  Laser-plasma instability (LPI) is one of the main obstacles in laser-driven
inertial confinement fusion (ICF) for achieving predictable and reproducible
fusion at high gain. For the first time we have proved analytically and
confirmed with three-dimensional particle-in-cell simulations that angular
incoherence has additional and much stronger suppression of the instability
growth rate than the well-known temporal incoherence and spatial incoherence
usually used in ICF studies. For the model used in our calculations, the
maximum field ratio between the stimulated Raman scattering and the driving
pulses drops from 0.2 for the Laguerre-Gaussian pulse with a single non-zero
topological charge to 0.05 for the super light spring with an angular momentum
spread and random relative phases. In particular, angular incoherence does not
introduce extra undesirable hot electrons. This opens a novel way to suppress
LPI with the light of an angular momentum spread and paves the way towards a
low LPI laser system with a super light spring of incoherence in all dimensions
of time, space, and angle.
