BFL

pygrin.pygrin.BFL(n_0, pitch, length)[source]

Back focal length of a grin lens.

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]

Returns:

float – the back focal length of the grin lens [mm]