Dr. Juergen Lamprecht Profile

Dr. Juergen Lamprecht

Senior Scientist at OPTOCRAFT GmbH

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Publications (9)

Proceedings Article | 27 September 2012 Paper

Test system for a Shack-Hartmann sensor based telescope alignment demonstrated at the 40cm Wendelstein Telescope

Stephanie Bogner, M. Becker, Frank Grupp, Florian Lang-Bardl, ShaoMing Hu, Matthias Beyerlein, Jürgen Lamprecht, Johannes Pfund, Ulrich Hopp, Ralf Bender, Burkhard Fleck

Proceedings Volume 8444, 844458 (2012) https://doi.org/10.1117/12.925638

KEYWORDS: Telescopes, Mirrors, Sensors, Wavefronts, Wavefront sensors, Space telescopes, Cameras, Observatories, Optical design software, Device simulation

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Proceedings Article | 28 April 2006 Paper

Optical characterization of spherical microlenses: a round robin experiment within the EC Network of Excellence on Micro-Optics (NEMO)

Heidi Ottevaere, Johannes Schwider, Jürgen Lamprecht, Jacek Kacperski, Anna Szpak, Lothar Steinbock, Ken Weible, Hugo Thienpont

Proceedings Volume 6188, 618818 (2006) https://doi.org/10.1117/12.663597

KEYWORDS: Microlens, Source mask optimization, Spherical lenses, Micro optics, Beam splitters, Interferometers, Surface roughness, Microscopes, Microlens array, Optical fibers

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Proceedings Article | 28 April 2006 Paper

Characterization of cylindrical microlenses in transmitted light and with grazing incidence interferometry in reflected light

Jürgen Lamprecht, Norbert Lindlein, Johannes Schwider

Proceedings Volume 6188, 618816 (2006) https://doi.org/10.1117/12.662691

KEYWORDS: Diffractive optical elements, Interferometers, Lenses, Grazing incidence, Diffraction, Wavefronts, Interferometry, Beam splitters, CCD cameras, Spatial frequencies

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High numerical aperture cylindrical micro-lenses are needed in collimating the laser light from laser bars in the near infrared. Diffraction limited performance of such collimation lenses can only be obtained if the surface shape deviates strongly from circular symmetry. Therefore, null tests make the use of diffractive optical elements (DOE) necessary. For performance test at the design wavelength the reference DOE produces an ideal cylinder wave which enables the compensation of the wave front coming from the micro-lens to a plane wave. The use of a DOE-master enables beside the null test geometry also a removal of the anamorphic distortion due to the cylinder geometry. The DOEs having a numerical aperture of 0.8 are produced on an e-beam machine. The measurement of the wave aberrations is done with the help of the phase shifting technique. Alignment aberrations are eliminated by a least square fit of suitable misalignment functionals derived from an analytic approximation. The shape of the micro-lenses is tested in reflected light showing surface defects directly. The cylinder symmetry allows for a grazing incidence test using two DOE with nearly constant spatial frequency. There are no limitations concerning the test of high numerical aperture surfaces since the structure of the diffractive elements are parallel curves to the profile curve. The mean spatial frequency of the DOE defines the effective wavelength. Since we use a diffractive interferometer the effective wavelength is identical to the pitch of the DOE. Usually pitches between 4-10 μm are used resulting in a fringe sensitivity of 2-5 Μm. The test delivers the deviation of the surface from the ideal form. In the case of non-circular symmetry the DOE deviates from the axicon type DOE. In addition to the shape deviations also the radius of curvature at the vertex can be measured. The stage for the cylindrical micro-lens is equipped with a length measuring device using grating references from Renishaw providing a length increment of 0.1μm. With the axicon DOE there are two positions where nearly fluffed out fringes can be observed. Starting from the basic test position the lens can be moved until the vertex of the lens coincides with the focal line of the wave generated by the central part of the DOE. The distance between these two positions gives the radius of curvature for the vertex. Modern manufacturing of micro-lenses comprises also hot embossing in plastics or even into glass. Because of the small dimensions of the lenses and the required accuracy of the surface shape also tests of the impressing mould have to be carried out. The DOE approach enables also the test of the embossing form with the same sensitivity as the final test of the lens. Measuring results for the two test methods will be given.

Proceedings Article | 22 December 2003 Paper

Null test measurement of high-numerical-aperture cylindrical microlenses in transmitted light

Juergen Lamprecht, Norbert Lindlein, Johannes Schwider

Proceedings Volume 5180, (2003) https://doi.org/10.1117/12.505547

KEYWORDS: Diffractive optical elements, Wavefronts, Lenses, Diffraction, Near infrared, Wavefront sensors, Semiconductor lasers, Interferometers, CCD cameras, Etching

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Proceedings Article | 19 June 2002 Paper

Interferometric testing of refractive microcylinder lenses

Johannes Schwider, Juergen Lamprecht

Proceedings Volume 4778, (2002) https://doi.org/10.1117/12.473538

KEYWORDS: Diffractive optical elements, Interferometers, Lenses, Interferometry, Beam shaping, Optical testing, Wavefronts, Grazing incidence, Aspheric lenses, Beam splitters

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Proceedings Article | 13 December 2001 Paper

Microlens arrays fabricated by deep lithography with protons and their characterization

Heidi Ottevaere, Patrik Tuteleers, B Volchaerts, Valerie Baukens, Juergen Lamprecht, Johannes Schwider, Alex Hermanne, Kris Naessens, Irina Veretennicoff, Hugo Thienpont

Proceedings Volume 4455, (2001) https://doi.org/10.1117/12.450451

KEYWORDS: Microlens, Microlens array, Diffusion, Digital Light Processing, Lithography, Monochromatic aberrations, Polymethylmethacrylate, Calibration, Silicon, Polymers

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Proceedings Article | 9 November 2001 Paper

Interferometrical measurement of cylindrical lenses with the help of computer-generated holograms

Norbert Lindlein, Juergen Lamprecht, Klaus Mantel, Johannes Schwider

Proceedings Volume 4440, (2001) https://doi.org/10.1117/12.448032

KEYWORDS: Diffractive optical elements, Interferometry, Cylindrical lenses, Grazing incidence, Diffraction, Interferometers, Wavefronts, Computer generated holography, Lens design, Aspheric lenses

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Proceedings Article | 19 July 1999 Paper

Error analysis for a single-frame phase-shifting speckle interferometer

Jochen Kranz, Andrea Hettwer, Juergen Lamprecht, Johannes Schwider

Proceedings Volume 3749, (1999) https://doi.org/10.1117/12.355066

KEYWORDS: Error analysis, Phase shifts, Camera shutters, CCD cameras, Interferometers, Diffractive optical elements, Beam splitters, Cameras, Phase interferometry, Charge-coupled devices

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Proceedings Article | 29 September 1998 Paper

Fiber optical single-frame speckle interferometer for measuring industrial surfaces

Jochen Kranz, Juergen Lamprecht, Andrea Hettwer, Johannes Schwider

Proceedings Volume 3407, (1998) https://doi.org/10.1117/12.323335

KEYWORDS: Interferometers, Fiber optics, Speckle, CCD cameras, Cameras, Speckle interferometry, Polarizers, Binary data, Beam splitters, Fiber optics tests

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Showing 5 of 9 publications

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