© 2011 Thorlabs
57Operating the Beam Profiler
By default, Fast Mode is selected in order to enable a maximum frame rate. For low-
noise and highly accurate measurement results it is required to switch to Precision
Mode.
Tab Corrections
Power Correction
This Power Correction is provided to align the total beam power measured by the
Beam Profiler to the power level measured by a reference power meter. After this
calibration the Beam Profiler can be used as a power meter which is reading correct
values.
Click 'Start' to perform this power correction.
See chapter User Power Calibration for detailed instructions.
Hot Pixel Correction
Hot pixels appear as an unwanted property of CCD sensors and are due to different
charge leakage rates between individual pixels. Hot pixels appear as points of high
intensity particularly at long exposure time and their intensity depends on
temperature as well.
See chapter Hot Pixel Correction for detailed instructions
Ambient Light Correction
It is highly recommended to shield ambient light from entering the entrance aperture
best possible because it cannot be distinguished from beam power. Accordingly, an
offset level will add up to the measured beam profile which leads to inaccurate beam
parameters. Therefore, this correction of the remaining ambient light level is
provided and should be carried out in case of measurable ambient light level (far-off
wings of the X Y profiles do not go down to zero intensity level).
Click 'Start' to perform this ambient light correction.
See chapter Ambient Light Correction for detailed instructions.
Camera's Dark Level
It was not necessary to provide means for proper dark or black level adjustment
because the camera itself is equipped with an automatic black level compensation
which works perfectly and ensures that zero beam intensity is measured without
parasitic offsets yielding to zero measured intensity. Therefore a manual or
automated black level adjustment is dispensable.
Since an increased sensor's dark level would have the same effect like uniformly
distributed ambient light, the provided ambient light correction (see above) will also
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