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MAGICTRAC, a novel method for conversion of whispering-gallery modes into a free-space Gaussian-like beam

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Abstract

A novel device, MAGICTRAC, is described for efficient conversion at millimeter wavelengths of the TE m,n whispering-gallery mode into a linearly polarized, free-space Gaussian-like beam. MAGICTRAC uses a mode-converting waveguide taper and three mirror optics, one of which incorporates a twist reflector to linearly polarize the output beam. An example design is presented for the TE15,2 mode at 140 GHz with a calculated efficiency of 96%. Related possible applications include (1) installation of the MAGICTRAC within the vacuum envelope of a gyrotron to separarate the spent e-beam from the generated rf, (2) generation of a whispering-gallery mode by injection of a Gaussian-like beam into the output end, and (3) conversion of TE m,n modes into TE0n modes for low-loss transmission in smooth-wall waveguide.

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Authors and Affiliations

  1. Lawrence Livermore National Laboratory, 94551, Livermore, CA

    B. W. Stallard, J. A. Byers & M. A. Makowski

Authors
  1. B. W. Stallard
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  2. J. A. Byers
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  3. M. A. Makowski
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Additional information

Work performed by LLNL for USDOE under contract W-7405 ENG-48.

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Stallard, B.W., Byers, J.A. & Makowski, M.A. MAGICTRAC, a novel method for conversion of whispering-gallery modes into a free-space Gaussian-like beam. Int J Infrared Milli Waves 11, 1011–1032 (1990). https://doi.org/10.1007/BF01008566

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  • DOI: https://doi.org/10.1007/BF01008566

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