Experimental studies of polarization spectroscopy in dye solutions

By changing solvent species, concentration of dye, and state of polarization of the pumping beam, experimental investigations have been made of the central thermal spike which has been frequently observed in polarization spectroscopy. From these investigations it was found that the spectrum in a dilute aqueous solution is rarely degraded by the influence of the thermal effect and it was also found that measurement of polarization dependence enables us to extract the contribution of the thermal spike. From the spectra without the thermal spike, absorption recovery times have been obtained in several dyes.