TEm-TMn mode conversion by electro-optic and acousto-optic effects in a metal-diffused optical waveguide is described theoretically. Elastic surface waves and laser beams propagate along the X axis on Y-cut LiNbO3 single crystals, i.e., interactions are collinear. We predict completely the TE1-TM1 mode conversion at an elastic surface wave power of 33 mW along an interaction length of 5 mm with a width of 1 mm.
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