Resonant effects in nonlinear photon absorption during femtosecond laser ablation of Nd-doped silicate glass

Yadong Zhao, Lan Jiang, Juqiang Fang, Qianghua Chen, Xiaowei Li, Yongfeng Lu

Research output: Contribution to journalArticle

5 Scopus citations

Abstract

This study investigates the resonant effects in nonlinear photon absorption in femtosecond laser ablation of Nd-doped silicate glass (Nd:glass). During the femtosecond laser ablation process, the resonant ablation threshold fluence is decreased by up to 40% compared with that of ordinary ablation. However, it is found that the resonant effect is closely related with laser intensity, and lower laser intensities are required to achieve a significant enhancement. When the intensity is lower than 2.28 × 1014 W/cm2 at which multiphoton ionization dominates, resonant effect is enhanced by a factor of 1.4 to 4.4. When the intensity is higher than 2.28 × 1014 W/cm2, at which intensity tunnel ionization dominates, the resonant effect becomes weak and gradually fades away. It is shown that the resonant effect is still important for multiphoton ionization yet insignificant for tunnel ionization.

Original languageEnglish (US)
Pages (from-to)7039-7045
Number of pages7
JournalApplied optics
Volume51
Issue number29
DOIs
StatePublished - Oct 10 2012

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • Engineering (miscellaneous)
  • Electrical and Electronic Engineering

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