Parameters
wx : half width of the incident beam waist in the XZ plane
wy : half width of the incident beam waist in the YZ plane
z : distance from the the lens to the waist of the incident beam
lam : wavelength
fix : effective focal length of the cylindrical lens working in the XZ plane
M2x : M square factor (M2) in the XZ plane
M2y : M square factor (M2) in the YZ plane
wix : half width of the emerging beam waist in the XZ plan
wiy : half width of the emerging beam waist in the YZ plane
zix : distance from the lens to the waist of the emerging beam in the XZ plane
