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The usual configuration of uniaxial whispering gallery mode resonators is adisk shaped geometry where the optic axis points along the symmetry axis, a socalled z-cut resonator. Recently x-cut resonators, where the optic axis lies inthe equatorial plane, became of interest as they enable extremely broadbandsecond harmonic generation. In this paper we report on the properties of a moregeneralized system, the so called angle-cut resonator, where the optic axisexhibits an arbitrary angle against the symmetry axis. We show experimentallythat the modal structure and quality factors are similar to common resonatorsbut that the polarization properties differ quite significantly: due to theasymmetry the polarization depends on the equatorial position and is, ingeneral, elliptical.

Experimental characterization of an uniaxial angle cut whispering gallery mode resonator