Fig. 9.
From: Beam characterization of a microfading tester: evaluation of several methods
Laser beam profiler measurements: a 2D image of the illumination spot showing energies along x- and y- axes; b 3D view of the illumination spot; c 2D image of the collection spot showing energies along x- and y- axes; d 3D view of the collection spot; e image of the common area of illumination and collection captured with the CMOS camera; f estimated sizes and shapes of illumination spot (yellow) and collection spot (grey)