THORLABS WFS150, Operation Manual

Page: 84 / 123

82 WFS150 / WFS150C Manual
© <2007> ... Thorlabs GmbH
RMS Variations
Since the Zernike modes are normalized to unity variance, all Zernike coefficients
of a particular order can be summarized and expressed as total RMS variation of
this Zernike order. The number of Zernike orders defined in
Zernike Fit Setup
panel will determine the number of output appropriate RMS variation results.
Zernike Modes
The coefficients of the Zernike modes which are determined by a least square fit
to the measured wavefont are either displayed in microns or waves. The mode
number is followed by the order and frequency number of the mode in brackets.
Fit Error
The Fit error describes the difference between the measured and the
reconstructed wavefront. A lower value indicates a better fit. Usually, a Zernike fit
using more modes will reduce the fit error.