Parameters
wo : waist radius of the incident gaussian beam
z : distance from the cylindrical lens to the waist of the incident gaussian beam
lam : wavelength
fix : effective focal length of the cylindrical lens (in the XZ plane)
M2 : M-square factor
woix : waist width of the emerging beam in the XZ plane
zix : distance from the cylindrical lens to the waist of the emerging beam in the XZ plane
wiy : width of the emerging beam in the YZ plane at the distance zix from the cylindrical lens
