An experimental demonstration of a noninvasive optical probe of magnetic fields is presented. The technique used is magnetic rotation spectroscopy of the <i>b</i><sup>1</sup>Σ<sub><i>g</i></sub><sup>+</sup> − <i>X</i><sup>3</sup>Σ<sub><i>g</i></sub><sup>−</sup> band of oxygen near 760 nm. Ambient concentrations of oxygen at atmospheric pressure are sufficient to observe substantial signals. In addition, a diode laser is used as the light source, making this a simple and compact measurement possibility.
© 1998 Optical Society of America
(020.7490) Atomic and molecular physics : Zeeman effect
(120.0120) Instrumentation, measurement, and metrology : Instrumentation, measurement, and metrology
(280.3420) Remote sensing and sensors : Laser sensors
(300.6260) Spectroscopy : Spectroscopy, diode lasers
Robert J. Brecha, "Noninvasive Magnetometry Based on Magnetic Rotation Spectroscopy of Oxygen," Appl. Opt. 37, 4834-4839 (1998)