Single-scan polarization-resolved saturated absorption spectra using hybridly polarized beam in ⁸⁵Rb atomic vapor

We report on a single-scan polarization-resolved saturated absorption spectra (SAS) method utilizing a hybridly polarized beam as the probe. Owning to the spatial-variant polarization of a hybridly polarized probe, the polarization-resolved information can be retrieved from the single signal image. Then, the polarization dependence of SAS from two transitions are investigated. Strong polarization dependence is observed from the "closed two-level transition" as |5S (1/2), F = 3> ->|5P (3/2), F = 4> of( 85)Rb. By contrast, no polarization dependence is observed from "open two-level transition" as |5S (1/2), F = 3>-> |5P 3/2, F = 3>. The method would be meaningful for the samples with poor stability or the ultrafast processes.