  Self-healing, as an exotic effect, has showed many potential applications. In
this paper, we focus on the self-healing effect of Laguerre-Gaussian beams
after an obstacle. By taking advantage of angular spectrum theory, we study
self-healing limit of the beam against on-axis obstacle. The dependence of
self-healing capability on the radius of obstacle is analyzed. Additionally, we
briefly discuss the self-healing limit of the beam in an off-axis scenario. Our
results indicate that field amplitude of the beam will be healed well when the
obstacle is approximately on-axis without oversized radius, perhaps providing
advantages for optical communication, imaging, and remote sensing systems.
