Dr. Ralf Ostendorf Profile

Dr. Ralf Ostendorf

Head of Business Unit at Fraunhofer-IAF

SPIE Involvement:

Author

Publications (20)

Proceedings Article | 11 February 2019 Paper

Advances of MOEMS-based external cavity QCLs

M. Haertelt, S. Hugger, L. Butschek, C. Schilling, A. Merten, M. Schwarzenberg, A. Dreyhaupt, J. Grahmann, M. Rattunde, R. Ostendorf

Proceedings Volume 10926, 1092613 (2019) https://doi.org/10.1117/12.2509819

KEYWORDS: Microopto electromechanical systems, Quantum cascade lasers, Infrared spectroscopy, Laser spectroscopy

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Proceedings Article | 29 May 2018 Paper

Towards a compact, portable, handheld device for contactless real-time standoff detection of hazardous substances

Christopher Carson, John Macarthur, Matthew Warden, David Stothard, Lorenz Butschek, Stefan Hugger, Jan-Philip Jarvis, Marko Haertelt, Ralf Ostendorf, Andre Merten, Markus Schwarzenberg, Jan Grahmann, Marcin Ratajczyk

Proceedings Volume 10624, 106240F (2018) https://doi.org/10.1117/12.2305711

KEYWORDS: Sensors, Microopto electromechanical systems, Quantum cascade lasers, Standoff detection, Mid-IR, Explosives

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Proceedings Article | 14 March 2018 Presentation

Recent advances of external cavity QCLs with MOEMS diffraction gratings (Conference Presentation)

Ralf Ostendorf, Stefan Hugger, Lorenz Butschek, Jan-Philip Jarvis, Marko Härtelt, André Dreyhaupt, Jan Grahmann, Marcel Rattunde, Joachim Wagner

Proceedings Volume 10540, 105401K (2018) https://doi.org/10.1117/12.2288214

KEYWORDS: Microopto electromechanical systems, Quantum cascade lasers, Diffraction gratings, Imaging spectroscopy, Spectroscopy, Mid-IR, Laser sources, Chemical analysis, Quantum cryptography, Infrared spectroscopy

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SPIE Journal Paper | 12 September 2017 Open Access

Microoptoelectromechanical systems-based external cavity quantum cascade lasers for real-time spectroscopy

Lorenz Butschek, Stefan Hugger, Jan Jarvis, Marko Haertelt, André Merten, Markus Schwarzenberg, Jan Grahmann, David Stothard, Matthew Warden, Christopher Carson, John Macarthur, Frank Fuchs, Ralf Ostendorf, Joachim Wagner

OE, Vol. 57, Issue 01, 011010, (September 2017) https://doi.org/10.1117/12.10.1117/1.OE.57.1.011010

KEYWORDS: Microopto electromechanical systems, Quantum cascade lasers, Spectroscopy, Scanners, Coating, Laser sources, Silicon, Mid-IR, FT-IR spectroscopy, Sensors

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Proceedings Article | 28 April 2017 Presentation

Hyperspectral imaging for standoff trace detection of explosives using quantum cascade lasers (Conference Presentation)

Frank Fuchs, Stefan Hugger, Jan-Philip Jarvis, Marko Härtelt, Quankui Yang, Marcel Rattunde, Ralf Ostendorf, Christian Schilling, Rachid Driad, Rolf Aidam, Joachim Wagner

Proceedings Volume 10111, 101110A (2017) https://doi.org/10.1117/12.2250006

KEYWORDS: Imaging spectroscopy, Explosives, Standoff detection, Spectroscopy, Backscatter, Explosives detection, Hyperspectral imaging, Quantum cascade lasers, Cameras, Image analysis

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Proceedings Article | 27 January 2017 Paper

Real-time spectroscopy enabled by external cavity QCLs with MOEMS diffraction gratings

L. Butschek, S. Hugger, J. Jarvis, M. Haertelt, A. Merten, J. Grahmann, D. Boskovic, F. Fuchs, R. Ostendorf, C. Schilling, M. Rattunde, J. Wagner

Proceedings Volume 10111, 101112G (2017) https://doi.org/10.1117/12.2251915

KEYWORDS: Microopto electromechanical systems, Spectroscopy, Quantum cascade lasers, Mid-IR, Scanners, Laser sources, Absorption, Sensors, Pulsed laser operation, FT-IR spectroscopy

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Proceedings Article | 25 May 2016 Paper

Imaging standoff trace detection of explosives using IR-laser based backscattering

