Meeting of the Division of Atomic, Molecular and Optical Physics, Nebraska, Amerika Birleşik Devletleri, 17 - 21 May 2005
We report an experimental investigation of collisional depolarization of the atomic cesium two-color two-photon polarization spectrum. The Ar pressure dependence of the spectrum revealed strong depolarization in the vicinity of the stepwise resonances using short pulse pump-probe technique. The linear polarization degree was measured with the first laser tuned to resonance and the second laser tuned within a \pm 11 range. In the absence of collisions, the measured polarization spectrum is in excellent agreement with calculations. The polarization measurement on the transition and an overview of the experimental techniques of our results are also presented.