Using a dynamic PWM to turn the laser down measuring the heat increase as the dot gets to its smallest point. On a fixed focus ( 15-watt DUOS), the ramp test can come in handy. The distance from the lens to the focal point is called the focal distance or working distance.īasically, the focusing of a laser beam is achieved by using a single- or multi-lens laser optic, which is mainly characterized by its focal length and the diameter of the free aperture. … This point when the beam is focused perfectly is called the focal point. Lasers use a beam of light to engrave or etch information directly on the surface of a variety of materials.
