© 2011 Thorlabs
121Operating the Beam Profiler
The panels of the Calculation To Actual Z Position and Results are described in
the M² Measurement section.
3.5.7.2
Divergence Measurement Settings
For a successful and reliable measurement it is essential to adapt the settings of the
software.
Click on to enter the Divergence Measurement Settings.
Beam Width
The Beam Width can be selected from the two already known methods.
The calculation of the 4 Diameter follows the ISO 11146-1:2005 standard.
The Approximated Ellipse beam width is based on the 13.5% clip level. At the
beginning of a measurement a reference angle is determined by averaging over 10
frames. This angle is then used to evaluate all following frames and ellipses.
Measurement Parameters
Timeout is the max. waiting time for a valid camera image. This is to allow the
Autoexposure function to obtain a valid camera image
Wavelength is not relevant for divergence measurement.
104
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