Acousto-optic TE0-TM0 mode conversion in a thin film of amorphous tellurium dioxide

TE0-TM0 mode conversion by acousto-optic effects has been demonstrated using an amorphous-tellurium-dioxide optical waveguide and ¿ quartz substrate. An acoustic surface wave with a frequency of 160 MHz was used to induce photoelastic coupling in the waveguide. The incident angle of the optical beam with respect to the acoustic wavefront for obtaining TE0-TM0 crosscoupling agrees well with the value predicte from abnormal Bragg diffraction.