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Glass processing with pulsed CO2 laser radiation

: Weingarten, C.; Uluz, E.; Schmickler, A.; Braun, K.; Willenborg, E.; Temmler, A.; Heidrich, S.


Applied optics 56 (2017), No.4, pp.777-783
ISSN: 0003-6935
ISSN: 1539-4522
ISSN: 1559-128X
Journal Article
Fraunhofer ILT ()

Recent results of processing fused silica using a high-power 𝑄-switched CO2 laser source with a maximum output power of 200 W are presented. Compared to the processing with continuous wave laser radiation, the main advantage of pulsed laser radiation is the influence of the light–matter interaction with high laser peak power at small average laser power. An application for the approach presented in this paper is the flexible manufacturing and form correction of optics. This laser-based process is nearly independent of the surface geometry and can even be enhanced by laser polishing and expanded to other glass materials. Hence, the high-power 𝑄-switched CO2 laser source is used to ablate glass material with an ablation rate up to 2.35  mm3/s and also for ablating glass material locally in a vertical dimension down to 3 nm.