15 March 2013 Temporal self-reconstruction of few-cycle nondiffracting wavepackets
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The temporal self-reconstruction of pulsed Bessel-like needle beams was studied. Arrays of nondiffracting sub-7-fs needle beams were shaped from Ti:sapphire oscillator pulses by programming multiple axicons in a phase-only spatial light modulator. Defined distortions in the time domain were induced by local spectral filtering. By differently shading parts of selected sub-beams, the self-reconstruction was analyzed under variable conditions. Pulse duration maps were measured with two-dimensional second order autocorrelation based on the Shack-Hartmann sensor principle of wavefront division. Completely distorted pulses were found to have a pulse duration of > 13 fs whereas partially distorted sub-beams returned to pulse durations close to the initial ones. Specific applications are proposed.
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S. König, M. Bock, S. K. Das, A. Treffer, R. Grunwald, "Temporal self-reconstruction of few-cycle nondiffracting wavepackets", Proc. SPIE 8611, Frontiers in Ultrafast Optics: Biomedical, Scientific, and Industrial Applications XIII, 86110S (15 March 2013); doi: 10.1117/12.2000639; https://doi.org/10.1117/12.2000639

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