Publication

Operation of a quasi-optical gyrotron with a Gaussian output coupler

Minh Quang Tran, Jean-Philippe Hogge, Trach-Minh Tran
1996
Journal Articles

Abstract

The operation of a 92 GHz quasi-optical gyrotron having a resonator formed by a spherical mirror and a diffraction grating placed in -1 order Littrow mount is presented. A power of 150 kW with a Gaussian output pattern was measured. The Gaussian content in the output was 98% with less than 1% of depolarization. By optimizing the magnetic field al fixed frequency a maximum efficiency of 15% was reached. (C) 1996 American Institute of Physics.

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https://infoscience.epfl.ch/entities/publication/6dac30ee-1553-4f5b-87da-14f11bed4c13

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Minh Quang Tran, Jean-Philippe Hogge, Trach-Minh Tran
1996
Journal Articles

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/6dac30ee-1553-4f5b-87da-14f11bed4c13

About this result

Related concepts (28)

Fraunhofer diffraction

In optics, the Fraunhofer diffraction equation is used to model the diffraction of waves when plane waves are incident on a diffracting object, and the diffraction pattern is viewed at a sufficiently long distance (a distance satisfying Fraunhofer condition) from the object (in the far-field region), and also when it is viewed at the focal plane of an imaging lens. In contrast, the diffraction pattern created near the diffracting object and (in the near field region) is given by the Fresnel diffraction equation.

Diffraction

Diffraction is the interference or bending of waves around the corners of an obstacle or through an aperture into the region of geometrical shadow of the obstacle/aperture. The diffracting object or aperture effectively becomes a secondary source of the propagating wave. Italian scientist Francesco Maria Grimaldi coined the word diffraction and was the first to record accurate observations of the phenomenon in 1660.

Curved mirror

A curved mirror is a mirror with a curved reflecting surface. The surface may be either convex (bulging outward) or concave (recessed inward). Most curved mirrors have surfaces that are shaped like part of a sphere, but other shapes are sometimes used in optical devices. The most common non-spherical type are parabolic reflectors, found in optical devices such as reflecting telescopes that need to image distant objects, since spherical mirror systems, like spherical lenses, suffer from spherical aberration.

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Operation of a quasi-optical gyrotron with a Gaussian output coupler

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