35,0(6
Cube L1
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Revision 03 EN - 03/2021
12.2.2 Maximum permissible power density
To avoid damage to the optics, the maximum permissible power density of 250 kW/cm²
at the optics must not be exceeded.
The power density in kW/cm² is calculated according to the formula:
Formula 1: Calculation of the power density
To determine the maximum laser power, the result is weighted with a safety factor of 2.
The safety factor compensates the ratio of maximum to average power density.
Formula 2: Calculation of the permissible laser power depending on the beam diameter
The minimum permissible beam diameter in cm depending on the permissible power
density and laser power is calculated according to the formula:
Formula 3: Calculation of the minimum permissible beam diameter depending on the permissible
power density and the laser power
Example: With the maximum permissible power density of 250 kW/cm² at the optics
and a laser power of 4 kW, the minimum permissible beam diameter is calculated as
follows:
Fig. 12.3: Example calculation
