Articles written in Pramana – Journal of Physics
Volume 41 Issue 3 September 1993 pp 209-217 Research Articles
The efficiency of acoustooptic (AO) interaction in YZ-cut proton exchanged (PE) LiNbO3 waveguides is theoretically analysed by determining the overlap between the optical and acoustic field distributions. The present analysis takes into account the perturbed SAW field distribution due to the presence of the PE layer on the LiNbO3 substrate determined by the rigorous layered medium approach. The overlap is found to be significant upto very high acoustic frequencies of the order of 5 GHz, whereas in the earlier analysis by vonHelmolt and Schaffer  for diffused waveguides, it was shown that the overlap integral rolls down to nearly zero at this high frequency range.
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