Abstract
The ablative decomposition of polymers and tissue using pulsed UV excimer radiation has been under extensive investigation.1 A model of the process of ablative decomposition2 has successfully described the ablation of polyimide and polymethylmethacrylate (PMMA) with nanosecond UV pulses but has not been as successful in predicting the ablation rates using femtosecond3 and picosecond pulses. One possible reason for such discrepancies is the occurrence of transient induced absorption or induced bleaching during and after the ablating pulse. Recent two-pulse ablation measurements on PMMA have shown enhanced ablation if two 248-nm pulses are separated by <100 ns,4 implying the existence of long- lived electronic absorption.
© 1989 Optical Society of America
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