  The operation of polarimetric based single beam three axis atomic
magnetometer is studied. The magnetometer operates in presence of small bias
magnetic field. Its salient features are compared with the analysis of Bloch
equation. The sensitivity of the device along three orthogonal directions are
measured in low frequency regime, where 1/f noise adversely affect the
sensitivity. The cross talk among the three axes magnetic field measurements
and relative phase shifts are analysed using Lissajous plot. The sensitivity of
the magnetometer is found to be < 10 pT/sqrt(Hz) @400 mHz in any direction. The
investigated magnetometer is suitable for space application, where overall size
of the device is of prime importance.
