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Chopped nonlinear magneto-optic rotation: A technique for precision measurements

Ravishankar, Harish and Chanu, Sapam Ranjita and Natarajan, Vasant (2011) Chopped nonlinear magneto-optic rotation: A technique for precision measurements. In: EPL: Europhysics Letters, 94 (5).

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Official URL: http://iopscience.iop.org/0295-5075/94/5/53002/


We have developed a technique for precise measurement of small magnetic fields using nonlinear magneto-optic rotation (NMOR). The technique relies on the resonant laser beam being chopped. During the on time, the atoms are optically pumped into an aligned ground state (Delta m=2 coherence). During the off time, they freely precess around the magnetic field at the Larmor frequency. If the on-off modulation frequency matches (twice) the Larmor precession frequency, the rotation is resonantly enhanced in every cycle, thereby making the process like a repeated Ramsey measurement of the Larmor frequency. We study chopped-NMOR in a paraffin-coated Cs vapor cell. The out-of-phase demodulated rotation shows a Lorentzian peak of linewidth 85 mu G, corresponding to a sensitivity of 0.15nG/root Hz. We discuss the potential of this technique for the measurement of an atomic electric-dipole moment. Copyright (C) EPLA, 2011

Item Type: Journal Article
Additional Information: Copyright of this article belongs to EDP Sciences.
Department/Centre: Division of Physical & Mathematical Sciences > Physics
Depositing User: Id for Latest eprints
Date Deposited: 15 Jun 2011 06:00
Last Modified: 15 Jun 2011 06:00
URI: http://eprints.iisc.ac.in/id/eprint/38256

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