Mode conversion of acoustooptic interaction in crossed channel waveguide

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In order to study the mechanisms of acoustooptic interactions in a channel waveguide structure, multimode crossed channel waveguides are fabricated on YZ LiNbO3 substrate. Besides, an intedigital transduce centered at 320 MHz is made on the same substrate for AO interaction by its generated surface acoustic wave. Butt coupling is used for the coupling between Helium-Neon Laser and channel waveguide. The mode conversion due to the AO interaction in multimode channel waveguide is found. This mode conversions only occur among harmonic modes but not TE to TM modes. Those phenomena are studied and demonstrated theoretically and experimentally. In conclusion, the mode conversion of AO interaction in channel waveguide structure is caused by the acoustic beam spread. This result can be explained by phase matching condition.

Original languageEnglish
Pages (from-to)136-138
Number of pages3
JournalProceedings of SPIE - The International Society for Optical Engineering
Publication statusPublished - 1984 May 31


All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering

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