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

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作者：
Viktor Kadan
Svitlana Pavlova
Ihor Pavlov
Hossein Rezaei
Ömer Ilday
Ivan Blonskyi
机构：
[1] Institute of Physics of the NAS of Ukraine,Department of Physics
[2] Bilkent University,Department of Electrical and Electronics Engineering
[3] Bilkent University,UNAM, National Nanotechnology Research Center and Institute of Materials Science and Nanotechnology
[4] Bilkent University,undefined
来源：
Applied Physics A | 2018年 / 124卷
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摘要：
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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