Abstract
Geometrical effects on the optical damage in proton exchanged LiNbO 3 waveguides are analyzed. Light intensity thresholds and beam profiles at different intensities have been measured for guides prepared on z- and x-cuts. z-cut α-phase proton exchanged guides show a threshold intensity of the same order of magnitude but slightly greater than x-cut. The more important differences between both guides cuts are a clear asymmetry of beam-profile in x-cut guides as opposite to z-cut and the existence of a chaotic evolution at high intensities only found in x-cut guides. The influence of the proton-exchange time on optical damage threshold has been also investigated in z-cut waveguides to compare them with recent reported data on x-cut guides.
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