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

Amy Watkins; Vibhuti Bhushan Tiwari; Jonathan M. Ward; Kieran Deasy; Síle Nic Chormaic

doi:10.1117/12.2027163

18 November 2013 Observation of Zeeman shift in the rubidium D₂ line using an optical nanofiber in vapor

Amy Watkins, Vibhuti Bhushan Tiwari, Jonathan M. Ward, Kieran Deasy, Síle Nic Chormaic

Proceedings Volume 8785, 8th Iberoamerican Optics Meeting and 11th Latin American Meeting on Optics, Lasers, and Applications; 87850S (2013) https://doi.org/10.1117/12.2027163
Event: 8th Ibero American Optics Meeting/11th Latin American Meeting on Optics, Lasers, and Applications, 2013, Porto, Portugal

Abstract

We report on the observation of a Zeeman shift (order of 100 MHz) of the Doppler-broadened D₂ transition of both ⁸⁵Rb and ⁸⁷Rb isotopes via transmission through a 400 nm diameter optical nanofiber in the presence of a DC magnetic field. Linearly-polarized light propagating in the nanofiber is analyzed as a superposition of two orthogonally circularly polarized orientations, σ+ and σ-. In the absence of the magnetic field, the absorption of these polarizations by the atomic vapor, via the evanescent field at the waist of the nanofiber, is degenerate. When a weak magnetic field is applied parallel to the propagating light, this degeneracy is lifted and relative shifts in the resonance 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 laser lock line shape by monitoring the real-time subtraction of the two magnetically-shifted absorption spectra. This is particularly interesting for magneto-optical experiments as it could be directly implemented for diode laser frequencystabilization.

Citation Download Citation

Amy Watkins, Vibhuti Bhushan Tiwari, Jonathan M. Ward, Kieran Deasy, and Síle Nic Chormaic "Observation of Zeeman shift in the rubidium D₂ line using an optical nanofiber in vapor", Proc. SPIE 8785, 8th Iberoamerican Optics Meeting and 11th Latin American Meeting on Optics, Lasers, and Applications, 87850S (18 November 2013); https://doi.org/10.1117/12.2027163

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