NA

pygrin.pygrin.NA(n_0, pitch, length, diameter)[source]

Numerical aperture of a grin lens in air.

Parameters:

  • n_0 – index of refraction at center of grin lens [unitless]

  • pitch – pitch or period of the lens [unitless]

  • length – axial length of the lens [mm]

  • diameter – diameter of the lens [mm]

Returns:

float – the numerical aperture of the grin lens in air [unitless]