Abstract
This paper reports an efficient method of using a chirped grating to reduce the phase-matching sensitivity and increase the output power of continuous wave second harmonic generation in a MgO doped LiNbO3 waveguide. It was found that using a chirped grating with decreasing periods from 6.96 μm to 6.95 μm significantly improved the phase mismatch tolerance and increased the second harmonic generation output power from 0.64 W (using uniform grating) to 1.13 W. This design was shown to lead to a phase matching insensitive waveguide. This indicates that there is a possibility of obtaining higher output power with the MgO doped LiNbO3 waveguide.
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