Magneto-optical effects in a high-$Q$ whispering-gallery-mode resonator with a large Verdet constant

TL;DR

This paper investigates magneto-optical effects in a high-Q whispering-gallery-mode resonator made from a Faraday-rotator material, demonstrating significant eigenfrequency shifts and polarization changes, supported by an analytical model.

Contribution

It presents the first high-Q WGMR from a Faraday-rotator material with a record quality factor and develops an analytical model for magnetic field effects in such resonators.

Findings

Record quality factor ($Q=1.45\times10^8$) achieved in a Faraday-rotator WGMR.

Experimental measurement of eigenfrequency deviations under magnetic fields.

Development of an analytical model for magneto-optic effects in birefringent WGMRs.

Abstract

We have studied magneto-optical effects in an optical whispering-gallery-mode resonator (WGMR) manufactured from a Faraday-rotator material with, to the best of our knowledge, the record quality factor ($Q = 1.45\times10^8$) achieved for such materials. We have experimentally measured the eigenfrequencies deviation amplitude under the application of an external magnetic field and demonstrated the polarization plane declination over the light path. An analytical model for arbitrary magnetic field geometries in magneto-optic birefringent WRMRs has been developed.