THORLABS WFS Series, Operation Manual, Page: 30 / 157

© 2007-2012 Thorlabs GmbH
27 Description
It can be easily shown that this is caused by an incoming wavefront with the same
average angle compared to the reference wavefront.
When W(x,y) describes the shape of the wavefront so its partial derivation relative to
x and y are determined by the spot shift x and y, respectively as well as by the
distance between microlens end detector which is usually the focal length of the
microlens f
ML
.
Spot deviations x and y are determined by calculating the centroid coordinates of
all detectable spots and subtracting the corresponding reference coordinates
afterwards. These spot deviations are integrated within a 2-dimensional integration
process that gives the wavefront W(x,y).