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 µm, generation of visible third harmonics was also observed in c-Si.
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Acknowledgements
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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Kadan, V., Pavlova, S., Pavlov, I. et al. Spatio-temporal dynamics of femtosecond laser pulses at 1550 nm wavelength in crystal silicon. Appl. Phys. A 124, 560 (2018). https://doi.org/10.1007/s00339-018-1986-6
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DOI: https://doi.org/10.1007/s00339-018-1986-6