Investigation of the effects of thermally-induced band gap modification on the size and shape of modification regions formed in ultrafast laser bonding: Investigation of the effects...: C. Ungaro et al.
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| Title: | Investigation of the effects of thermally-induced band gap modification on the size and shape of modification regions formed in ultrafast laser bonding: Investigation of the effects...: C. Ungaro et al. |
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| Authors: | Ungaro, Craig1 (AUTHOR) ungaroc@corning.com, Kolesov, Grigory1 (AUTHOR), Ross, Matthew1 (AUTHOR), Liu, Ying1 (AUTHOR), Moore, Galan G.1 (AUTHOR) |
| Source: | Applied Physics A: Materials Science & Processing. Mar2025, Vol. 131 Issue 3, p1-12. 12p. |
| Subjects: | Laser welding, Multiphoton absorption, Band gaps, Absorption coefficients, Absorption spectra |
| Abstract: | Experimental observation and numerical calculation of the nonlinear absorptivity of Corning® EAGLE XG® Glass substrates under ultrafast laser irradiation at high repetition rates are presented in this work. The temperature-dependent material band gap and absorption spectrum are obtained using a quantum mechanics-based computational methodology within density functional theory. The modeling predicts an increase of the multiphoton absorption coefficient and linear thermal absorption at high temperatures due to a reduction of the band gap. The impact of thermally-induced absorption at high substrate temperatures is investigated, which allows for a more accurate prediction of heat accumulation and welding geometry in ultrafast laser welding process. [ABSTRACT FROM AUTHOR] |
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| Database: | Engineering Source |
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| Abstract: | Experimental observation and numerical calculation of the nonlinear absorptivity of Corning® EAGLE XG® Glass substrates under ultrafast laser irradiation at high repetition rates are presented in this work. The temperature-dependent material band gap and absorption spectrum are obtained using a quantum mechanics-based computational methodology within density functional theory. The modeling predicts an increase of the multiphoton absorption coefficient and linear thermal absorption at high temperatures due to a reduction of the band gap. The impact of thermally-induced absorption at high substrate temperatures is investigated, which allows for a more accurate prediction of heat accumulation and welding geometry in ultrafast laser welding process. [ABSTRACT FROM AUTHOR] |
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| ISSN: | 09478396 |
| DOI: | 10.1007/s00339-025-08330-3 |
