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Optics Express

Optics Express

  • Editor: Andrew M. Weiner
  • Vol. 21, Iss. 12 — Jun. 17, 2013
  • pp: 14291–14302

Crack-free conditions in welding of glass by ultrashort laser pulse

Isamu Miyamoto, Kristian Cvecek, and Michael Schmidt  »View Author Affiliations


Optics Express, Vol. 21, Issue 12, pp. 14291-14302 (2013)
http://dx.doi.org/10.1364/OE.21.014291


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Abstract

The spatial distribution of the laser energy absorbed by nonlinear absorption process in bulk glass w(z) is determined and thermal cycles due to the successive ultrashort laser pulse (USLP) is simulated using w(z) based on the transient thermal conduction model. The thermal stress produced in internal melting of bulk glass by USLP is qualitatively analyzed based on a simple thermal stress model, and crack-free conditions are studied in glass having large coefficient of thermal expansion. In heating process, cracks are prevented when the laser pulse impinges into glass with temperatures higher than the softening temperature of glass. In cooling process, shrinkage stress is suppressed to prevent cracks, because the embedded molten pool produced by nonlinear absorption process behaves like an elastic body under the compressive stress field unlike the case of CW-laser welding where the molten pool having a free surface produced by linear absorption process is plastically deformed under the compressive stress field.

© 2013 OSA

OCIS Codes
(140.3390) Lasers and laser optics : Laser materials processing
(140.3440) Lasers and laser optics : Laser-induced breakdown
(140.7090) Lasers and laser optics : Ultrafast lasers
(160.2750) Materials : Glass and other amorphous materials
(190.4180) Nonlinear optics : Multiphoton processes

ToC Category:
Lasers and Laser Optics

History
Original Manuscript: January 22, 2013
Revised Manuscript: April 6, 2013
Manuscript Accepted: April 10, 2013
Published: June 7, 2013

Citation
Isamu Miyamoto, Kristian Cvecek, and Michael Schmidt, "Crack-free conditions in welding of glass by ultrashort laser pulse," Opt. Express 21, 14291-14302 (2013)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-21-12-14291


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