Dr. Thomas P. Fäcke Profile

Dr. Thomas P. Fäcke

Director at Covestro AG

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Author

Publications (17)

Proceedings Article | 19 February 2018 Presentation + Paper

On the impact of incoherent pre-exposure on vHOE recording in Bayfol HX film for see-through applications

Friedrich-Karl Bruder, Thomas Fäcke, Sven Hansen, Christel Manecke, Christian Rewitz, Thomas Rölle, Enrico Orselli, Brita Wewer

Proceedings Volume 10558, 105580B (2018) https://doi.org/10.1117/12.2288495

KEYWORDS: Holograms, Reflection, Holography, Light emitting diodes, Diffraction, Image quality, Light sources, Diffraction gratings, Modulation

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Proceedings Article | 25 September 2017 Open Access

Photopolymer materials for volume phase holographic optical elements

A. Zanutta, E. Orselli, T. Fäcke, A. Bianco

Proceedings Volume 10562, 105625R (2017) https://doi.org/10.1117/12.2296183

KEYWORDS: Diffraction, Refractive index, Modulation, Diffraction gratings, Spectrographs, Telescopes, Prisms, Astronomical imaging, Optical design, Absorption

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Proceedings Article | 26 June 2017 Paper

Thin combiner optics utilizing volume holographic optical elements (vHOEs) using Bayfol HX photopolymer film

Friedrich-Karl Bruder, Thomas Fäcke, Rainer Hagen, Sven Hansen, Christel Manecke, Enrico Orselli, Christian Rewitz, Thomas Rölle, Günther Walze

Proceedings Volume 10335, 103350D (2017) https://doi.org/10.1117/12.2270158

KEYWORDS: Reflection, Holograms, Modulation, Photopolymerization, Diffraction gratings, Diffraction, Holography, Holographic optical elements, Augmented reality, Head-mounted displays, Visual optics, Information visualization, Holographic materials, Volume holography, Glasses, Heads up displays

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The main function of any augmented reality system is to seamlessly merge the real world perception of a viewer with computer generated images and information. Besides real-time head-tracking and room-scanning capabilities the combiner optics, which optically merge the natural with the artificial visual information, represent a key component for those systems. Various types of combiner optics are known to the industry, all with their specific advantages and disadvantages. Beside the well-established solutions based on refractive optics or surface gratings, volume Holographic Optical Elements (vHOEs) are a very attractive alternative in this field. The unique characteristics of these diffractive grating structures - being lightweight, thin, flat and invisible in Off Bragg conditions - make them perfectly suitable for their use in integrated and compact combiners. For any consumer application it is paramount to build unobtrusive and lightweight augmented reality displays, for which those volume holographic combiners are ideally suited. Due to processing challenges of (historic) holographic recording materials mass production of vHOE holographic combiners was not possible. Therefore vHOE based combiners found use in military applications only by now. The new Bayfol® HX instant developing holographic photopolymer film provides an ideal technology platform to optimize the performance of vHOEs in a wide range of applications. Bayfol® HX provides full color capability and adjustable diffraction efficiency as well as an unprecedented optical clarity when compared to classical holographic recording materials like silver halide emulsions (AgHX) or dichromated gelatin (DCG). Bayfol® HX film is available in industrial scale and quality. Its properties can be tailored for various diffractive performances and integration methods. Bayfol® HX film is easy to process without any need for chemical or thermal development steps, offering simplified contact-copy mass production schemes.

Proceedings Article | 15 May 2017 Paper

Photopolymers for holographic optical elements in astronomy

A. Zanutta, E. Orselli, T. Fäcke, A. Bianco

Proceedings Volume 10233, 1023316 (2017) https://doi.org/10.1117/12.2264975

KEYWORDS: Astronomy, Photopolymers, Holography, Spectrographs, Holographic optical elements, Design for manufacturability, Refractive index, Modulation, Holographic materials, Holography applications, Optical components, Photosensitive materials, Control systems

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Proceedings Article | 15 May 2017 Presentation + Paper

Performance optimization in mass production of volume holographic optical elements (vHOEs) using Bayfol HX photopolymer film

Friedrich-Karl Bruder, Thomas Fäcke, Fabian Grote, Rainer Hagen, Dennis Hönel, Eberhard Koch, Christian Rewitz, Günther Walze, Brita Wewer

Proceedings Volume 10233, 102330G (2017) https://doi.org/10.1117/12.2265022

KEYWORDS: Diffraction gratings, Integrated optics, Eyeglasses, Lenses, Holography, Holographic optical elements, Optics manufacturing, Holographic materials, Volume holography, Glasses, Augmented reality, Seaborgium, Consumer electronics, Heads up displays

