Applied Physics A

, 85:39

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


DOI: 10.1007/s00339-006-3648-3

Cite this article as:
Kawamura, D., Takita, A., Hayasaki, Y. et al. Appl. Phys. A (2006) 85: 39. doi:10.1007/s00339-006-3648-3


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.

Copyright information

© Springer-Verlag 2006

Authors and Affiliations

  • D. Kawamura
    • 1
  • A. Takita
    • 1
  • Y. Hayasaki
    • 1
  • N. Nishida
    • 1
  1. 1.Department of Optical Science and Technology, Faculty of EngineeringThe University of TokushimaTokushimaJapan