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Applied Optics

Applied Optics


  • Vol. 25, Iss. 21 — Nov. 1, 1986
  • pp: 3889–3895

Narrowband electrooptic tunable notch filter

Richard Lytel and George F. Lipscomb  »View Author Affiliations

Applied Optics, Vol. 25, Issue 21, pp. 3889-3895 (1986)

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We describe the theory of a narrowband electrooptic tunable filter based on a Fabry-Perot etalon with distributed Bragg reflectors. The filter can be in either bulk or waveguide form. The input to the filter must be prefiltered to the stop-band of the Bragg mirrors. Once this is accomplished, the etalon possesses a very narrow notch in the Bragg filter stop-band. The notch width is extremely narrow when the Bragg reflectance is high. The location of the notch in the Bragg stop-band is determined by the etalon cavity length and can be tuned by application of an electric field to the electrooptic material comprising the etalon cavity. Absorption in the cavity and Bragg reflectors is included in the theoretical model of the filter. The filter can be constructed from any one of several existing electrooptic organic polymer crystals, if the gratings are made either by partial polymerization of the monomer in crossed-UV beams or by corrugating the surface of the polymer. We show a theoretical example of a notch filter operating at a center wavelength of 1 μm that is 62.75 μm thick, with a notch width of under 1 Å and a transmission of 35%. This type of filter should have applications in high-speed optical modulation and Q-switches for lasers.

© 1986 Optical Society of America

Original Manuscript: June 3, 1986
Published: November 1, 1986

Richard Lytel and George F. Lipscomb, "Narrowband electrooptic tunable notch filter," Appl. Opt. 25, 3889-3895 (1986)

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