Optimisation of a collinear acoustooptic TEm-TEn mode convertor LiNbO3

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Optimisation of a collinear acoustooptic TEm-TEn mode convertor LiNbO3

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© The Institution of Electrical Engineers
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An analysis is given of the optimisation of the mode conversion of guided optical waves resulting from interaction with collinearly travelling surface acoustic waves of Rayleigh type. The effects of electrooptic and acoustooptic index fluctuations together with the phase matching condition and interaction lenghts are considered. Design criteria and numerical results are given. A number of acoustooptic mode converters are then demonstrated experimentally. A 50% conversion efficiency is obtained for TE1–TM1 conversion in LiNbO3 with acoustic input power of 10 mW. Angular dispersion of laser light has been found to reduce the effective interaction length and this is demonstrated and discussed.

Inspec keywords: optical waveguide components; lithium compounds; integrated optics; acousto-optical devices; surface acoustic wave devices

Other keywords: interaction lengths; collinear acousto optic TEm TEn mode convertor; phase matching condition; guided optical waves; conversion efficiency; acoustic input power; LiNbO3; collinearly travelling surface acoustic waves

Subjects: Integrated optics; Optical waveguides and couplers; Acoustic wave devices; Acousto-optical devices; Optical waveguides; Integrated optics

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