Divergence Calculator

The beam divergence describes the widening of the beam over the distance. It is defined in milli-radiant (mrad), which usually describes a part of the circumcircle.  Generally spoken, it is best to have a divergence as small as possible.
The beam divergence is in direct relation to the beam size at aperture: By increasing the beam size at the aperture it is possible to reduce the divergence - and vice versa. This is possible to a certain extent, depending on the technology.
To see the importance of the beam divergence, please make some example calculations with our divergence calculator - you can clearly see the importance if the distance is increased:
Please fill in all values, at least for Laser 1



Distance [m]:


Laser 1:
Laser 2:
Power [mW]:
Power [mW]:
Divergence [mrad]:
Divergence [mrad]:
Diameter at aperture [mm]:
Diameter at aperture [mm]:
Thousands separator: ,
Decimal separator: .

Value definition: Laser 1: Laser 2:
Beam diametre after m: mm 2 mm 2
Area of laser point after m: mm mm
Laser intensity after m: mW/mm 2 mW/mm 2