CO2 Laser-Scanning SYSTEM Using a Telecentric Relay SYSTEM
Original Publication Date: 1987-May-01
Included in the Prior Art Database: 2005-Feb-01
A CO2 laser beam is used in a two-dimensional scanning system for processing continuous-flow roll materials. A two-axis scanning system, incorporating a telecentric relay system, compensates for material flow. The telecentric relay system reduces the wavefront distortion and bowed scan inherent in two-axis scanning. The system also features an f/27 flat field scanning lens, an acousto-optic shutter and a circularly polarized beam for uniform laser cut profile. The CO2 laser beam A is compressed by a reversed Galilean beam expander B, preventing truncation of the beam by the following components. The beam A is split by a 45-degree beamsplitter C and delivered to two identical scanning systems. Each scanning system produces a 305 mm scan, resulting in a total scan of 610 mm.