Equation Icon  ∘ ------- up,l(r,ϕ,z) = --1- --2p!--exp (i(2p + |l| + 1)Ψ (z )) w( (z√) ) π(|l||l|+p)!( ) ( ) (146 ) × -2r- L(pl) -2r22- exp − ik-r2-+ ilϕ , w(z) w(z) 2q(z)