Dr. Gregor Langer Profile

Dr. Gregor Langer

Project Leader at Austria Technologie & Systemtechnik Ag

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Publications (12)

Proceedings Article | 25 September 2014 Paper

Foil based optical elements for beam shaping and color homogenization of phosphor converted white LED sources

Franz Wenzl, Wolfgang Nemitz, Ladislav Kuna, Christian Sommer, Paul Fulmek, Johann Nicolics, Peter Pachler, Hans Hoschopf, Franz Schrank, Gregor Langer, Paul Hartmann

Proceedings Volume 9190, 91900A (2014) https://doi.org/10.1117/12.2061944

KEYWORDS: Collimators, Light emitting diodes, Light, Light sources, Optical components, Beam shaping, Collimation, Lenses, Positron emission tomography, Integrated optics

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Proceedings Article | 25 September 2014 Paper

The impact of individual materials parameters on color temperature reproducibility among phosphor converted LED sources

Susanne Schweitzer, Wolfgang Nemitz, Christian Sommer, Paul Hartmann, Paul Fulmek, Johann Nicolics, Peter Pachler, Hans Hoschopf, Franz Schrank, Gregor Langer, Franz Wenzl

Proceedings Volume 9190, 91900S (2014) https://doi.org/10.1117/12.2061921

KEYWORDS: Light emitting diodes, Refractive index, Particles, Silicon, Reflectivity, LED lighting, Sensors, Solid state lighting, Light, Blue light emitting diodes

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Proceedings Article | 30 September 2013 Paper

Thermal and optical aspects of glob-top design for phosphor converted white LED light sources

Christian Sommer, Paul Fulmek, Johann Nicolics, Susanne Schweitzer, Wolfgang Nemitz, Paul Hartmann, Peter Pachler, Hans Hoschopf, Franz Schrank, Gregor Langer, Franz Wenzl

Proceedings Volume 8835, 88350J (2013) https://doi.org/10.1117/12.2024887

KEYWORDS: Light emitting diodes, Reflectivity, Thermography, Blue light emitting diodes, LED lighting, Particles, Silicon, Absorption, 3D modeling, Photons

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Proceedings Article | 30 September 2013 Paper

The impact of the color conversion element configuration on its thermal response in phosphor converted LEDs

Franz Wenzl, Paul Fulmek, Christian Sommer, Paul Hartmann, Peter Pachler, Hans Hoschopf, Franz Schrank, Gregor Langer, Johann Nicolics

Proceedings Volume 8835, 88350N (2013) https://doi.org/10.1117/12.2024886

KEYWORDS: Light emitting diodes, Blue light emitting diodes, Absorption, Silicon, Particles, Optical simulations, Light, Quantum efficiency, Thermography, 3D modeling

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Proceedings Article | 15 October 2012 Paper

White light quality of phosphor converted LEDs from a phosphor materials perspective of view: an evaluation based on combined thermal and optical simulations

Franz-Peter Wenzl, Christian Sommer, Paul Hartmann, Peter Pachler, Hans Hoschopf, Gregor Langer, Paul Fulmek, Johann Nicolics

Proceedings Volume 8484, 848403 (2012) https://doi.org/10.1117/12.929970

KEYWORDS: Light emitting diodes, Quantum efficiency, Optical simulations, Particles, Absorption, Silicon, Blue light emitting diodes, Photons, Convection, Light

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Proceedings Article | 15 October 2012 Paper

The impact of the silicone encapsulation layers on the white light quality of phosphor converted LEDs

Susanne Schweitzer, Christian Sommer, Paul Hartmann, Wolfgang Nemitz, Peter Pachler, Hans Hoschopf, Gregor Langer, Paul Fulmek, Johann Nicolics, Franz Wenzl

Proceedings Volume 8484, 84840N (2012) https://doi.org/10.1117/12.929950

KEYWORDS: Silicon, Light emitting diodes, Refractive index, Light, Solid state lighting, Coating, Sensors, Blue light emitting diodes, General lighting, Particles

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Proceedings Article | 18 January 2011 Paper

PCB with fully integrated optical interconnects

Gregor Langer, Valentin Satzinger, Volker Schmidt, Gerhard Schmid, Walter Leeb

Proceedings Volume 7944, 794408 (2011) https://doi.org/10.1117/12.873744

KEYWORDS: Waveguides, Photodiodes, Vertical cavity surface emitting lasers, Optoelectronic devices, Optical interconnects, Copper, Semiconductor lasers, Integrated optics, Optics manufacturing, Interfaces

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Proceedings Article | 21 August 2009 Paper

Two-photon patterning of optical waveguides in flexible polymers

Sabine Bichler, Sonja Feldbacher, Rachel Woods, Valentin Satzinger, Volker Schmidt, Georg Jakopic, Gregor Langer, Wolfgang Kern

Proceedings Volume 7413, 74130W (2009) https://doi.org/10.1117/12.828393

KEYWORDS: Waveguides, Refractive index, Silicon, Cladding, Polymers, Optical interconnects, Polymerization, Microscopy, Phase contrast, Semiconductor lasers