F. Fuchs, S. Hugger, J. Jarvis, Q. Yang, R. Ostendorf, Ch. Schilling, W. Bronner, R. Driad, R. Aidam, J. Wagner

Proceedings Volume 9836, 98362I (2016) https://doi.org/10.1117/12.2223581

KEYWORDS: Imaging spectroscopy, Explosives, Backscatter, Spectroscopy, Standoff detection, Hyperspectral imaging, Quantum cascade lasers, Forensic science, Molecular spectroscopy, Laser spectroscopy, Cameras, Mid-IR, Detection and tracking algorithms, Mirrors

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Proceedings Article | 12 May 2016 Paper

Hyperspectral image analysis for standoff trace detection using IR laser spectroscopy

J. Jarvis, F. Fuchs, S. Hugger, R. Ostendorf, L. Butschek, Q. Yang, A. Dreyhaupt, J. Grahmann, J. Wagner

Proceedings Volume 9824, 98240V (2016) https://doi.org/10.1117/12.2223604

KEYWORDS: Hyperspectral imaging, Imaging spectroscopy, Spectroscopy, Backscatter, Target detection, Detection and tracking algorithms, Sensors, Microopto electromechanical systems, Quantum cascade lasers, Data modeling

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Proceedings Article | 13 February 2016 Paper

Quantum cascade laser based active hyperspectral imaging for standoff detection of chemicals on surfaces

S. Hugger, F. Fuchs, J. Jarvis, Q. Yang, M. Rattunde, R. Ostendorf, C. Schilling, R. Driad, W. Bronner, R. Aidam, J. Wagner, T. Tybussek, K. Rieblinger

Proceedings Volume 9755, 97550A (2016) https://doi.org/10.1117/12.2210913

KEYWORDS: Imaging spectroscopy, Hyperspectral imaging, Spectroscopy, Standoff detection, Quantum cascade lasers, Mid-IR, Explosives detection, Backscatter, Cameras, Absorption, Contamination

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Proceedings Article | 13 February 2016 Paper

Real-time spectroscopic sensing using a widely tunable external cavity-QCL with MOEMS diffraction grating

Ralf Ostendorf, Lorenz Butschek, André Merten, Jan Grahmann, Jan Jarvis, Stefan Hugger, Frank Fuchs, Joachim Wagner

Proceedings Volume 9755, 975507 (2016) https://doi.org/10.1117/12.2209064

KEYWORDS: Microopto electromechanical systems, Spectroscopy, Diffraction gratings, Quantum cascade lasers, Imaging spectroscopy, Tunable lasers, Laser spectroscopy, Gas lasers, Carbon monoxide, Absorption, Scanners, Spectral resolution, FT-IR spectroscopy, Light sources

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Proceedings Article | 22 May 2015 Paper

Standoff trace detection of explosives with infrared hyperspectral imagery

F. Fuchs, S. Hugger, J.-P. Jarvis, Q. Yang, F. Zaum, R. Ostendorf, Ch. Schilling, W. Bronner, R. Driad, R. Aidam, J. Wagner

Proceedings Volume 9467, 94672O (2015) https://doi.org/10.1117/12.2176361

KEYWORDS: Backscatter, Explosives, Imaging spectroscopy, Polarization, Hyperspectral imaging, Spectroscopy, Quantum cascade lasers, Mie scattering, Standoff detection, Imaging systems

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Proceedings Article | 27 February 2015 Paper

Large MOEMS diffraction grating results providing an EC-QCL wavelength scan of 20%

Jan Grahmann, André Merten, Andreas Herrmann, Ralf Ostendorf, Daniela Bleh, Christian Drabe, Jörg Kamenz

Proceedings Volume 9375, 93750W (2015) https://doi.org/10.1117/12.2079640

KEYWORDS: Mirrors, Microopto electromechanical systems, Quantum cascade lasers, Etching, Signal processing, Diffraction gratings, Coating, Oxides, Silicon, Spectroscopy

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Proceedings Article | 8 February 2015 Paper

Widely tunable quantum cascade lasers for spectroscopic sensing

J. Wagner, R. Ostendorf, J. Grahmann, A. Merten, S. Hugger, Jan Philip Jarvis, F. Fuchs, D. Boskovic, H. Schenk

Proceedings Volume 9370, 937012 (2015) https://doi.org/10.1117/12.2082794

KEYWORDS: Microopto electromechanical systems, Spectroscopy, Imaging spectroscopy, Quantum cascade lasers, Explosives, Backscatter, Chemical analysis, Mirrors, Diffraction gratings, Scanners

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Proceedings Article | 7 March 2014 Paper

Tunable External Cavity Quantum Cascade Lasers (EC-QCL): an application field for MOEMS based scanning gratings

