Effect of focusing condition on molten area characteristics in micro-welding of borosilicate glass by picosecond pulsed laser

I. H.W. Nordin, Y. Okamoto, A. Okada, T. Takekuni, T. Sakagawa

Research output: Contribution to journalArticlepeer-review

8 Citations (Scopus)

Abstract

The characteristics of the molten area are attributed not only by laser energy condition but also the focusing condition. In this study, a picosecond pulsed laser of 1064 nm in wavelength and 12.5 ps in pulse duration was used as a laser source for joining glass material. Influence of focusing condition on micro-welding of glasses was experimentally investigated by using an objective lens with and without spherical aberration correction, and its molten area was characterized. The usage of objective lens with spherical aberration correction led to a larger molten area inside the bulk material of glass even under the same pulse energy, which related to the efficient micro-welding of glass materials. In addition, an optical system with the spherical aberration correction led to a stable absorption of laser energy inside the bulk glass material, stabilizing the shape of molten area, which resulted in the reliable weld joint. On the other hand, breaking strength of the specimens with spherical aberration correction was higher than that without spherical aberration correction. Therefore, it is concluded that the focusing condition with spherical aberration correction led to the larger and stable molten area, which resulted in higher joining strength in micro-welding of glass materials.

Original languageEnglish
Article number492
JournalApplied Physics A: Materials Science and Processing
Volume122
Issue number5
DOIs
Publication statusPublished - May 1 2016

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Science(all)

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