Reliable and strong micro-welding of glass by ultrashort pulsed laser

Yasuhiro Okamoto, Zhiyong Ouyang, Akira Okada

Research output: Chapter in Book/Report/Conference proceedingConference contribution


Ultrashort pulsed laser has been expected to be a powerful and reliable tool for micro-welding of glass. Picosecond pulsed laser with high pulse repetition rate leads to melting of glass at the vicinity of focal region by the heat accumulation, in which the absorption point of laser energy moves periodically in beam axis. Thus, the control of focusing situation in beam axis is very important to investigate the mechanical strength of weld part. In the microwelding of borosilicate glass by picosecond pulsed laser of 1064 nm, characteristics of molten area creation and weld joint were discussed. Numerical aperture (N.A.) greatly affects characteristics of molten area formation, and superior focusing characteristics, such as N.A. 0.65 enable a long region of high power density in beam axis, which can create a large molten area without cracks even under high energy condition. An appropriately large molten area inside glass has high mechanical strength, when continuous and large molten areas were formed. In addition, high density and large size of molten area without crack led to increasing Young's modulus, and uniform and high Young's modulus of molten area results in higher breaking stress.

Original languageEnglish
Title of host publicationFrontiers in Ultrafast Optics
Subtitle of host publicationBiomedical, Scientific, and Industrial Applications XXI
EditorsPeter R. Herman, Michel Meunier, Roberto Osellame
ISBN (Electronic)9781510641877
Publication statusPublished - 2021
EventFrontiers in Ultrafast Optics: Biomedical, Scientific, and Industrial Applications XXI 2021 - Virtual, Online, United States
Duration: Mar 6 2021Mar 11 2021

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
ISSN (Print)0277-786X
ISSN (Electronic)1996-756X


ConferenceFrontiers in Ultrafast Optics: Biomedical, Scientific, and Industrial Applications XXI 2021
Country/TerritoryUnited States
CityVirtual, Online


  • Glass
  • Micro-welding
  • Numerical aperture
  • Picosecond pulsed laser
  • Young's modulus

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering


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