If the beacon beam that senses the turbulence has a wavelength
different from that of the laser beam that is sent out, then the
two beams will follow different paths through the atmosphere
because of the dispersive properties of the atmosphere. The
analysis given here parallels that given by Belsher and
Fried.[#1##1###]
...
The change of refractive index with wavelength has been given by
Allen[#16##1###] as