Laser properties of beet dyes

Abstract

This research was carried out to study the possibility of using the beet dyes as a laser gain medium. Also the pH effect on the light absorption by beet dyes was studied and the dyes solution was separated using HPLC-absorption and HPLC fluorescence techniques to get information about the number of the components present in the dye solution and both techniques give the same result indicating the presence of four components. The dye solutions were pumped by He-Ne flash lamb laser and the fluorescence efficiency was displayed by (usb 2000 spectrophotometer detector). The fluorescence quantum yield was determined by the comparative method with rodamine b as an organic dye standard, the value of the fluorescence quantum yield was found about (0.14) and the fluorescence quantum yield was developed until reached about (0.323). The increasing of fluorescence quantum yield of dye solution as a result of increasing the viscosity of solvent was observed clearly. The study concluded the beet dyes are so sensitive to fluorescence and it is very suitable to be used as a laser gain medium.