Spatio-temporal dynamics of femtosecond laser pulses at 1550 nm wavelength in crystal silicon


Kadan V., Pavlova S., Pavlov I. , Rezaei H., Ilday O., Blonskyi I.

APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING, vol.124, no.8, 2018 (Journal Indexed in SCI) identifier identifier

  • Publication Type: Article / Article
  • Volume: 124 Issue: 8
  • Publication Date: 2018
  • Doi Number: 10.1007/s00339-018-1986-6
  • Title of Journal : APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING

Abstract

Spatio-temporal transformation of the femtosecond laser pulses at 1550 nm wavelength in c-Si is observed using the methods of time-resolved microscopy. The temporal dynamics of the pulse manifests itself both in widening of the frequency spectrum and in the change of on-axis time-width. It is shown, that along with Kerr effect, two-photon absorption also contributes to the temporal reshaping of the laser pulse. Despite the fact that absorption length for green light in c-Si is as small as 1 A mu m, generation of visible third harmonics was also observed in c-Si.