Nanosecond photoacoustic studies on ultraviolet laser ablation of organic polymers

摘要

Wide bandwidth polyvinylidenefluoride film piezoelectric transducers have been used to make timehyphen;resolved measurements of stress waves generated by ablation and subthreshold thermoelastic mechanisms in excimer laser irradiated polymers. At high fluence, ablation commences within 4ndash;6 ns of the start of the laser pulse and generates short acoustic impulses (sim;20 ns) with peak stresses ge;107Pa (sim;100 atm).