섬유

waveguide type optical isolator using faraday and cotton-mouton effects in bi-substituted yig thin films

  • 출판일1999.03
  • 저자
  • 서지사항
  • 등록일 2016.11.02
  • 조회수 224
the propagation and mode conversion properties of optical waves in film waveguides made of magnetooptical materials such as garnet crystals are studied in order to construct optical thin-film isolators using magnetooptical effects. gyrotropic yig films are fabricated on ggg crystal substrates by the rf sputtering method faraday effects in gyrotropic film waveguides are investigated for nonreciprocal guide parts of optical film devices. magnetooptical cotton-mouton effects are also studied for reciprocal parts of optical devices. birefringence effects in sputtered garnet films that are very useful for mode matching are found. by using ferrite magnets for external magnetic fields, thin-film type optical isolators of total lengths of 3. 3-4. 6 mm, consisting of bi-substituted yig films, are constructed. the isolation ratio of the isolator for forward and backward optical waves is 7. 5 db. 17 refs
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