Output

The laser spot at ~3 m from the laserhead. Obviously, this is a long way from being a Gaussian profile, but it is still evident that the divergence is quite low for a transverse electrode nitrogen laser. Ignoring this, we're looking at about 1 cm per 3 m. Again, ignoring the fact that this is not a Gaussian profile, can anyone offer the formula for calculating the divergence of a laserbeam (in milliradians) based upon the spot size at a given distance from the laserhead?

Done