Design and cold tests of asymmetric quasioptical resonators

Richard P. Fischer, Arne W. Fliflet

Research output: Contribution to journalArticlepeer-review


This paper presents the design and test of asymmetric quasioptical resonators for gyrotron applications, where most of the diffraction output coupling comes from the smaller of two mirrors. A computer code based on scalar diffraction theory is used to calculate the resonator losses and the electric field near the mirrors. Resonators with mirror separations approaching confocal have reduced side lobes in the diffraction patterns, which should allow for better power transmission and focusing. Cold tests have been performed at 94 and 141 GHz to measure the quality factor of the asymmetric resonators as a function of mirror separation and mirror misalignment. Typical resonator parameters include 65 cm mirror separation, 1-3% output coupling, and 85% of the losses from the small mirror. A half-symmetric resonator with one flat and one curved mirror has also been investigated. The calculated values of Q are in reasonably good agreement with the cold test measurements.

Original languageEnglish (US)
Pages (from-to)1297-1313
Number of pages17
JournalInternational Journal of Infrared and Millimeter Waves
Issue number9
StatePublished - Sep 1 2002
Externally publishedYes


  • Asymmetric quasioptical resonators
  • Cold tests
  • Diffraction losses
  • Scalar diffraction theory

ASJC Scopus subject areas

  • Radiation
  • Atomic and Molecular Physics, and Optics
  • Instrumentation
  • Condensed Matter Physics
  • Physics and Astronomy (miscellaneous)
  • Electrical and Electronic Engineering

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