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

*此作品的通讯作者

科研成果: 期刊稿件文章同行评审

9 引用 (Scopus)

摘要

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.

源语言英语
文章编号494
期刊Applied Physics A: Materials Science and Processing
122
5
DOI
出版状态已出版 - 1 5月 2016

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