Phys. Rev. A 73, 053404 (2006) [8 pages]Nonlinear magneto-optical rotation with frequency-modulated light in the geophysical field rangeReceived 15 February 2006; published 17 May 2006 Recent work investigating resonant nonlinear magneto-optical rotation (NMOR) related to long-lived (τrel∼1s) ground-state atomic coherences has demonstrated potential magnetometric sensitivities exceeding 10−11 G∕√Hz for small (≲1 μG) magnetic fields. In the present work, NMOR using frequency-modulated light (FM NMOR) is studied in the regime where the longitudinal magnetic field is in the geophysical range(∼500mG), of particular interest for many applications. In this regime a splitting of the FM NMOR resonance due to the nonlinear Zeeman effect is observed. At sufficiently high light intensities, there is also a splitting of the FM NMOR resonances due to ac Stark shifts induced by the optical field, as well as evidence of alignment-to-orientation conversion type processes. The consequences of these effects for FM-NMOR-based atomic magnetometry in the geophysical field range are considered. © 2006 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevA.73.053404
DOI:
10.1103/PhysRevA.73.053404
PACS:
32.80.Bx, 07.55.Ge, 42.65.−k
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