Abstract
Width of kerf depends on spot diameter of laser beam, power density and cutting speed. Especially the strongest relation exists between kerf width and spot diameter. Power density comes from spot diameter is considered as most important factor in laser materials processing. In fact, Cutting speed of processing is increasing when power density is high. In order to focus with conventional optical system in industrial high power laser, single lens is used and beam also has high order mode factor. Keeping the certain distance of focal length, convergent limit of laser spot is obtained by created new optical system that reduced the aberration and smallest diffraction limit. Using this optical system, fundamental material processing was done to confirm optimum beam spot for cutting application.
