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<p>Experimental observation and numerical calculation of the nonlinear absorptivity of Corning<sup>®</sup> EAGLE XG<sup>®</sup> 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.</p>

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Investigation of the effects of thermally-induced band gap modification on the size and shape of modification regions formed in ultrafast laser bonding

  • 期刊论文

  • 发表日期：

    2025年2月22日

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  • Craig Ungaro,
  • Grigory Kolesov,
  • Matthew Ross,
  • Ying Liu,
  • Galan G. Moore

摘要

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.