Collisional depolarization of the atomic Cs-$6s^{2}S_{1/2}\rightarrow10s^{2}S_{1/2}$ transition with argon buffer gas

We report an experimental investigation of collisional depolarization of the atomic cesium $6s^{2}S_{1/2}\rightarrow 10s^{2}S_{1/2}$ two-color two-photon polarization spectrum. The Ar pressure dependence of the spectrum revealed strong depolarization in the vicinity of the $6s^{2}S_{1/2}\rightarrow6p^{2}P_{3/2}\rightarrow10s^{2}S_{1/2}$ 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 $cm^{-1}$ range. In the absence of collisions, the measured polarization spectrum is in excellent agreement with calculations. The polarization measurement on the $6s^{2}S_{1/2}\rightarrow6p^{2}P_{3/2}\rightarrow10s^{2}S_{1/2}$ transition and an overview of the experimental techniques of our results are also presented.