  We report on the generation of optical vortices with few-cycle pulse
durations, 500$\mu$J per pulse, at a repetition rate of 1 kHz. To do so, a 25
fs laser beam at 800 nm is shaped with a helical phase and coupled into a
hollow core fiber filled with argon gas, in which it undergoes self phase
modulation. 5.5 fs long pulses are measured at the output of the fiber using a
dispersion-scan setup. To retrieve the spectrally resolved spatial profile and
orbital angular momentum (OAM) content of the pulse, we introduce a method
based on spatially-resolved Fourier transform spectroscopy. We find that the
input OAM is transferred to all frequency components of the post-compressed
pulse. The combination of these two information shows that we obtain few-cycle,
high intensity vortex beams with a well-defined OAM and sufficient energy to
drive strong field processes.
