speed 6.17e3[m/s] "Acoustic speed in solid"
wl 0.5[µm] "Acoustic wavelength"
freq_disp speed/wl "Acoustic frequency"
na 1 "Refractive index, air"
N 1.445 "Refractive index, SiO2"
B1 0.65e-12[m^2/N] "First stress optical coefficient"
B2 4.2e-12[m^2/N] "Second stress optical coefficient"
lam0 441[nm] "Vacuum wavelength"
f0 c_const/lam0 "Optical frequency"
alpha 0 "Angle of incidence"
a 0.5[um] Width
b 3[um] Height