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
M2x : M square factor (M2) in the XZ plane
M2y : M square factor (M2) in the YZ plane
z : distance from the vertex of the first surface of the lens to the waist of the incident beam
R1 : radius of the first surface of the lens
R2 : radius of second surface of the lens
e : lens thickness
n : refraction index before the lens
n : refraction index of the lens
n : refraction index after the lens
wix : half width of the transmitted beam waist in the XZ plan
wiy : half width of the transmitted beam waist in the YZ plane
zix : distance from the vertex of the second surface of the lens to the waist of the transmitted beam in the XZ plane
ziy : distance from the vertex of the second surface of the lens to the waist of the transmitted beam in the YZ plane
