  We describe the coupling between orbital angular momentum (OAM) and temporal
degrees of freedom in pulsed Laguerre-Gauss beams. The effects of this coupling
are to increase significantly the duration of few-cycle pulses when the OAM
carried by the pulse is large, and to enhance spatiotemporal couplings.
Contrary to other detrimental but retrievable effects such as spatial, group
velocity and topological charge dispersions in these pulses, OAM-temporal
coupling effects are unavoidable, and have therefore an impact in applications
such as OAM-based optical communications, or in the generation of
vortex-carrying attosecond pulses.
