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Characterization of proton‐exchange slab optical waveguides in z‐cut LiNbO3

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5 Author(s)
Clark, D.F. ; Department of Electronics and Electrical Engineering, University of Glasgow, Glasgow G12 8QQ, Scotland, United Kingdom ; Nutt, A.C.G. ; Wong, K.K. ; Laybourn, P.J.R.
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We report the results of a systematic study on planar optical waveguides fabricated in z‐cut LiNbO3 by proton exchange in benzoic acid. It was found that the refractive index varied with depth and could be accurately modeled by a step index profile with Δn=0.126. Diffusion coefficients have been calculated from mode effective refractive index measurements, assuming a step index profile, and hence a value for the activation energy for the proton exchange process has been deduced. The lowest measured optical propagation loss in single‐mode waveguide at a 633‐nm wavelength was 2.4 dB/cm.

Published in:

Journal of Applied Physics  (Volume:54 ,  Issue: 11 )

Date of Publication:

Nov 1983

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