Polarization dependent measurements allow the investigation of polarization dependent activity of specific peaks in a Raman spectrum. This can be used to analyze molecular orientations and geometries of e.g. crystal lattices, liquid crystals, amorphous materials, or polymers.
Therefor the polarization of the excitation light can be rotated in different angles in the focal plane (e.g. parallel, perpendicular, circular, etc.) and the Raman scattered light can then be analyzed in any orientation relatively to the polarization direction of the excitation light.