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Over the last few years two-photon based photo-processes have become an important method to generate 3D microstructures in organic materials without the use of masks and molds. The present work deals with the fabrication of optical waveguides in a flexible polysiloxane matrix for data transmission on printed circuit boards (PCB). In the developed system the waveguide core is formed by two-photon induced photo polymerization (TPIP) of selected monomers, which are dissolved in a silicone matrix. Through the photo-induced polymerization an interpenetrating network is generated, resulting in a refractive index change between the illuminated waveguide cladding and the illuminated core material. Because of the optical transparency, flexibility, chemical and thermal stability polysiloxanes were chosen as optical matrix material. Different types of phenyl methacrylates with a high refractive index were used as monomers. In order to obtain a high contrast in refractive index, the monomers were removed from non-illuminated regions in a vacuum process after laser exposure. The written optical waveguides were evidenced by phase contrast microscopy, revealing an excellent structuring behaviour of the developed material. Optical techniques e.g. cut-back measurements and light extraction tests were applied to characterize the inscribed waveguide structures and to detect the resulting optical loss. To determine the refractive index change upon UV-irradiation spectroscopic ellipsometry was applied. Thus, a difference of Δn=0.02 between the non-illuminated cladding and the illuminated core material was detected. Further, prototypes of optical interconnects on PCBs were fabricated by inscription of a waveguide bundle between a mounted laser and photo diode, resulting in the desired increase of the transmitted photocurrent after TPA structuring. In conclusion, the obtained results demonstrate that fully flexible optical interconnects are accessible by the developed process.

Proceedings Article | 27 August 2008 Paper

Optoelectronic printed circuit board: 3D structures written by two-photon absorption

R. Houbertz, V. Satzinger, V. Schmid, W. Leeb, G. Langer

Proceedings Volume 7053, 70530B (2008) https://doi.org/10.1117/12.798817

KEYWORDS: Waveguides, Optoelectronics, Polymers, Absorption, Optoelectronic devices, Integrated optics, Lithography, Ultraviolet radiation, Photodiodes, Optical interconnects

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Proceedings Article | 7 March 2007 Paper

Two-photon absorption for the realization of optical waveguides on printed circuit boards

Gregor Langer, Markus Riester

Proceedings Volume 6475, 64750X (2007) https://doi.org/10.1117/12.699382

KEYWORDS: Waveguides, Polymers, Integrated optics, Optoelectronic devices, Absorption, Optical interconnects, Refractive index, Vertical cavity surface emitting lasers, Optics manufacturing, Semiconductor lasers

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The integration of optical interconnections in printed circuit boards (PCBs) is an emerging field that arouses rapidly growing interest worldwide. At present the key issue is to identify a technical concept, which allows for the realization of optical interconnections that are compatible to existing PCB manufacturing processes. Above all, the material in which the optical interconnections are embedded has to withstand increased temperatures and lamination pressures as well as various wet chemistry processes. AT&S uses so-called two-photon absorption (TPA) laser structuring - a rather new and innovative technology - to realize optical circuits in a special polymer layer. In this case a near infrared laser is applied working in the femto-second regime. The high photon density that can be reached in the laser's focus results in a modification of the optical polymer, which is usually photosensitive in the UV-spectrum of light only. In our particular case, the refractive index of the optical polymer is increased. Choosing the right laser intensity and focus propagation speed one achieves a waveguide well embedded within the polymer layer, which has not been affected by the laser. In contrast to one-photon absorption, which only allows a two dimensional respectively lateral modification of a polymer, this technology allows a modification within the volume resulting in 3D-microstructures inside the polymer layer. Apart from the possibility to realize structures in three dimensions, this TPA-technique has additional advantages. First of all, it allows one step fabrication, which reduces costs and production time compared to etching procedures or conventional UV lithography processes. Moreover, this technique allows varying the waveguide's cross section geometry and diameter simply varying size and form of the structuring laser focus. Whereas the realization of optical waveguides is not challenging anymore the coupling of waveguides with optoelectronic components is rather delicate. That is, the waveguide's ends have to be accurately positioned close to the emitting surface of the signal source and the sensing area of the light detector, respectively. Using the TPA technology to structure optical waveguides AT&S has successfully evaluated a powerful method to solve this interface problem for the realization of integrated optical interconnections (IOIs) on PCBs.

Proceedings Article | 6 February 2007 Paper

Integrated optical interconnections on printed circuit boards

Markus Riester, Gregor Langer, Günther Leising

Proceedings Volume 6478, 64780A (2007) https://doi.org/10.1117/12.713937

KEYWORDS: Waveguides, Optics manufacturing, Connectors, Integrated optics, Manufacturing, Standards development, Optical interconnects, Optical alignment, Optical components, Optoelectronics

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Proceedings Article | 23 November 2005 Paper

Focus image feedback-controlled 3D laser microstructuring

Volker Schmidt, Ladislav Kuna, Georg Jakopic, Ernst Wildling, Gregor Langer, Günther Leising

Proceedings Volume 6002, 60021C (2005) https://doi.org/10.1117/12.631116

KEYWORDS: Waveguides, Semiconductor lasers, 3D image processing, Polymers, Photonics, Glasses, Machine vision, Diodes, Digital image processing, Laser processing

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Showing 5 of 12 publications

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