THORLABS WFS20-14AR, Operation Manual

Page: 66 / 153

© 2007 - 2018 Thorlabs 64
Wavefront Sensor
Wavefront Select Switch
The switch below the graph determines the wavefront type that is displayed:
' Measured ' shows the wavefront which is directly calculated from the measured spot deviations
using a 2-dimensional integration.
' Reconstructed ' displays the wavefront that is reconstructed using the selected set of the de-
termined Zernike coefficients ( Zernike Fit Setup ). The advantages of this display are:
·
Selecting only a few Zernike modes of lower order for reconstruction smooths the wave-
front surface (noise canceling).
·
The lowest order Zernike modes (for instance Z1 piston, Z2 tip and Z3 tilt) are always
present but they are of less interest. Using an appropriate reconstruction (e.g., starting
from Z4) can omit the Z1, Z2 and Z3
Zernike modes in order to see only the higher or-
der modes.
·
If selecting particular Zernike modes, they can be displayed and analyzed separately.
' Difference ' displays the difference between the measured and reconstructed wavefront and is
therefore an indicator of the fit error.
Note
The actual switch setting impacts the calculated wavefront statistics PV, RMS and wRMS (see
Measurement Results ) because the statistic values refer to the selected wavefront (Meas-
ured, Reconstructed or Difference).
Direct rotation, zoom and shifting of the 3D graph
Rotate the graph: Click and hold the left mouse button on the graph, then drag the mouse.
Zoom the graph: Use the mouse wheel.
Shift the graph: Press the Shift key, click and hold the left mouse button while dragging the
mouse.
Double click on the graph area to access the Wavefront Graph Configuration panel:
There are two predefined view adjustments, 'Default 3D view' and 'Default top view'.
38
113
48