Bump formation on a glass surface with a transparent coating using femtosecond laser processing

被引：0
作者：
D. Kawamura
A. Takita
Y. Hayasaki
N. Nishida
机构：
[1] The University of Tokushima,Department of Optical Science and Technology, Faculty of Engineering
来源：
Applied Physics A | 2006年 / 85卷
关键词：
PMMA; Femtosecond Laser; Glass Surface; Femtosecond Laser Pulse; Rear Surface;
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摘要：
The morphology of a glass surface having a transparent coating processed with focused femtosecond laser pulses is investigated. The transparent coating is formed of poly-methyl methacrylate (PMMA). When the glass was coated with a PMMA film with a thickness of 2.8 μm, bumps were formed over a wide range of axial focus positions. The same laser pulse energy produced cavities when processing bare glass with no coating. The bumps were formed as a result of suppressing material emission from the glass surface by a shielding effect of plasma generated by ablation of the PMMA film and by physical blocking of the PMMA film. A thinner film with a thickness of 0.7 μm produced a reduced shielding effect, forming an exploded bump with a small pit at its center and debris around the periphery.
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