Gyrotron and Vacuum Electronics Research
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Abstract
Abstract
Abstract The fundamental solution to Maxwell’s equations in circular, corrugated waveguides is the LP $$_{01}$$ 01 mode, also known as the HE $$_{11}$$ 11 mode, which has very low ohmic losses and is used to transport high-power mm-waves with high efficiency in many of today’s most important experimental machines for nuclear fusion. Here, we describe a quasi-optical resonator system based on a Fabry-Pérot-type cavity that consists of a lens-horn, a beam splitter, a phase-reversing mirror, and a semi-transparent mirror. This resonator resulted to be a notably effective system for achieving a high purity for the LP $$_{01}$$ 01 mode, reaching a value of 99.40% for parallel polarization and 99.55% for perpendicular polarization. The output of this source enables the measurement of ohmic losses of high-power microwave components, such as miter bends and oversized waveguides, and for studies of mode conversion using a low-power setup.
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@article{Garca2026Fabry,
title = {A Fabry-Pérot Resonant Source Enables the Generation of a High-Purity LP$$_\{01\}$$ Mode at Low Power},
author = {Carlos Refugio Muñoz García and Andreas Hentrich and W. Kasparek and Burkhard Plaum and C. Lechte and Günter E. M. Tovar},
journal = {Journal of Infrared Millimeter and Terahertz Waves},
year = {2026},
doi = {10.1007/s10762-026-01179-4},
url = {https://doi.org/10.1007/s10762-026-01179-4}
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