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Proceedings Article | 6 April 2017 Presentation + Paper

Mass production of volume holographic optical elements (vHOEs) using Bayfol(R) HX photopolymer film in a roll-to-roll copy process

Friedrich-Karl Bruder, Thomas Fäcke, Fabian Grote, Rainer Hagen, Dennis Hönel, Eberhard Koch, Christian Rewitz, Günther Walze, Brita Wewer

Proceedings Volume 10127, 101270A (2017) https://doi.org/10.1117/12.2250933

KEYWORDS: Holographic optical elements, Heads up displays, Head-mounted displays, Holography, Manufacturing, Optical design, Volume holography, Optics manufacturing, Virtual reality, Consumer electronics, Holograms, Reflection, Diffraction, Glasses, Polarization, Mirrors, Wavefronts, Fourier transforms

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Proceedings Article | 22 July 2016 Paper

Photopolymer based VPHGs: from materials to sky results

A. Zanutta, E. Orselli, T. Fäcke, A. Bianco

Proceedings Volume 9912, 99123B (2016) https://doi.org/10.1117/12.2230893

KEYWORDS: Astronomy, Refractive index, Modulation, Diffraction gratings, Spectrographs, Diffraction, Telescopes, Manufacturing, Prisms, Holographic materials

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Proceedings Article | 7 March 2016 Paper

Precision holographic optical elements in Bayfol HX photopolymer

Friedrich-Karl Bruder, Hyungseok Bang, Thomas Fäcke, Rainer Hagen, Dennis Hönel, Enrico Orselli, Christian Rewitz, Thomas Rölle, Dalibor Vukicevic, Günther Walze

Proceedings Volume 9771, 977103 (2016) https://doi.org/10.1117/12.2209636

KEYWORDS: Spherical lenses, Holography, Holographic optical elements, Refractive index, Volume holography, Diffractive optical elements, Optical components, Optical design software, Precision optics, Optical design, Diffusers, Polymethylmethacrylate, Paraxial approximations, Refraction, Diffraction, Geometrical optics

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Proceedings Article | 23 September 2015 Paper

Diffractive optics with high Bragg selectivity: volume holographic optical elements in Bayfol® HX photopolymer film

Friedrich-Karl Bruder, Thomas Fäcke, Rainer Hagen, Dennis Hönel, Enrico Orselli, Christian Rewitz, Thomas Rölle, Günther Walze

Proceedings Volume 9626, 96260T (2015) https://doi.org/10.1117/12.2191587

KEYWORDS: Diffraction, Modulation, Reflection, Holography, Holograms, Holographic optical elements, Photopolymerization, Diffraction gratings, Optical design, Diffusion

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Proceedings Article | 8 May 2015 Paper

Second harmonics HOE recording in Bayfol HX

Friedrich-Karl Bruder, Thomas Fäcke, Rainer Hagen, Dennis Hönel, Enrico Orselli, Christian Rewitz, Thomas Rölle, Günther Walze, Brita Wewer

Proceedings Volume 9508, 95080G (2015) https://doi.org/10.1117/12.2178269

KEYWORDS: Diffraction, Diffraction gratings, Holograms, Picosecond phenomena, Holographic optical elements, Reflection, Holography, Waveguides, Free space, Refractive index

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Volume Holographic Optical Elements (vHOEs) provide superior optical properties over DOEs (surface gratings) due to high diffraction efficiencies in the -1^st order and their excellent Bragg selectivity. Bayer MaterialScience is offering a variety of customized instant-developing photopolymer films to meet requirements for a specific optics design of a phase hologram. For instance, the photopolymer film thickness is an ideal means to adjust the angular and the spectral selectivity while the index modulation can be adopted with the film thickness to achieve a specific required dynamic range. This is especially helpful for transmission type holograms and in multiplex recordings. The selection of different substrates is helpful to achieve the overall optical properties for a targeted application that we support in B2B-focused developments. To provide further guidance on how to record volume holograms in Bayfol HX, we describe in this paper a new route towards the recording of substrate guided vHOEs by using optimized photopolymer films. Furthermore, we discuss special writing conditions that are suitable to create higher 2^nd harmonic intensities and their useful applications. Due to total internal reflection (TIR) at the photopolymer-air interface in substrate guided vHOEs, hologram recording with those large diffraction angles cannot usually be done with two free-space beams. Edge-lit recording setups are used to circumvent this limitation. However, such setups require bulky recording blocks or liquid bathes and are complex and hard to align. A different approach that we present in this paper is to exploit 2^nd harmonic grating generation in a freespace recording scheme. Those 2^nd harmonic components allow the replay of diffraction angles that are normally only accessible with edge-lit writing configurations. Therefore, this approach significantly simplifies master recordings for vHOEs with edge-lit functionalities, which later can be used in contact copy schemes for mass replication. In this paper, we will discuss and illustrate recording parameters to influence 2^nd harmonic efficiency in optimized photopolymer films and will explain preferred geometries for recording.

