Optical rotation in excess of 100 rad generated by Rb vapor in a multipass cell

S. Li, P. Vachaspati, D. Sheng, N. Dural, M. V. Romalis

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57 Scopus citations


Paramagnetic Faraday rotation is a powerful technique for atom sensing widely used in quantum nondemolition measurements, fundamental symmetry tests, and other precision measurements. We demonstrate the use of a multipass optical cell for Faraday rotation spectroscopy and observe polarization rotation in excess of 100 rad from spin-polarized Rb vapor. Unlike optical cavities, multipass cells have a deterministic number of light passes and can be used to measure large optical rotations. We also observe a tenfold suppression of transverse spin relaxation when Rb atoms are placed in a coherent superposition state immune to spin-exchange collisions.

Original languageEnglish (US)
Article number061403
JournalPhysical Review A - Atomic, Molecular, and Optical Physics
Issue number6
StatePublished - Dec 6 2011

All Science Journal Classification (ASJC) codes

  • Atomic and Molecular Physics, and Optics


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