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Proceedings Paper

Fabrication of aspheric cylindrical microlenses with the diamond turning technology
Author(s): Jens Biesenbach; Peter Loosen; Hans-Georg Treusch; Volker K. Krause; Arnd Koesters; Stefan Zamel; Wolfgang Hilgers
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Paper Abstract

This paper describes an application of the diamond turning technology for the manufacturing of cylindrical micro lenses. A lens doublet consisting of an aspherical PMMA lens mounted on a sapphire plate was designed. Various surface curvatures are transferable to a crooked stripe of optical material like polymethylmethacrylat. A diamond tool cuts the circular ring at its outer periphery. The approximately 80 cm long, circular lens stripe relaxes after taking off from the chuck to the original straight condition. Microlenses of any length are gotten by separating the long lens stripe to individual lenses. For a quality inspection the surface was examined by a laser interferometer measurement and the collimation performance of the doublet was tested. The measured surface roughness is better than 12 nm RMS. To apply a 10 mm diode bar a lens with 12 X 1,5 mm2 entry aperture was used in the collimating tests. Experimental results show collimating rates for high performance diode laser applications of 70% in a divergence angle of about 4 mrad.

Paper Details

Date Published: 30 September 1994
PDF: 10 pages
Proc. SPIE 2263, Current Developments in Optical Design and Optical Engineering IV, (30 September 1994); doi: 10.1117/12.187997
Show Author Affiliations
Jens Biesenbach, Fraunhofer Institute for Laser Technology (Germany)
Peter Loosen, Fraunhofer Institute for Laser Technology (Germany)
Hans-Georg Treusch, Fraunhofer Institute for Laser Technology (Germany)
Volker K. Krause, Fraunhofer Institute for Laser Technology (Germany)
Arnd Koesters, Fraunhofer Institute for Laser Technology (Germany)
Stefan Zamel, Fraunhofer Institute for Production Technology (Germany)
Wolfgang Hilgers, Fraunhofer Institute for Production Technology (Germany)


Published in SPIE Proceedings Vol. 2263:
Current Developments in Optical Design and Optical Engineering IV
Robert E. Fischer; Warren J. Smith, Editor(s)

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