Improving laser material processing objective lenses towards better utilization of high brilliance light sources

Lutz Reichmann; Hans-Jürgen Feige; Jürgen Finster; Matthias Bening; Jörg Wunderlich; Peter Triebel; Helmut Bernitzki; Uwe Schuhmann

doi:10.1117/12.981341

18 December 2012 Improving laser material processing objective lenses towards better utilization of high brilliance light sources

Lutz Reichmann, Hans-Jürgen Feige, Jürgen Finster, Matthias Bening, Jörg Wunderlich, Peter Triebel, Helmut Bernitzki, Uwe Schuhmann

Author Affiliations +

Proceedings Volume 8550, Optical Systems Design 2012; 85500I (2012) https://doi.org/10.1117/12.981341
Event: SPIE Optical Systems Design, 2012, Barcelona, Spain

Abstract

Today’s high brilliance Laser sources cause huge thermal effects on optical components, affecting process stability. This paper shows the holistic approach to the improvement of objective lenses to minimum thermal effects as focus shift. A new approach to the transient simulation of thermal behavior, starting with FEM Analysis, analytical description of surface deformation and refraction index distribution resulting in transient plot of image quality changes by optics design simulation. Optics material selection and characterization of bulk material, surface and coating by newly developed measurement techniques is shown. The optimum setting of opto-mechanical design, material selection, surface finish and coating allows to produce lenses with focus shift by 0,05times the Rayleigh range @1064nm, 4kW multimode at reasonable price.

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Lutz Reichmann, Hans-Jürgen Feige, Jürgen Finster, Matthias Bening, Jörg Wunderlich, Peter Triebel, Helmut Bernitzki, and Uwe Schuhmann "Improving laser material processing objective lenses towards better utilization of high brilliance light sources", Proc. SPIE 8550, Optical Systems Design 2012, 85500I (18 December 2012); https://doi.org/10.1117/12.981341

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