Amplitude concentration in a phase-modulated spectrum due to femtosecond filamentation

We present a method by which the spectral intensity of an ultrafast laser pulse can be accumulated at selected frequencies by a controllable amount. Using a 4-f pulse shaper we modulate the phase of the frequency components of a femtosecond laser. By inducing femtosecond filamentation with the modul...

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Bibliographic Details
Published in:Scientific reports 2017-03, Vol.7 (1), p.43367-43367, Article 43367
Main Authors: Thompson, J. V., Zhokhov, P. A., Springer, M. M., Traverso, A. J., Yakovlev, V. V., Zheltikov, A. M., Sokolov, A. V., Scully, M. O.
Format: Article
Language:English
Subjects:
639/624/400/385
639/624/400/584
Bandwidths
Filamentation
Fourier transforms
Humanities and Social Sciences
Lasers
multidisciplinary
Science
Spectrum allocation
Spectrum analysis
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Summary:We present a method by which the spectral intensity of an ultrafast laser pulse can be accumulated at selected frequencies by a controllable amount. Using a 4-f pulse shaper we modulate the phase of the frequency components of a femtosecond laser. By inducing femtosecond filamentation with the modulated pulse, we can concentrate the spectral amplitude of the pulse at various frequencies. The phase mask applied by the pulse shaper determines the frequencies for which accumulation occurs, as well as the intensity of the spectral concentration. This technique provides a way to obtain pulses with adjustable amplitude using only phase modulation and the nonlinear response of a medium. This provides a means whereby information which is encoded into spectral phase jumps may be decoded into measurable spectral intensity spikes.
ISSN:2045-2322
2045-2322
DOI:10.1038/srep43367