TIME-RESOLVED DYNAMICS OF SUBPICOSECOND LASER ABLATION

被引：108
作者：
PREUSS, S
SPATH, M
ZHANG, Y
STUKE, M
机构：
[1] Max-Planck-Institut für Biophysikalische Chemie, W-3400 Göttingen
来源：
APPLIED PHYSICS LETTERS | 1993年 / 62卷 / 23期
关键词：
D O I：
10.1063/1.109135
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
The ablation of lithium niobate (LiNbO3), POLY(tetrafluoroethylene) (PTFE, teflon), poly(methylmethacrylate) (PMMA) and polyimide (PI) by 500 fs UV excimer laser pulses at 248 nm is reported. Time-resolved measurements were carried out with pulse pairs of variable delay in the range from -200 to +200 ps. The ablation rate is very sensitive to the time delay between the two pulses, and -depending on the material and fluence-can increase or decrease for very short time delays. For LiNbO3, efficient shielding is observed within a few picoseconds. For PTFE and PMMA, and the total fluence just above threshold, the ablation rate versus time delay shows an autocorrelation type behavior with a full width at half-maximum below 400 fs, since two-photon absorption dominates the ablation process. For polyimide, excited state absorption is found to decrease the ablation rate for delay times below 30 ps.
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页码：3049 / 3051
页数：3
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