THORLABS M2MS, Operating Manual

Page: 77 / 167

BP209 Series 7 Operation Instructions
Rev: 8.1, 14-Feb-2022 © 2022 Thorlabs Page 75
Preparation
·
Set Gain Mode to " Automatic ".
·
Set X and Y Slit Bandwidth to " 1000 kHz ".
·
Set Base Line Mode to " Manual ".
· Set Photodiode Bias to " On " - this shortens the
rise/fall time of the photo diode.
· Set Aperture Width to " 0.9 mm " - the software
uses only an area of Ø 0.9 mm in the sensor center
for calculation.
·
Set Active Slit Pair to " 25 µm ".
·
Set Scanning Mode (for alignment) to " Slit ".
· Set Scan Rate to " 2 Hz ".
· Enable Scan Rate Correction.
Enable X and Y profiles.
Disable Gaussian and Bessel fits and zoom in the profiles. A proper alignment is reflected in a
maximum amplitude and a flat top of the profile. The flat top is a result of the small beam size