Share Email Print
cover

Proceedings Paper

Sensitive optical atomic magnetometer based on nonlinear magneto-optical rotation
Author(s): Chris Hovde; Brian Patton; Eric Corsini; James Higbie; Dmitry Budker
Format Member Price Non-Member Price
PDF $14.40 $18.00
cover GOOD NEWS! Your organization subscribes to the SPIE Digital Library. You may be able to download this paper for free. Check Access

Paper Abstract

A self-oscillating magnetometer based on nonlinear magneto-optical rotation using amplitude-modulated pump light and unmodulated probe light (AM-NMOR) in 87Rb has been constructed and tested towards a goal of airborne detection of magnetic anomalies. In AM-NMOR, stroboscopic optical pumping via amplitude modulation of the pump beam creates alignment of the ground electronic state of the rubidium atoms. The Larmor precession causes an ac rotation of the polarization of a separate probe beam; the polarization rotation frequency provides a measure of the magnetic field. An anti-relaxation coating on the walls of the atomic vapor cell results in a long lifetime of 56 ms for the alignment, which enables precise measurement of the precession frequency. Light is delivered to the magnetometer by polarization-maintaining optical fibers. Tests of the sensitivity include directly measuring the beat frequency between the magnetometer and a commercial instrument and measurements of Earth's field under magnetically quiet conditions, indicating a sensitivity of at least 5 pT/νHz. Rotating the sensor indicates a heading error of less than 1 nT, limited in part by residual magnetism of the sensor.

Paper Details

Date Published: 8 May 2010
PDF: 10 pages
Proc. SPIE 7693, Unattended Ground, Sea, and Air Sensor Technologies and Applications XII, 769313 (8 May 2010); doi: 10.1117/12.850302
Show Author Affiliations
Chris Hovde, Southwest Sciences, Inc. (United States)
Brian Patton, Univ. of California, Berkeley (United States)
Eric Corsini, Univ. of California, Berkeley (United States)
James Higbie, Bucknell Univ. (United States)
Dmitry Budker, Univ. of California, Berkeley (United States)


Published in SPIE Proceedings Vol. 7693:
Unattended Ground, Sea, and Air Sensor Technologies and Applications XII
Edward M. Carapezza, Editor(s)

© SPIE. Terms of Use
Back to Top