Proceedings Article | 11 March 2015 Paper

Diffractive optics in large sizes: computer-generated holograms (CGH) based on Bayfol HX photopolymer

Friedrich-Karl Bruder, Thomas Fäcke, Rainer Hagen, Dennis Hönel, Tim Patrick Kleinschmidt, Enrico Orselli, Christian Rewitz, Thomas Rölle, Günther Walze

Proceedings Volume 9385, 93850C (2015) https://doi.org/10.1117/12.2077139

KEYWORDS: Holographic optical elements, Holography, Spatial light modulators, Holograms, Diffraction, Printing, Picosecond phenomena, Computer generated holography, Beam splitters, Optical filters

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Proceedings Article | 10 March 2015 Paper

Edge-lit volume holograms recorded by free space exposure: diffraction by 2nd harmonics in Bayfol(R) HX film

Friedrich-Karl Bruder, Thomas Fäcke, Rainer Hagen, Dennis Hönel, David Jurbergs, Enrico Orselli, Christian Rewitz, Thomas Rölle, Günther Walze, Brita Wewer

Proceedings Volume 9386, 938601 (2015) https://doi.org/10.1117/12.2077868

KEYWORDS: Diffraction, Picosecond phenomena, Diffraction gratings, Solids, Free space, Optical components, Holograms, Holography, Reflection, RGB color model

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Proceedings Article | 25 February 2014 Paper

Bayfol HX photopolymer for full-color transmission volume Bragg gratings

Horst Berneth, Friedrich-Karl Bruder, Thomas Fäcke, David Jurbergs, Rainer Hagen, Dennis Hönel, Thomas Rölle, Günther Walze

Proceedings Volume 9006, 900602 (2014) https://doi.org/10.1117/12.2038399

KEYWORDS: Diffraction, Reflection, Fiber Bragg gratings, Diffraction gratings, Modulation, Holography, Holograms, Holographic optical elements, Continuous wavelet transforms, Optics manufacturing

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Proceedings Article | 8 May 2013 Paper

Holographic recordings with high beam ratios on improved Bayfol® HX photopolymer

Horst Berneth, Friedrich-Karl Bruder, Thomas Fäcke, Rainer Hagen, Dennis Hönel, Thomas Rölle, Günther Walze, Marc-Stephan Weiser

Proceedings Volume 8776, 877603 (2013) https://doi.org/10.1117/12.2018618

KEYWORDS: RGB color model, Holography, Holograms, Polymers, Diffusers, Picosecond phenomena, Optics manufacturing, Holographic optical elements, Modulation, Diffraction

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Proceedings Article | 7 February 2011 Paper

Holographic recording aspects of high-resolution Bayfol HX photopolymer

Horst Berneth, Friedrich Bruder, Thomas Fäcke, Rainer Hagen, Dennis Hönel, David Jurbergs, Thomas Rölle, Marc-Stephan Weiser

Proceedings Volume 7957, 79570H (2011) https://doi.org/10.1117/12.876202

KEYWORDS: Holograms, RGB color model, Holography, Reflection, Diffusion, Refractive index, Polymers, Spatial frequencies, Photopolymerization, Volume holography

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Proceedings Article | 11 February 2010 Paper

Reaction-diffusion model applied to high resolution Bayfol HX photopolymer

Friedrich-Karl Bruder, Francois Deuber, Thomas Fäcke, Rainer Hagen, Dennis Hönel, David Jurbergs, Thomas Rölle, Marc-Stephan Weiser

Proceedings Volume 7619, 76190I (2010) https://doi.org/10.1117/12.841956

KEYWORDS: Holography, Holograms, RGB color model, Molybdenum, Reflection, Photopolymerization, Chemistry, Data modeling, Polymers, Diffusion

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Proceedings Article | 3 February 2009 Paper

New recording materials for the holographic industry

David Jurbergs, Friedrich-Karl Bruder, Francois Deuber, Thomas Fäcke, Rainer Hagen, Dennis Hönel, Thomas Rölle, Marc-Stephan Weiser, Andy Volkov

Proceedings Volume 7233, 72330K (2009) https://doi.org/10.1117/12.809579

KEYWORDS: Holography, Holograms, Photopolymers, Volume holography, Holographic materials, Transparency, Holography applications, Manufacturing, Chemistry, Data modeling

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Showing 5 of 17 publications

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