Quasi-optical conversion of the output from a whispering-gallery-mode gyrotron to a free-space beam with arbitrary power and phase distributions across both transverse dimensions of the beam

J. A. Lorbeck

doi:10.1117/12.2301491

1 December 1990 Quasi-optical conversion of the output from a whispering-gallery-mode gyrotron to a free-space beam with arbitrary power and phase distributions across both transverse dimensions of the beam

J. A. Lorbeck

Author Affiliations +

Proceedings Volume 1514, 15th International Conference on Infrared and Millimeter Waves; 151429 (1990) https://doi.org/10.1117/12.2301491
Event: 15th International Conference on Infrared and Millimeter Waves, 1990, Orlando, FL, United States

Abstract

A reflector-antenna synthesis procedure based on the principles of geometrical optics (GO) will be applied to the design of a quasi-optical converter which is used to transform the output of the whispering-gallery-mode (WGM) gyrotron to a freespace beam. The amplitude and phase distributions across both transverse dimensions of the free-space beam are specified as design parameters. The exact reflector surfaces which yield the desired output-beam characteristics are determined self consistently as the solutions of a system of first-order partial differential equations which we solve by progressive integration across the face of the reflectors. The synthesis procedure is anticipated to improve the output-beam characteristics of previous Vlasov-type converter designs where the power distribution could be manipulated in only one dimension across the beam which results in relatively poor free-space propagation charasteristics and reduced coupling efficiency into guided wave systems.

Citation Download Citation

J. A. Lorbeck "Quasi-optical conversion of the output from a whispering-gallery-mode gyrotron to a free-space beam with arbitrary power and phase distributions across both transverse dimensions of the beam", Proc. SPIE 1514, 15th International Conference on Infrared and Millimeter Waves, 151429 (1 December 1990); https://doi.org/10.1117/12.2301491

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KEYWORDS

Reflectors

Dysprosium

Geometrical optics

Antennas

Wave propagation

Waveguides

Beam propagation method

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