Influence of numerical aperture on molten area formation in fusion micro-welding of glass by picosecond pulsed laser

Zhiyong Ouyang, Yasuhiro Okamoto, Yuta Ogino, Tomokazu Sakagawa, Akira Okada

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

Focusing condition such as numerical aperture (N.A.) has a great influence on the creation of molten area and the stable welding process in fusion micro-welding of glass. In this study, a picosecond pulsed laser of 1064 nm in wavelength and 12.5 ps in pulse duration was tightly focused inside a borosilicate glass using objective lenses of numerical apertures 0.45, 0.65, and 0.85 with spherical aberration correction. Influence of numerical aperture on molten area formation was experimentally investigated through analysis of focusing situation in glass, and movement of absorption point, and then molten area characteristics were discussed. It is concluded that N.A. of 0.65 with superior focusing characteristics can form a large and continuous molten area without cracks, which enables achievement of stable joining of glass material by picosecond pulsed laser.

Original languageEnglish
Article number1412
JournalApplied Sciences (Switzerland)
Volume9
Issue number7
DOIs
Publication statusPublished - Apr 1 2019

Keywords

  • Absorption point
  • Glass material
  • Molten area
  • Numerical aperture
  • Ultrashort pulsed laser

ASJC Scopus subject areas

  • Materials Science(all)
  • Instrumentation
  • Engineering(all)
  • Process Chemistry and Technology
  • Computer Science Applications
  • Fluid Flow and Transfer Processes

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