A closed form of a kurtosis parameter of a hypergeometric-Gaussian type-II beam
Khannous F, Ebrahim A A A, Belafhal A†,
       

Intensity distributions of the HyGG-II beam each as a function of r with λ = 0.6328 μm, p = 1.2, ω0 = 2 mm for z = zR (a) and 4zR (b).