Journal
OPTICS EXPRESS
Volume 13, Issue 26, Pages 10729-10741Publisher
OPTICAL SOC AMER
DOI: 10.1364/OPEX.13.010729
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It has previously been realized that angle- resolved spectra (or far- field spectra) reflect in detail the complex dynamics of femtosecond pulses propagating in nonlinear dispersive media [J. Opt. Soc. Am. B 22, 862 (2005)], and thus represent a potentially useful experimental diagnostic tool. In this paper we extend an effective three- wave mixing approach previously applied to nonlinear X-waves [Phys. Rev. Lett. 92, 253901 (2004)] to the analysis of far-field spectra. Theoretical justification for the approach is presented, and a practical method is proposed that makes it possible to interpret all features of far-field spectra, and to extract quantitative information about the underlying intra-pulse dynamics. (c) 2005 Optical Society of America.
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