Jan Grahmann, André Merten, Ralf Ostendorf, Michael Fontenot, Daniela Bleh, Harald Schenk, Hans-Joachim Wagner

Proceedings Volume 8977, 897708 (2014) https://doi.org/10.1117/12.2039950

KEYWORDS: Mirrors, Quantum cascade lasers, Microopto electromechanical systems, Silicon, Etching, Chemical analysis, Micromirrors, Collimation, Tolerancing, Spectrometers

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Proceedings Article | 29 May 2013 Paper

Infrared hyperspectral standoff detection of explosives

F. Fuchs, S. Hugger, J. Jarvis, V. Blattmann, M. Kinzer, Q. Yang, R. Ostendorf, W. Bronner, R. Driad, R. Aidam, J. Wagner

Proceedings Volume 8710, 87100I (2013) https://doi.org/10.1117/12.2015682

KEYWORDS: Explosives, Backscatter, Image analysis, Detection and tracking algorithms, Standoff detection, Quantum cascade lasers, Hyperspectral imaging, Cameras, Infrared radiation, Spectroscopy

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Proceedings Article | 24 February 2009 Paper

Packaging influence on laser bars of different dimensions

Thomas Westphalen, Michael Leers, Marcel Werner, Martin Traub, Hans-Dieter Hoffmann, Ralf Ostendorf

Proceedings Volume 7198, 71980K (2009) https://doi.org/10.1117/12.810483

KEYWORDS: Resonators, Packaging, Semiconductor lasers, Reliability, Laser development, High power lasers, Polarization, Laser resonators, Resistance, Electroluminescence

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Proceedings Article | 24 February 2009 Paper

High-power frequency stabilized tapered diode amplifiers at 1064 nm

R. Ostendorf, C. Schilling, G. Kaufel, R. Moritz, J. Wagner, G. Kochem, P. Friedmann, J. Gilly, M. Kelemen

Proceedings Volume 7198, 719811 (2009) https://doi.org/10.1117/12.808107

KEYWORDS: Optical amplifiers, Semiconductor lasers, Fiber Bragg gratings, Fiber amplifiers, Modulation, Laser stabilization, Diodes, Collimation, Laser applications, Heatsinks

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Proceedings Article | 25 February 2008 Paper

5 W frequency stabilized 976 nm tapered diode lasers

Patrick Friedmann, Jürgen Gilly, Stefan Moritz, Ralf Ostendorf, Márc Kelemen

Proceedings Volume 6876, 68761J (2008) https://doi.org/10.1117/12.760932

KEYWORDS: Optical amplifiers, Semiconductor lasers, Diffraction, Second-harmonic generation, Laser stabilization, Antireflective coatings, High power lasers, Continuous wave operation, Coating, Diodes

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Proceedings Article | 13 February 2008 Paper

10 W high-efficiency high-brightness tapered diode lasers at 976 nm

R. Ostendorf, G. Kaufel, R. Moritz, M. Mikulla, O. Ambacher, M. Kelemen, J. Gilly

Proceedings Volume 6876, 68760H (2008) https://doi.org/10.1117/12.761124

KEYWORDS: Semiconductor lasers, Monochromatic aberrations, Diffraction, Temperature metrology, Heatsinks, Quantum wells, Near field optics, Fiber amplifiers, Continuous wave operation, Virtual point source

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Proceedings Article | 29 January 2008 Paper

High brightness quantum well and quantum dot tapered lasers

N. Michel, M. Krakowski, I. Hassiaoui, M. Calligaro, M. Lecomte, O. Parillaud, P. Weinmann, C. Zimmermann, W. Kaiser, M. Kamp, A. Forchel, E.-M. Pavelescu, J.-P. Reithmaier, B. Sumpf, G. Erbert, M. Kelemen, R. Ostendorf, J-M. García-Tijero, H. Odriozola, I. Esquivias

Proceedings Volume 6909, 690918 (2008) https://doi.org/10.1117/12.787115

KEYWORDS: Continuous wave operation, Quantum dots, Quantum wells, Pulsed laser operation, Laser stabilization, Waveguides, High power lasers, Quantum efficiency, Semiconductor lasers, Laser applications

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Showing 5 of 20 publications

Conference Committee Involvement (4)

Emerging Technologies IV

11 September 2019 | Strasbourg, France

Emerging Technologies

12 September 2018 | Berlin, Germany

Emerging Imaging and Sensing Technologies

13 September 2017 | Warsaw, Poland

Emerging Imaging and Sensing Technologies

28 September 2016 | Edinburgh, United Kingdom

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