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).
PDF
Chopped.pdf - Published Version Restricted to Registered users only Download (304kB) | Request a copy |
Abstract
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 |
---|---|
Publication: | EPL: Europhysics Letters |
Publisher: | EDP Sciences |
Additional Information: | Copyright of this article belongs to EDP Sciences. |
Department/Centre: | Division of Physical & Mathematical Sciences > Physics |
Date Deposited: | 15 Jun 2011 06:00 |
Last Modified: | 15 Jun 2011 06:00 |
URI: | http://eprints.iisc.ac.in/id/eprint/38256 |
Actions (login required)
View Item |