Abstract
We report efficient generation of 671 nm red light based on
quasi-phase-matched second harmonic generation of 1342 nm in
LiNbO3 waveguides. The design method and fabrication process of
the high-quality annealed proton-exchanged periodically poled channel
waveguides were presented. A continuous-wave 1.71 mW red light was
obtained with a single-pass conversion efficiency of
47%·W−1·cm−2, which is 88% that of the theoretical
value. While for 1 mW quasi-continuous-laser input, the corresponding peak
power being 2 W, the conversion efficiency reached up to 60%. Our results
indicate that the annealed proton-exchanged periodically poled
LiNbO3 waveguide is promising for high-efficiency and low power
consumption nonlinear generation of visible light.
© 2020 Chinese Laser Press
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