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Development of a laser based process chain for manufacturing free form optics

: Heidrich, S.; Richmann, A.; Willenborg, E.

Postprint urn:nbn:de:0011-n-2063286 (7.5 MByte PDF)
MD5 Fingerprint: 0f0b1e6cb78d4bda98a7fd2be46487f3
Erstellt am: 8.8.2014

Graf, T. ; Society of Photo-Optical Instrumentation Engineers -SPIE-, Bellingham/Wash.:
Laser Sources and Applications : Brussels, Belgium, April 2012
Bellingham, WA: SPIE, 2012 (Proceedings of SPIE 8433)
ISBN: 978-0-8194-9125-1
Paper 84330P
Conference "Laser Sources and Applications" <2012, Brussels>
Konferenzbeitrag, Elektronische Publikation
Fraunhofer ILT ()

This paper presents the development of a laser based process chain for manufacturing fused silica optics. Due to disadvantages of conventional methods concerning costs and time when manufacturing optics with nonspherical shape, this process chain focuses on aspherical and free form surface geometries, but it is also capable of producing spherical optics. It consists of three laser based processing steps, which in combination produce the optics. In a first step, fused silica is ablated with laser radiation to produce the geometry of the optics. A subsequent laser polishing step reduces the surface roughness and a third step uses laser micro ablation to remove the last remaining redundant material. Most of the conducted experiments are carried out using CO 2 laser radiation, but it is also possible to ablate material with ultra short pulse laser radiation. Besides describing the experimental setup and the mechanisms of the ablation and polishing step, the paper presents and discusses results achieved to date. Although the process chain is still under development, the single process steps already reach promising results for themselves and moreover, first elements are manufactured using the first two process steps together.