Spatio-temporal dynamics of femtosecond laser pulses at 1550 nm wavelength in crystal silicon
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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 µm, generation of visible third harmonics was also observed in c-Si.
We acknowledge support from the NAS of Ukraine and the Scientific and Technological Research Council of Turkey (TUBITAK) (a joint research project 114F256), Ukrainian State Fund for Fundamental Research (Project F73/23805), as well as from the Science and Technology Center in Ukraine (Project 6174).
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