First-principles calculation of multiphoton absorption cross section of α-quartz under femtosecond laser irradiation

Dong Yu, Lan Jiang, Feng Wang, Liangti Qu, Yongfeng Lu

Research output: Contribution to journalArticle

4 Scopus citations

Abstract

Time-dependent density functional theory-based first-principles calculations have been used to study the ionization process and electron excitation. The results show that the number of excited electrons follows the power law σkIk at peak intensities of I < 5 × 1013 W/cm2, indicating that the multiphoton ionization plays a key role. The multiphoton absorption cross section of α-quartz σk is further calculated to be 3.54 × 1011 cm−3 ps−1 (cm2/TW)6. Using the plasma model, the theoretical results of the damage threshold fluences are consistent with the experimental data, which validates the calculated value of multiphoton absorption cross section. By employing the calculated cross section value in the plasma model, the damage threshold fluences are theoretically estimated, being consistent with the experimental data, which validates the calculated value of multiphoton absorption cross section. The preliminary multiscale model shows great potential in the simulation of laser processing.

Original languageEnglish (US)
Article number494
JournalApplied Physics A: Materials Science and Processing
Volume122
Issue number5
DOIs
StatePublished - May 1 2016

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Science(all)

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