Fabrication of aspheric cylindrical microlenses with the diamond turning technology

Jens Biesenbach; Peter Loosen; Hans-Georg Treusch; Volker K. Krause; Arnd Koesters; Stefan Zamel; Wolfgang Hilgers

doi:10.1117/12.187997

30 September 1994 Fabrication of aspheric cylindrical microlenses with the diamond turning technology

Jens Biesenbach, Peter Loosen, Hans-Georg Treusch, Volker K. Krause, Arnd Koesters, Stefan Zamel, Wolfgang Hilgers

Proceedings Volume 2263, Current Developments in Optical Design and Optical Engineering IV; (1994) https://doi.org/10.1117/12.187997
Event: SPIE's 1994 International Symposium on Optics, Imaging, and Instrumentation, 1994, San Diego, CA, United States

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.

Citation Download Citation

Jens Biesenbach, Peter Loosen, Hans-Georg Treusch, Volker K. Krause, Arnd Koesters, Stefan Zamel, and Wolfgang Hilgers "Fabrication of aspheric cylindrical microlenses with the diamond turning technology", Proc. SPIE 2263, Current Developments in Optical Design and Optical Engineering IV, (30 September 1994); https://doi.org/10.1117/12.187997

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