Beam delivery methods for highly efficient USP-laser micro structuring of large cylindrical surfaces for printing and embossing

摘要

Despite of today's availability of high power USP lasers up to several hundred Watts, it is still a challenge to structure large surface areas as required on printing and embossing rollers within an acceptable processing time for industrial production. This paper shows and compares the results of two different approaches, the parallel treatment of the workpiece with multiple beam arrangements (each beam individually modulated at repetition rates of up to 2 MHz) and a second approach based on high pulse repetition rates from 6 MHz to 16 MHz combined with fast beam scanning techniques with a polygon scanner up to 100 m/s.