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We report on the observation of a Zeeman shift (order of 100 MHz) of theDoppler-broadened D2 transition of both 85Rb and 87Rb isotopes via transmissionthrough a tapered optical nanofiber in the presence of a DC magnetic field.Linearly-polarized light propagating in the nanofiber is analyzed as asuperposition of two orthogonally circularly-polarized orientations, {\sigma}+and {\sigma}-. In the absence of the magnetic field, the absorption of thesepolarizations by the atomic vapor, via the evanescent field at the waist of thenanofiber, is degenerate. When a weak magnetic field is applied parallel to thepropagating light, this degeneracy is lifted and relative shifts in theresonance frequencies are detected. Typical linear shift rates of 1.6 MHz/G and-2.0 MHz/G were observed. We also demonstrate a dichroic atomic vapor laserlock line shape by monitoring the real-time subtraction of the twomagnetically-shifted absorption spectra. This is particularly interesting formagneto-optical experiments as it could be directly implemented for diode laserfrequency-stabilization.

Observation of Zeeman shift in the rubidium D2 line using an optical nanofiber in vapor