Spectral broadening and temporal compression of ~100fs pulses in air-filled hollow core capillary fibers
Spectral broadening and temporal compression of ~100fs pulses in air-filled hollow core capillary fibers
We experimentally study the spectral broadening of intense, ~100 femtosecond laser pulses at 785nm coupled into different kinds of hollow core capillary fibers, all filled with air at ambient pressure. Differently from observations in other gases, the spectra are broadened with a strong red-shift due to highly efficient intrapulse Raman scattering. Numerical simulations show that such spectra can be explained only by increasing the Raman fraction of the third order nonlinearity close to 100%. Experimentally, these broadened and red-shifted pulses do not generally allow for straightforward compression using, for example, standard chirped mirrors. However, using special hollow fibers that are internally coated with silver and polymer we obtain pulse durations in the sub-20fs regime with energies up to 300mJ.
1143-1151
Li, C.
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Rishad, K.P.M.
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Horak, P.
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Matsuura, Y.
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Faccio, D.
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2014
Li, C.
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Rishad, K.P.M.
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Horak, P.
520489b5-ccc7-4d29-bb30-c1e36436ea03
Matsuura, Y.
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Faccio, D.
439c72fc-1a71-41c2-bc41-f610ab3ddfb5
Li, C., Rishad, K.P.M., Horak, P., Matsuura, Y. and Faccio, D.
(2014)
Spectral broadening and temporal compression of ~100fs pulses in air-filled hollow core capillary fibers.
Optics Express, 22 (1), .
(doi:10.1364/OE.22.001143).
Abstract
We experimentally study the spectral broadening of intense, ~100 femtosecond laser pulses at 785nm coupled into different kinds of hollow core capillary fibers, all filled with air at ambient pressure. Differently from observations in other gases, the spectra are broadened with a strong red-shift due to highly efficient intrapulse Raman scattering. Numerical simulations show that such spectra can be explained only by increasing the Raman fraction of the third order nonlinearity close to 100%. Experimentally, these broadened and red-shifted pulses do not generally allow for straightforward compression using, for example, standard chirped mirrors. However, using special hollow fibers that are internally coated with silver and polymer we obtain pulse durations in the sub-20fs regime with energies up to 300mJ.
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Published date: 2014
Organisations:
Optoelectronics Research Centre
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Local EPrints ID: 361851
URI: http://eprints.soton.ac.uk/id/eprint/361851
ISSN: 1094-4087
PURE UUID: e1df78a2-428a-43d9-9003-1960e3713871
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Date deposited: 04 Feb 2014 15:16
Last modified: 15 Mar 2024 03:13
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Author:
C. Li
Author:
K.P.M. Rishad
Author:
Y. Matsuura
Author:
D. Faccio
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