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

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.