61
Revision 00 EN - 01/2021
HP-MSM-HB
35,0(6
If you turn the Beam Find function off and have the measuring measure the beam search plane system be-
fore each caustic measurement, you can save about 20 sec of measuring time per caustic measurement.
Summary: This function should be activated by default and only deactivated by experienced users. Turning
off this function can shorten the time for caustic measurements by about 15 %.
Fill factor
The fill factor is the quotient of the beam diameter and the length of the sides of the measuring window. As
long as the measuring signal is not cut off and there are no noise components in the measuring result and
now errors in the offset determination, the fill factor won’t influence the accuracy at all. But since every real
measuring signal is tainted with noise and since the precision with which the zero level of a measuring signal
can be determined is finite, very small fill factors can lead to a high level of accuracy. Depending on how
substantial the RMS noise is and the errors in the zero level determination of a measuring plane, the optimal
fill factor value to produce the best possible mathematical result will be different.
For TopHat and Gaussian beam shaped laser beams, the fill factor should range between 0.5 and 0.7. If the
beam has diffraction rings, however, and if these are located completely within the measuring window, the
optimal value for the fill factor can be between 0.5 and 0.6.
By default, the value should be set to: “Max 0.7 Min 0.5 Target 0.6”. For extremely deformed beams, the
value may be changed to “Max 0.6 Min 0.4 Target 0.5”.
Font size
The font size for the most important display window can be changed here.
It is set to 10 points at the factory.
Open windows
When the window opening function is activated, some basic windows are opened when the LDS is started. If
you don’t want this to happen, the function can be deactivated.
13.6.7
CCD info (menu
Measurement > CCD Info
)
The most important device data is shown in the menu
Measurement > CCD Info
. Here you can see the
magnification information for the measuring objective and also check which beam path is turned on.
If obvious default values (1:1) are shown instead of the actual magnification, then please check the mounting
of the measurement objective.
Fig. 13.8:
Window
CCD Info
