THORLABS WFS20-14AR, Operation Manual

Page: 37 / 153

© 2007 - 2018 Thorlabs
5 Operating Instruction
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MLA / Wavefront Tab
Microlens Array Selection
The mounted holder with a Microlens Array (MLA), installed on a
Thorlabs Wavefront Sensor can be exchanged,, see
Parts List sec-
tion. Each MLA is factory calibrated with the individual Wavefront
Sensor. The calibration data are saved to the WFS internal non-volatile
memory. In order to supply the correct calibration data to the WFS soft-
ware you need to select the physically installed MLA from the pull down
list.
Selecting a different MLA than was recently used opens an alert message stating that the phys-
ically installed WFS MLA must match the software selection:
Attention
Make sure that the MLA selected in the software is the same as the MLA physically installed in
your Wavefront Sensor. Otherwise, the software will use the wrong calibration data, which will
result in incorrect measurement data.
Wavefront Reference
As a part of Thorlabs' factory calibration of the Wavefront Sensors, the centroid positions of all
lenslet spots on the sensor surface are accurately determined for an incident planar wavefront.
The Internal Reference calibration data file contains these centroid positions. To use the this
factory-calibrated internal reference file for the analysis of the measured spot field centroids,
select the
Internal Reference option as shown below.
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