The principle of measuring magnetic fields with a ring laser system is discussed. The main source of error, the Zeeman effect, is studied, and a corresponding technique to reduce it is described. An experimental setup is developed with a Faraday cell of a large product of the Verdet constant and the length. The experimental device obtains a sensitivity of 0.5 nT and a stability of 2 nT.
© 1992 Optical Society of America
Original Manuscript: December 19, 1988
Published: October 20, 1992
J. Zhang, T. Feng, S. Zhang, and G. Jin, "Measurements of magnetic fields by a ring laser," Appl. Opt. 31, 6459-6462 (1992)