum conversion efficiency of 17.45% is obtained for a 10 mm long waveguide. (C) 2016 Optical Society of America

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