Ablation thresholds and morphological changes of poly‐l‐lactic acid for pulse durations in the femtosecond‐to‐picosecond regime. (3rd June 2020)

• Record Type: Journal Article
• Authors: Shibuya, Tatsunori; Yoshitomi, Dai; Satoh, Daisuke; Sakaue, Kazuyuki; Tanaka, Masahito; Takada, Hideyuki; Ogawa, Hiroshi; Torizuka, Kenji; Kobayashi, Yohei; Kuroda, Ryunosuke
• Other Names: Oswald Steffen guestEditor.; Watts John F. guestEditor.; Abel Marie‐Laure guestEditor.
• Is Part Of: Surface and interface analysis. Volume 52:Number 12(2020)
• Page Start: 1145
• Page End: 1149
• Publication Date: 2020-06-03
• Subjects: laser damage morphology -- laser damage thresholds -- poly‐l‐lactic acid (PLLA) -- ultrafast laser processing; Surfaces (Physics) -- Periodicals; Surface chemistry -- Periodicals; Thin films -- Periodicals; 541.33
• DOI: 10.1002/sia.6824
• Languages: English
• ISSNs: 0142-2421

Abstract

Abstract : 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.