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Ablation thresholds and morphological changes of poly‐ l ‐lactic acid for pulse durations in the femtosecond‐to‐picosecond regime
Author(s) -
Shibuya Tatsunori,
Yoshitomi Dai,
Satoh Daisuke,
Sakaue Kazuyuki,
Tanaka Masahito,
Takada Hideyuki,
Ogawa Hiroshi,
Torizuka Kenji,
Kobayashi Yohei,
Kuroda Ryunosuke
Publication year - 2020
Publication title -
surface and interface analysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.52
H-Index - 90
eISSN - 1096-9918
pISSN - 0142-2421
DOI - 10.1002/sia.6824
Subject(s) - femtosecond , ultrashort pulse , pulse duration , irradiation , picosecond , laser , materials science , polymer , pulse (music) , impact crater , optics , optoelectronics , composite material , physics , astronomy , detector , nuclear physics
Biodegradable polymers such as poly‐ l ‐lactic acid (PLLA) are essential tools for a wide range of medical applications because of their mechanical robustness and bio‐affinity. Laser processing is commonly used to construct various structures from biodegradable polymers. However, in general, polymers deteriorate rapidly owing to laser‐induced heating effects. In this study, we investigate the optimum irradiation conditions for PLLA processing, using an ultrafast laser and finely controlling the pulse duration over the femtosecond‐to‐picosecond range. We report on the morphological characteristics of the craters generated by single‐shot and multiple‐shot laser irradiation under pulse duration control. Our results show that crater morphology and damage threshold in the single‐shot regime depend on pulse duration and that the degree of crater unevenness is insensitive to pulse duration in the multishot regime.