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Suche nach „[Fütterer] [Gerald]“ hat 57 Publikationen gefunden
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    NachhaltigAngewandte Naturwissenschaften und WirtschaftsingenieurwesenIPH Teisnach

    Beitrag (Sammelband oder Tagungsband)

    Alexander Haberl, H. Harsch, Gerald Fütterer, Johannes Liebl, C. Pruß, Rolf Rascher, W. Osten

    Model based error separation of power spectral density artefacts in wavefront measurement

    Proceedings of SPIE 10749 (SPIE Optical Engineering + Applications Conference on Interferometry XIX [August 19-23, 2018; San Diego, CA, USA])

    2018

    DOI: 10.1117/12.2321106

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    Beitrag (Sammelband oder Tagungsband)

    Gerald Fütterer, Johannes Liebl, Alexander Haberl

    Contribution of the phase transfer function of extended measurement cavities to mid spatial frequencies and the overall error budget

    Proceedings of SPIE 10829 (Fifth European Seminar on Precision Optics Manufacturing [April 10-11, 2018; Teisnach])

    2018

    ISBN: 978-1-5106-2270-8

    DOI: 10.1117/12.2318711

    Abstract anzeigen

    A challenge of coaxial - measurement cavity based - interferometer is to realize an interference contrast in the vicinity of one and to realize a complete elimination of the parasitic reflections. Another challenge, which also exists in non-coaxial setups, is the phase transfer function of extended measurement cavities. Ideally, the surface under test (SUT) and the reference surface (REF) are both exactly imaged onto the detector plane. In practice, SUT and REF have to be placed within the depth of field (DOF), which refers to the object space. The term depth of focus refers to the image space. To avoid confusion, the depth of field might be referred to as DOOF (depth of object field) and the depth of focus might be referred to as DOIF (depth of image field). However, in many measurement situations, the REF is not placed within the DOOF, which is the small z-range, which is imaged onto the detector plane. Furthermore, the phase transfer function (PTF) of the REF and the image distortion of the REF are both dependent on the focal plane used to image the SUT onto the detector plane. Effects as phase deformation, image distortion and image blurring have to be taken into account when using extended measurement cavities. This can be done by using a look up table (LUT), which contains simulated and/or calibrated data. Thus, the related system error can be subtracted. A remaining challenge is an unknown object under test (OUT), which is measured by using a double path arrangement. The measured wave front depends on the two surfaces of the OUT and the position of the return mirror. For simplicity, a homogeneous substrate and a perfect return mirror might be presumed. The simulation of waves propagating within extended measurement cavities, as well as measurement results, will be discussed. In addition, the influence on the power spectral density (PSD) will be described. This is important for high end correction techniques as e.g. magneto rheological figuring (MRF) and ion beam figuring (IBF).

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    Vortrag

    Gerald Fütterer

    Etalon effect suppression in optical measurements by using complex coherence optimization

    Posterpräsentation

    5. Tag der Forschung, Deggendorf

    2018

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    Vortrag

    Gerald Fütterer, Johannes Liebl, Alexander Haberl

    Contribution of the phase transfer function of extended measurement cavities to mid spatial frequencies and the overall error budget

    Fifth European Seminar on Precision Optics Manufacturing, Teisnach

    2017

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    Beitrag (Sammelband oder Tagungsband)

    Gerald Fütterer

    Advantages of on-axis PBS based Fizeau interferometers

    DGaO Proceedings zur 118. Jahrestagung in Dresden (06.-10.06.2017)

    2017

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    Beitrag (Sammelband oder Tagungsband)

    Gerald Fütterer

    Fast Fizeau interferometer with polarization selective reference and reduced measurement uncertainty for production integrated measurement

    Forschungsbericht 2016/2017 der Technischen Hochschule Deggendorf

    2017

    Angewandte Naturwissenschaften und Wirtschaftsingenieurwesen

    Vortrag

    Gerald Fütterer

    Optical surface measurement technologies

    Invited Talk

    3rd International Summer School: Trends in energy and particle beam ultra-precision optical surface engineering, Leipzig

    2017

    Angewandte Naturwissenschaften und Wirtschaftsingenieurwesen

    Vortrag

    Gerald Fütterer

    Advantages of on-axis PBS based Fizeau interferometers

    118. Jahrestagung der Deutschen Gesellschaft für angewandte Optik (DGaO), Dresden

    2017

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    Vortrag

    Gerald Fütterer

    Polarization-Fizeau interferometer enabling phase measurement with reduced uncertainty

    SPIE Precision Optics Manufacturing, Session - Measurement in Production, Teisnach

    2017

    DigitalAngewandte Naturwissenschaften und Wirtschaftsingenieurwesen

    Patent

    Gerald Fütterer

    A Display for Two-Dimensional and/or Three-Dimensional Images

    2017

    Angewandte Naturwissenschaften und Wirtschaftsingenieurwesen

    Vortrag

    Gerald Fütterer

    Tailored complex degree of mutual coherence for plane-of-interest interferometry with reduced measurement uncertainty

    SPIE Optifab, Rochester, NY, USA

    2017

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    Beitrag (Sammelband oder Tagungsband)

    Gerald Fütterer

    Tailored complex degree of mutual coherence for plane-of-interest interferometry with reduced measurement uncertainty

    Proceedings of SPIE 10448 (SPIE Optifab [October 16-19, 2017; Rochester, NY, USA])

