Abstract

Coherent optical vortices are generated from ultrashort $6.4\mathrm{fs}$ pulses. Our results demonstrate angular dispersion compensation of ultrashort $6.4\mathrm{fs}$ Laguerre–Gaussian (LG) pulses as well as what is believed to be the first direct autocorrelation measurement of $80\mathrm{fs}$ LG amplified pulses. A reflective-mirror-based $4f$-compressor is proposed to compensate the angular and group velocity dispersion of the ultrashort LG pulses.

© 2007 Optical Society of America

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