Abstract

Multiple quasi-Bessel beams are generated by transmission of sub-30-fs pulses from a Ti:sapphire laser through refractive thin-film microaxicon arrays. Time-integrated intensity distributions at several axial positions and for pulse durations of 26 and 12.5 fs reveal significant changes of contrast, envelope function, and spatial frequency spectrum in comparison with continuous wave data. Evidence is presented that strong space–time coupling results in a time-dependent interference zone.

© 2000 Optical Society of America

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Figures (4)

Fig. 1
Fig. 1

Solid curve, thickness profile of a single microaxicon (SiO2 upon quartz, measured with a Zygo interferometer). Dashed curve, idealized cone. Inset, cut direction through the hexagonal array.

Fig. 2
Fig. 2

Time-integrated intensity patterns of quasi-Bessel beams for several pulse durations detected at several axial positions: (a) cw (reference laser), (b) 26 fs, (c) 12.5 fs (Ti:Sa laser). Minimum period, 405 µm.

Fig. 3
Fig. 3

Change in spatial frequency with pulse duration: (a) normalized radial intensity distribution, (b) corresponding Fourier spectrum (normalized amplitude; axial distance, 9 mm).

Fig. 4
Fig. 4

Spectra for two pulse durations with centers of gravity (blueshift, 3%).

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