Compensators, polarized light Babinet

A synchronously pumped DCM dye laser was used as the picosecond light source in the pump-probe experiments. A Soleil-Babinet compensator in the excitation beam was set so that the polarization of the excitation and probe beams were parallel or perpendicular. Fluorescence anisotropies were measured with a Spex fluorolog spectrometer. The time resolved fluorescence was measured by single photon counting. 

This equation expresses the phase lag between x-axis polarization and y-axis polarization when the light passes through normal to the sample. The polarizer and analyzer are placed normal to each other. They are placed at 45° with respect to the x andy axes. Botii components deviate by b only when they pass through the sample. Figure 10 illustrates the principle of the measiuement. Babinet s compensator is positioned between the sample... 

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