    2017

    DOI: 10.1117/12.2279834

    Abstract anzeigen

    A problem of interferometers is the elimination of parasitic reflections. Parasitic reflections and modulated intensity signals, which are not related to the reference surface (REF) or the surface under test (SUT) in a direct way, can increase the measurement uncertainty significantly. In some situations standard methods might be used in order to eliminate reflections from the backside of the optical element under test. For instance, match the test object to an absorber, while taking the complex refractive index into account, can cancel out back reflections completely. This causes additional setup time and chemical contamination. In some situations an angular offset might be combined with an aperture stop. This reduces spatial resolution and it does not work if the disturbing wave field propagates in the same direction as the wave field, which propagates from the SUT. However, a stack of surfaces is a problem. An increased spectral bandwidth might be used in order to obtain a separation of the plane-of-interest from other planes. Depending on the interferometer used, this might require an optical path difference of zero or it might cause a reduction of the visibility to V < 0.5. Contrary to these methods, a tailored complex degree of mutual coherence can be used. High visibility is obtained for a single plane-of-interest. Wave fields of interest are shifted against each other. The reduction of the measurement uncertainty, as well as the embodiment of a modified interferometer, will be discussed.

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    Beitrag (Sammelband oder Tagungsband)

    Gerald Fütterer

    Polarization-Fizeau interferometer enabling phase measurement with reduced uncertainty

    Proceedings of SPIE 10326 (Fourth European Seminar on Precision Optics Manufacturing, 1032601 [April 4th-5th 2017, Teisnach])

    2017

    DOI: 10.1117/12.2272001

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    Zeitschriftenartikel

    Gerald Fütterer

    Enabling Holographic 3D Displays with Bragg Diffraction Based Volume Gratings and First Approaches to the Reduction of Diffractive Cross Talk

    Bavarian Journal of Applied Sciences, no. 2, pp. 130-145

    2016

    DOI: 10.25929/276j-2q41

    Abstract anzeigen

    Photonics products often require enhanced optical functionality, which cannot be provided by state of the art optics. This is the case when high-end optical systems as for example holographic 3D displays are developed. Implementation of Bragg diffraction based volume gratings enables small form factor and high definition (HD) natural viewing experience of 3D objects. This is important for modeling 3D data, prototyping, CAD-CAM, computer-integrated manufacturing (CIM), global 3D teleconferencing and mobile infotainment. For example, holographic 3D displays, which are based on space bandwidth limited wave segment reconstruction, profit from the specific characteristics of thick hologram gratings, which can be referred to as Bragg diffraction based volume gratings. It is explained how to adapt angular, spectral and polarization selectivity in order to provide specific optical functionality, which is mandatory in order to realize HD holographic 3D displays. A short introduction to backlight units (BLU), complex valued spatial light modulators (C-SLM) and combined field lenses (cFL) of holographic 3D displays is given. The description of Bragg diffraction based volume gratings is based on the coupled wave theory (CWT). The usage of the 2nd on-Bragg maximum modulation is described. The advantage of the 2nd Bragg diffraction order is explained. Polarization beam splitter (PBS) geometries are described. Specific layouts of holographic 3D displays are explained. BLU and cFL are evaluated. It is shown how the suppression of diffractive crosstalk can be obtained. Oftmals benötigen neue Produkte der Photonik eine erweiterte optische Funktionalität, die nicht von optischen Standard-Komponenten bereitgestellt werden kann. Dies ist auch für die Entwicklung von holographischen 3D-Displays der Fall. Hierbei ermöglicht die Implementierung von Volumengittern, die auf der Bragg-Beugung basieren, eine kompakte Bauweise und eine natürliche Wahrnehmung von 3D-Objekten in HD-Auflösung. Dies ist für die Modellierung von 3D-Daten, die Erstellung von Prototypen, CAD-CAM, Computer integrierte Fertigung (CIM), weltweit arbeitende Telekonferenz-Systeme und mobiles Infotainment von Bedeutung. Holographische 3D-Displays, die auf einer, in der Bandbreite limitierten Rekonstruktion von Wellenfrontsegmenten beruhen, profitieren von der spezifischen Charakteristik dicker holographischer Gitter, welche als Bragg-Beugung basierte Volumengitter bezeichnet werden können. Es wird beschrieben, wie die Winkel-, Wellenlängen- und Polarisationsselektivität ausgelegt werden kann, um spezifische optische Funktionalitäten bereitzustellen. Diese sind unter anderem notwendig, um HD-fähige holographische 3D-Displays zu realisieren. Es wird eine kurze Einführung zu Hintergrundbeleuchtungseinheiten, komplexwertigen räumlichen Modulatoren und kombinierten Feldlinsen von holographischen 3D-Displays gegeben. Die Beschreibung Bragg-Beugung basierter Volumengitter erfolgt unter Nutzung der CWT (coupled wave theory). Es wird dargelegt, wie das 2-te Maximum der on-Bragg Modulation genutzt werden kann. Der Vorzug der 2-ten Bragg-Beugungsordnung wird erklärt. Polarisations-Strahlteiler-Geometrien werden beschrieben. Spezifische Anordnungen von holographischen 3D-Displays werden erklärt. Beleuchtungseinheiten und kombinierte Feldlinsen werden untersucht. Es wird beschrieben, wie die Unterdrückung diffraktiven Übersprechens erreicht werden kann.

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    Patent

    Gerald Fütterer

    Display Device, in Particular a Head-Mounted Display, Based on Temporal and Spatial Multiplexing of Hologram Tiles

    2016

    DigitalAngewandte Naturwissenschaften und Wirtschaftsingenieurwesen

    Patent

    Gerald Fütterer

    Beam Divergence and Various Collimators for Holgraphic or Stereoscopic Displays

    2016