THORLABS WFS20-14AR, Operation Manual

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Wavefront Sensor
5.2.2 Tool Bar
The most common menu functions can be quickly accessed via the tool bar:
Save Measurement Data
Print Window
Setup Wavefront Sensor
Start Measurement
Stop Measurement
Calibrate with Planar Wavefront
Calibrate with Spherical Wavefront
Open the WFS Software online help
5.2.3 Numerical Measurement Results
Numerical measurement results are displayed on the left side of the of the main panel .
Note
These data are valid when no error occurs during image capture and the subsequent data ana-
lysis. To ensure no errors occurred, check the error messages, such as the one shown below,
displayed in the
status bar at the bottom of the GUI.
Note
If ' No instrument errors ' does not appear in the status window you cannot rely on the meas-
urement results! Please refer to Measurement Warnings and Errors for a listing of possible
errors.
Beam Data
Calculated from the centroid and the second moment of the entire camera image, the beam
data include the beam center coordinates
Ctr x and Ctr y and the beam diameter Dia x and
Dia y in X and Y direction, displayed in mm. In the case of a Gaussian beam shape, the second
moment coincides with the beam width at the standard 1/e
2
clip level.
Please take into account that these data cannot give an exact measure of the beam because
the lenslet array in front of the camera and wavefront distortions change the intensity distribu-
tion between the real beam and the camera image. Furthermore, high ambient light levels and
an improper 'Black Level' camera setting (see
Camera Settings ) may distort the beam data
results.
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