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We present an application of the Faraday effect to produce a narrow bandatomic filter in an alkali metal vapor. In our experiment two Raman beamsseparated in frequency by the ground state hyperfine splitting in 87Rb areproduced using an EOM and then filtered using the Faraday effect in anisotopically pure 85Rb thermal vapor. An experimental transmission spectra forthe filter is presented along with a theoretical calculation. The performanceof the filter is then demonstrated and characterized using a Fabry-Perotetalon. For a temperature of 70 degrees and a longitudinal magnetic field of 80G a suppression to -18 dB is achieved, limited by the quality of thepolarizers.

Faraday filtering of Raman light in an isotopically pure alkali metal vapor