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Bragg-induced orbital angular-momentum mixing in paraxial high-finesse cavities

David H. Foster·Jens U. Noeckel
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Abstract

Numerical calculation of vector electromagnetic modes of plano-concave microcavities reveals that the polarization-dependent reflectivity of a flat Bragg mirror can lead to unexpected cavity field distributions for nominally paraxial modes. Even in a rotationally symmetric resonator, certain pairs of orbital angular momenta are necessarily mixed in an excitation-independent way to form doublets. A characteristic mixing angle is identified, which even in the paraxial limit can be designed to have large values. This correction to Gaussian theory is zeroth-order in deviations from paraxiality. We discuss the resulting nonuniform polarization fields. Observation will require small cavities with sufficiently high Q. Possible applications are proposed.

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David H. Foster, Jens U. Noeckel. 2004-12-04. Bragg-induced orbital angular-momentum mixing in paraxial high-finesse cavities. https://doi.org/10.1364/ol.29.002788

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