Abstract
In this work, the stability of short-wavelength spatial modes in quarter-disk cavities was studied. It was found that in such resonators, short-wave modes (with wavelengths λ smaller than the radius R of the quarter-disk λ<<R) in space form figures similar to folded twice m-polygons. The m-order of allowed stable modes decreases rapidly with an increase in the δ/R parameter of deviation from the ideal quarter-disk shape. Unlike half-disk resonators, quarter-disk resonators with δ/R>0.1 lack total internal reflection modes.
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