Equation Icon  ∘ ------------ alt -2-- -----p!---- u p,l(r,ϕ, z) = w((z) )(1+δ0lπ(|(l|+p)! e)xp(i(2(p + |l| + 1))Ψ (z)) -√2r |l| (l) 2r2-- -r2-- (148 ) × w (z) L p w(z)2 exp − ik 2q(z) cos(lϕ).