Setting up for Measurements
Beam Cube User Guide
4
Setting up for Measurements
4.1
Positioning the Beam Cube and the Laser Under
Test
The Beam Cube is designed to look at converging beams
either at the focal spot or at some point before the focal
spot so the CCD camera should always be at a point before
the focal spot or at the focal spot.
The Beam Cube should
never be placed so far from the source that the focal
spot comes before the camera. This can result in
damage to components inside the Beam Cube when the
laser is run at full power.
In order to facilitate proper setup and positioning of the
Beam Cube, we have provided on the CD included an
Excel program
"Setup Program for YAG FSA and
Beam Cube"
to help you calculate where to place the
Beam Cube. There are two positions given, the position
that will show the focal spot and the position where the
image will be the largest it can be within the size of the
camera CCD.
12
Note 1: The same Excel program works for Beam Cube
except you should change the Height of CCD in smaller
dimension C from 5.4 to 4.7 before calculation
Note 2: A -100mm negative lens has been provided
with the Beam Cube. If the -100mm lens does not
have sufficient power for the beam focus to reach the
CCD, try -50mm. This alternative lens can be ordered if
necessary. Note that the magnification should optimally
be in the range 1.8 – 3 times
