Time dependence of hole spectrum due to dispersive burning kinetics in dye-doped polymers

Abstract

Time evolution of a persistent hole spectrum has been investigated for dyes doped in polyvinyl alcohol films at 2 K. The zero-phonon hole profile measured for resorufin using a single-mode dye laser has been found to be nearly Lorentzian even in the case of relatively deep holes. The observed fluence-dependent depth and width of the zero-phonon hole are reproduced well by the numerical simulation based on a dispersive burning-kinetics model. It is pointed out that a large distribution of the burning rate is responsible for the fluence-dependent hole broadening. Time evolution of the phonon-sideband hole simulated using the same model is also compared with the experimental data. It is shown that the low-energy sideband hole is enhanced when the burning kinetics is dispersive.