What is divergence?
Divergence describes the expansion of a laser beam over a long distance. The value is given in mrad (milliradiant), a unit to specify angles.
What is better, a high value or a small value of divergence?
The higher the divergence, the bigger the widening of the laser beam over a long distance. Thus, the laser beam becomes less visible and sharp graphics can hardly be displayed over long distances. This means that the smalles possible divergence makes the best show laser. The laser beams stay thin and crisp even over the longest distances.
Can I calculate how the laser beam behaves after a certain distance?
Thanks to the Laserworld divergence calculator this is no problem. You will find this tool on following page: https://www.laserworld.com/en/laserworld-toolbox/divergence-calculator.html
Just specify the laser power, your desired distance, the divergence of the show laser and the beam diameter after optics. All values can be found in the manual of your laser projector.