Laser Lenses, Optics, and Focus - LaserGods
The beam diameter at the far end is dependent on the length of the beam but, in the case of the typical laser engraver, is about 0.24″. The beam is bounced through the mirrors to the head that houses the focus lens. 2. MIRRORS. The steering mirrors direct the laser beam to and allow the movement of the head and gantry transport system.