Nonlinear ionization mechanism dependence of energy absorption in diamond under femtosecond laser irradiation

Cong Wang, Lan Jiang, Xin Li, Feng Wang, Yanping Yuan, Liangti Qu, Yongfeng Lu

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We present first-principles calculations for nonlinear photoionization of diamond induced by the intense femtosecond laser field. A real-time and real-space time-dependent density functional theory with the adiabatic local-density approximation is applied to describe the laser-material interactions in the Kohn-Sham formalism with the self-interaction correction. For a certain laser wavelength, the intensity dependence of energy absorption on multiphoton and/or tunnel ionization mechanisms is investigated, where laser intensity regions vary from 1012 W/cm2 to 1016 W/cm2. In addition, the effect of laser wavelength on energy absorption at certain ionization mechanism is discussed when the Keldysh parameter is fixed. Theoretical results show that: (1) at the fixed laser wavelength, the relationship between the energy absorption and laser intensity shows a good fit of E cMIN (N is the number of photons absorbed to free from the valence band) when multiphoton ionization dominates; (2) while when tunnel ionization becomes significant, the relationship coincides with the expression of E cTIn (n N).

Original languageEnglish (US)
Article number143106
JournalJournal of Applied Physics
Issue number14
Publication statusPublished - Apr 14 2013


ASJC Scopus subject areas

  • Physics and Astronomy(all)

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