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http://dx.doi.org/10.3807/KJOP.2006.17.1.001

The characteristics of nonlinear magneto-optical effect based on coherent population trapping in the D1 line of Rh atoms  

Lee, L. (Division of Physical Metrology, Korea Research Institute of Standards and Science)
Moon, H.S. (Division of Physical Metrology, Korea Research Institute of Standards and Science)
Kim, J.B. (Department of Physics Education, Korea National University of Education)
Publication Information
Korean Journal of Optics and Photonics / v.17, no.1, 2006 , pp. 1-6 More about this Journal
Abstract
We investigated the characteristics of the nonlinear magneto-optic effect (NMOE) depend on the transitions, the laser intensity and the temperature of the vapor cell, in the $D_1$ transition of $^{87}Rb$ atoms by using the Rb vapor cell contained with buffer gas of Ne 6.7 kPa. The size and the width of NMOE signal were increased according to the light intensity and temperature in the transition of F=2$\to$F'=2. However, In the case of using the F=2$\to$F'=1 transition, the size of the signal could be increased according to the light intensity without additional broadening of the width. We confirmed that the sensitivity of detecting small magnetic flux improved in this transition, and explained these effects by the different of the CPT configuration between Zeeman sublevels. At the optimal condition in experiment, the sensitivity of this system was evaluated less then $70pT/\sqrt{Hz}$.
Keywords
Atomic coherence; Coherent population trapping; Magnetometer; Nonlinear Faraday effect; Nonlinea; magneto-optic effect;
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