Abstract
The 355-nm transient absorption of polyimide thin films has been measured following excitation withsubablative, 24-ps long, 355-nm laser pulses. The 355-nm absorption increases by 25% following 355-nm, 20 mJ/cm2 excitation and recovers with a fast time constant ≈34 ps, and a slow time constant which is much longer than 6 ns. The data are fitted by a three-level rate equation model incorporating the temperature dependence of the ground state absorption coefficient. The fast component is attributed to the decay ofS 1 and the slow component results from increased ground state absorption caused by a laser-induced temperature rise. The nonlinear intensity dependence is attributed to excited state (S 1) absorption. These results indicate the importance of considering the dynamic absorption in modelling ablation.
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Frisoli, J.K., Hefetz, Y. & Deutsch, T.F. Time-resolved UV absorption of polyimide. Appl. Phys. B 52, 168–172 (1991). https://doi.org/10.1007/BF00750946
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DOI: https://doi.org/10.1007/BF00750946