THORLABS WFS20-14AR, Operation Manual

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© 2007 - 2018 Thorlabs
8 Appendix
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pupil area. Alternatively, the pupil data can be set by the operator.
The image is scanned for detectable spots that are generated by the microlenses and their pos-
itions are compared to reference positions. The user can select an internal or an user reference
table of spot positions.
Spot deviations are calculated and afterwards integrated in order to get a wavefront array which
is displayed in a 3D diagram. All valid spot deviations within the defined pupil region and the
desired number of Zernike orders / modes are input data to the Zernike fit that is used to fit the
measured wavefront by using well-known Zernike functions.
Output data are Zernike coefficients that are displayed numerically as well as in a bar graph
panel.
The wavefront reconstruction is performed using all or a user-selected subset of the Zernike
modes.
The difference between measured and fitted wavefront data is available as well.
8.8 Troubleshooting
Software: Device Driver not found
When connecting the WFS30 or WFS40 to the PC, Windows may show an erroneous error-
message:
"The device driver software was not installed correctly"
In most cases, this error message can be ignored and you can proceed to use the WFS. In
case you can not access the WFS through the software, try de- and reinstalling the software. If
this problem cann ot be solved, please take screen shots of the error message and contact
Thorlabs . We will be happy to help you.
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