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Diffraction based laser projection

Due to advances in the field of microtechnology very small displays can be manufactured. Such displays can be used as spatial light modulators (SLM). With a pixel size of only a few microns, the SLM diffracts visible light. Using a coherent light source and a phase-only modulating SLM, a very efficient diffraction-based projection unit is realized. This principle uses phase-only modulation, diffraction and interference of coherent light. With regard to image processing, diffraction-based laser projection is one of the most interesting projection techniques of today's research!

In this research project image processing of diffraction based laser projection is analysed. A high resolution liquid crystal on silicon (LCoS) display serves as a dynamic diffraction grating. Coherent laser light is dynamically diffracted and interferes to almost any desired image in the far field. The propagation operator of the light field can be described by a Fourier transform, thus the name Fourier holography.

Our research interests are in efficient hologram computation for real-time applications, analysis of diffraction efficiency and investigation of visible artifacts when changing from one phase hologram to another.

Keywords: computer-generated hologram, diffractive optics, kinoform, real-time holography, diffraction-based projection

Laserprojektion

References:

  • M. Bernau, R. Kays
    Diffraction-Based Laser Projection Using Liquid Crystal Displays,
    14th ITG Conference on Electronic Media Technology (CEMT'11), Dortmund, March 2011, ISBN 978-3-00-033964-6

  • M. Bernau
    Improved Hologram Calculation for Correlated Video Frames,
    IEEE Internat. Conference on Consumer Electronics 2010, Las Vegas, USA, 11.1.-13.1.2010, pp. 507-508, ISBN 978-1-4244-4315-4, 2010

  • M. Bernau
    Efficient Image Processing in Fourier Holography for Moving Images,
    IEEE 6th International Symposium on Image and Signal Processing and Analysis, Salzburg, Österreich, 16.-18. September 2009, pp. 394-399, ISBN 978-953-184-135-1, 2009

  • M. Bernau, D. Lubeley
    Fourierholographische Projektion von Bewegtbildsequenzen mit effizienter Berechnung der Phasenhologramme,
    ITG Fachbericht, Vorträge des 13. Dortmunder Fernsehseminars vom 17. bis 18. März 2009 in Dortmund, ISBN 978-3-00-027300-1, pp. 144-149, 2009.

  • D. Lubeley, M. Bernau
    Fourierholographische Laserprojektion in Echtzeit,
    ITG Fachbericht, Vorträge des 13. Dortmunder Fernsehseminars vom 17. bis 18. März 2009 in Dortmund, ISBN 978-3-00-027300-1, pp. 212-215, 2009.

  • D. Lubeley
    Dynamische Beugungsmuster für die optische Tiefenprofilbestimmung,
    VDI-Fachtagung, Bildverarbeitung 2007, Regensburg, 2007.



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Contact

M.Sc. Christian Brauers