Please choose here, if you need a blue machine vision laser line, a focus or a collimator. The difference between a Laser Focus Generator and a Laser Collimator is: A Focus Generator produces a focused laser spot in a defined working distance and the spot diameter changes with distance from the Laser Module. A Laser Collimator produces a collimated beam, which only has a low beam divergence and the beam diameter only changes slowly with distance from the Laser Module.