Abstract
Zeeman splitting in the D2 line of rubidium atoms (87Rb and 85Rb) has been studied using ‘Doppler broadened’ as well as ‘saturation absorption spectroscopy’. While a linearly polarized beam was used for the former experiment, in the latter case a (π, σ±) polarization configuration was employed for both pump and probe beams. Zeeman lines have been observed by applying a field up to 5 mT. The field variation of relative line intensities in Doppler-broadened spectrum was determined following Tremblay et al and Nakayama's four-level model. For the saturation spectrum, a four-level model was used. Because the enhancement of absorption at the field is as low as 1 mT, the Fg = 2 to Fe = 3 transition for 87Rb can be used as the reference for laser locking. Level crossing is observed in 85Rb at fields less than 5 mT.
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