4.6 Article

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

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SPRINGER HEIDELBERG
DOI: 10.1007/s00339-018-1986-6

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  1. NAS of Ukraine
  2. Scientific and Technological Research Council of Turkey (TUBITAK) [114F256]
  3. Ukrainian State Fund for Fundamental Research [F73/23805]
  4. Science and Technology Center in Ukraine [6174]

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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.

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