Title :
Magneto-optic waveguide isolators based on laser annealed (Bi, Ga) YIG films
Author :
Wolfe, R. ; Hegarty, J. ; Dillon, J.F., Jr. ; Luther, L.C. ; Celler, G.K. ; Trimble, L.E.
Author_Institution :
AT&T Bell Laboratories, Murray Hill, New Jersey
fDate :
9/1/1985 12:00:00 AM
Abstract :
To overcome the effects of linear birefringence which limits the Faraday rotation achievable in magneto-optic thin film waveguides, a novel geometrical pattern of Faraday effect reversals has been designed. This pattern of P/2 segments followed by a P/4 segment where P is the birefringent period, has been built permanently into a (Bi,Ga)YIG film, with composition close to the compensation point, by laser annealing. This film provides nonreciprocal rotation of ±45° for light of wavelength 1.45 μm with an extinction ratio of 500 to 1, corresponding to 27 db of isolation.
Keywords :
Faraday effect; Isolators; Laser applications, materials processing; Waveguide components; YIG films/devices; Annealing; Birefringence; Bismuth; Garnet films; Geometrical optics; Isolators; Magnetic materials; Optical films; Optical waveguides; Waveguide lasers;
Journal_Title :
Magnetics, IEEE Transactions on
DOI :
10.1109/TMAG.1985.1064080