(h(x,y,z)=(Sqrt[p(x,y){1+cos[((i π)/(λ Δ(z)))((x^2)+(y^2))]}])=(Sqrt[2])p(x,y)cos[((i π)/(2λ Δ(z)))((x^2)+(y^2))]=(Subscript[p, z])(x,y){(1/(Sqrt[2]))exp[((i π((x^2)+(y^2)))/(2λ Δ (z)))]+(1/(Sqrt[2]))exp[((-i π((x^2)+(y^2)))/(2λ Δ(z)))]}(26))