domain_x 20[um] ""
domain_y 20[um] ""
lam0 1550[nm] wavelength
f0 c_const/lam0 frequency
slit_width lam0/4 "slit width"
sep 5[um] seperation
screen 1[um] ""
source_x -9.5[um] ""
source_box 1[um] ""
