Femtosecond filamentation and supercontinuum generation in bulk silicon

We experimentally study filamentation and supercontinuum generation in bulk silicon crystal using femtosecond mid-infrared pulses with carrier wavelengths in the range of 3.25-4.7 μm, in the presence of three-, four-, and five-photon absorption. Spectral measurements show a fairly stable blueshifted...

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Bibliographic Details
Published in:Optics letters 2019-03, Vol.44 (6), p.1343-1346
Main Authors: Marcinkevičiūtė, A, Jukna, V, Šuminas, R, Garejev, N, Tamošauskas, G, Dubietis, A
Format: Article
Language:English
Subjects:
Femtosecond pulses
Photon absorption
Silicon
Splitting
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Summary:We experimentally study filamentation and supercontinuum generation in bulk silicon crystal using femtosecond mid-infrared pulses with carrier wavelengths in the range of 3.25-4.7 μm, in the presence of three-, four-, and five-photon absorption. Spectral measurements show a fairly stable blueshifted cutoff in the 2.5-2.7 μm range and gradual increase of the long-wave extent with increasing wavelength of the incident pulses, eventually yielding an octave-spanning supercontinuum, covering the wavelength range from 2.5 to 5.8 μm with the input pulses at 4.7 μm. The recorded spatiotemporal intensity distributions of a single filament revealed pulse splitting after the nonlinear focus, in line with the pulse-splitting-based filamentation scenario inherent to normally dispersive dielectric nonlinear media.
ISSN:0146-9592
1539-4794
DOI:10.1364/OL.44.001343