Crack-free conditions in welding of glass by ultrashort laser pulse
Miyamoto I, Cvecek K, Schmidt M (2013)
Publication Type: Journal article
Publication year: 2013
Journal
Book Volume: 21
Pages Range: 14291-14302
Journal Issue: 12
DOI: 10.1364/OE.21.014291
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 Optical Society of America.
Authors with CRIS profile
Involved external institutions
Osaka University
Japan (JP)
Bayerisches Laserzentrum gemeinnützige Forschungsgesellschaft mbH (BLZ)
Germany (DE)
Japan (JP)
Bayerisches Laserzentrum gemeinnützige Forschungsgesellschaft mbH (BLZ)
Germany (DE)
How to cite
APA:
Miyamoto, I., Cvecek, K., & Schmidt, M. (2013). Crack-free conditions in welding of glass by ultrashort laser pulse. Optics Express, 21(12), 14291-14302. https://dx.doi.org/10.1364/OE.21.014291
MLA:
Miyamoto, Isamu, Kristian Cvecek, and Michael Schmidt. "Crack-free conditions in welding of glass by ultrashort laser pulse." Optics Express 21.12 (2013): 14291-14302.
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