wl 1[um] Wavelength
k 2*pi/wl "Wave number"
w 50[um] "Beam half size"
n_lens 1.5 "Refractive index of lens"
W_lens 15[um] "Lens thickness"
H 200[um] "Domain height"
R 500[um] "Lens radius of curvature"
W_air 1100[um] "Air domain size"
f 0.94[mm] "Focus position"
n_AR sqrt(n_lens) "Refractive index of AR coating"
d_AR wl/4/n_AR "Thickness of AR coating"