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
lam : wavelength
w2 waist radius of the targeted circular beam after refraction through the optical system
zx : distance from the lens working in the XZ plane to the waist of the incident beam
fix : effective focal length of the cylindrical lens working in the XZ plane
fiy1 : effective focal length of the first cylindrical lens of the afocal system working in the YZ plane
fiy2 : effective focal length of the second cylindrical lens of the afocal system working in the YZ plane
e : distance between the waists of the incident and refracted beams