What does divergence mean?
The divergence specifies the expansion
(widening) of a laser beam.
As a unit of measure mrad (abbreviated for
Millirad, known also as milliradians) is used.
If the diameter of a laser beam increases for
example to 1 mm per 1 m beam path, so
the divergence is 1 mrad.
According to quality, assembly and
wavelength of the laser the divergence can
vary.
As a general rule: the smaller the mrad (the
smaller the divergence) the brighter the
laser beam for a long distance.
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