Gentec-EO Beamage-M2 - Manual (Page 14)

Beamage-M 2 User Manual Revision 2.0 14
2- Fix a Beamage-3.0 camera on the back of the Beamage-M2 module via the C-mount adaptor. Once the
adaptor is screwed upon the camera, insert it in the Beamage-M2 module and use the small setscrew
located on the side of the module to fix the camera in place.
3- Determine how much attenuation you need on the module to avoid destruction and saturation of the
CMOS sensor. Please note that the Fabry-Perot reflective glasses offer an OD4 built-in attenuation.
Optional ND4, ND0.5 to ND5.0 attenuators are also offered. If a greater attenuation is needed to avoid
overheating of the optics, additional partially reflective glasses can be C-mounted onto the aperture of
the Beamage-M2 module.
4- Place a converging lens adapted for your laser in front of the Beamage-M2 module. The lens must be
chosen so that the beam has a Rayleigh length between 50 μm and 6 mm after passing through the lens.
The adjustable distance between the Fabry-Perot etalons allows the measurement of any system using a
lens with focal length equal to or higher than 110 mm. Ideally, the Bemage-M2 module should be
positioned such that the Beamage-3.0’s CMOS sensor is located slightly after the focal length of the lens.
5- Fix the lens in front of the laser. The lens must be at a distance greater than three times the Rayleigh
length from the laser to be in the linear portion of the propagation. If the lens is not positioned
accurately, it will not be possible to have the minimum diameter halfway through the series of spots
displayed in the software.
6- Make sure that the laser, the lens and the Beamage-M2 module are correctly aligned. The laser should
be aimed at the center of the lens and the aperture of the Beamage-M2 module.
Note: If you want to simultaneously monitor your laser system, you can place a beam splitter in the laser path in
order to have a pick off of the laser beam.
3.1.2. Final Adjustments
This section will guide you through the final adjustments on your setup. It is applicable to all kinds of lasers.
1- Connect your Beamage-3.0 camera to your computer, run the PC-Beamage-3.0 application, select your
camera and click Start Capture.
2- If your setup is correctly aligned, you should see some spots already in the software display. The camera
has a preliminary factory adjustment. If not, slightly move the optical components until you see spots.
3- For internal adjustments, use the three screws that are on the side of the module. Here are their
functions:
a. X-ADJ: mirror orientation to adjust the distance between the spots
b. Y-ADJ: mirror orientation to adjust the orientation of the spots (rotation around the first spot)
c. Z-ADJ: adjusts the distance between the Fabry-Perot etalons