High-resolution saturated absorption spectroscopy of the ⁸⁵Rb D₁ line has been used for observation of the Zeeman effect by use of a diode laser with a narrow linewidth. Experimental results were compared with both Breit–Rabi theory related to shifted resonant frequencies and Nakayama’s single-cycle optical pumping theory related to signal magnitudes of signal [J. Opt. Soc. Am. B 2, 1431 (1985)]. A comparison of our results with those of Bowie et al. [J. Opt. Soc. Am. B 12, 1839 (1995)], who used perturbation theory to obtain the energy-level shifts, yielded experimental results that differ significantly in some respects.

© 1997 Optical Society of America

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