Collimator is used to convert the divergent beam into a collimated beam. With the help of single aspheric lens, the lens output beam divergence is 0.02 mrad. And at the same time the system transmission is 2% more than normal collimated lens. To absorb the heat from laser the lens is developed with a cooling system patented. With the software COOLIT and practical test, the system heat-sink efficiency is very high: after 200 hours continuously test the spot diameter and roundness only change 1%. Air Jordan XVIII 18