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Efficient coupling into tapered proton-exchanged LiNbO3 waveguides fabricated by vertically controlled immersion

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Abstract

Planar LiNbO3 waveguides with a 5-mm tapered region and a 10-mm homogeneous slab waveguide region were fabricated by a double proton-exchange process. The 4-μm waveguide entrance gives rise to a coupling efficiency as high as 93%; the precise control of the depth profile of the tapered region results in a low 1-dB power transfer loss from the tapered region to the 0.4-μm-depth working region. The techniques developed provide an alternative to prism coupling into planar waveguides in Čerenkov second-harmonic generation applications.

© 1996 Optical Society of America

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