THORLABS M2MS, Operating Manual

Page: 65 / 167

BP209 Series 7 Operation Instructions
Rev: 8.1, 14-Feb-2022 © 2022 Thorlabs Page 63
7 Operation Instructions
7.1 Measurement with the Beam Profiler
General Guidelines for Operating the BP209 Series Slit Scanning Beam Profiler
To achieve correct and reliable measurement results, it is recommended that these basic
guidelines are followed.
1. Provide stable mounting of the Beam Profiler using appropriate threads on its mounting
plate .
2. In the Beam Software:
a. Enter the correct operating wavelength .
b. Perform a Power Correction
3. Be sure to operate the instrument within its specified Power Range .
4. Align the beam to be measured so that it is perpendicular to the front face of the Beam Pro-
filer.
5. Minimize ambient light entering the Beam Profiler aperture. .
Attention
Do not stick anything into the Beam Profiler aperture ! There is no glass or other protect-
ive barrier to protect the thin slit foils, the bearings of the motor, and/or the rotating
drum.
Prevent dust or other contamination from entering the aperture!
Keep beam power below the allowed limit to avoid damage to the instrument!
Software Performance Optimization
As soon as a BP209 Series device is selected within the "Device Selection" panel, the mea-
surement starts in the continuous mode. It may be advantageous to stop the continuous mea-
surement for a detailed analysis of a beam profile captured with the last image. Also, user inter-
actions with the GUI will work more fluently when the continuous flow of image data is stopped.
Measurement speed of the Beam Profiler depends on various device settings like the scan rate
(rotation speed of the scanning drum), target resolution, gain and bandwidth of the amplifier.
Also the number of open child windows used to visualize the measured results and the number
of activated numerical parameters to be calculated may reduce the available display update
rate, depending on the performance of your PC.
Note
For accurate measurement results (power values, M² results) the correct wavelength must be
entered. Thorlabs Beam Profiler instruments are not calibrated for power with respect to the
wavelength. The power calculation is based on a typical responsivity curve of the used sensor
and manually entered wavelength (see
Beam Settings / Optical Setup ).
7.1.1 Operating the Instrument
Be sure that the Beam Profiler is connected to the PC and the driver is installed properly as de-
scribed in the chapter Connection to the PC.
At the initial program start, the GUI opens and displays the Beam Settings panel, the Cal-
culation Results , 2 D Reconstruction and 3D Profile . Child windows can be opened
and closed via the entries in the menu "Window" or via the symbols in the toolbar of the main
window. The activated windows can be sized and arranged as desired.
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