Volume 94, Number 5, June 2011
|Number of page(s)||5|
|Section||Atomic, Molecular and Optical Physics|
|Published online||24 May 2011|
Chopped nonlinear magneto-optic rotation: A technique for precision measurements
Department of Physics, Indian Institute of Science - Bangalore 560 012, India
Accepted: 19 April 2011
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 (Δm=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 μG, corresponding to a sensitivity of . We discuss the potential of this technique for the measurement of an atomic electric-dipole moment.
PACS: 33.57.+c – Magneto-optical and electro-optical spectra and effects / 32.80.Xx – Level crossing and optical pumping / 42.50.Gy – Effects of atomic coherence on propagation, absorption, and amplification of light; electromagnetically induced transparency and absorption
© EPLA, 2011
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.