Dr. Marko Härtelt Profile

Dr. Marko Härtelt

at Fraunhofer IAF

SPIE Involvement:

Author

Publications (9)

Proceedings Article | 20 June 2024 Presentation + Paper

Multiplexed dual-core QCL-based sensor for real-time standoff-spectroscopy in crime scene investigations

Marko Haertelt, Yuri Flores, Markus Schwarzenberg, Andre Merten, Christian Ulrich, Frank Schnürer

Proceedings Volume 12999, 129990K (2024) https://doi.org/10.1117/12.3022543

KEYWORDS: Sensors, Quantum cascade lasers, Microopto electromechanical systems, Backscatter, Multiplexing, Explosives, Infrared sensors, Forensic science, Biological samples, Spectroscopy

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Proceedings Article | 7 June 2024 Presentation + Paper

Fast broadband QCL-based chemical detection: an optical alternative for road surface reconnaissance

Frank Wilsenack, Fabian Meyer, Yuri Flores, Marko Haertelt, Mario Adelhardt

Proceedings Volume 13056, 130560C (2024) https://doi.org/10.1117/12.3013650

KEYWORDS: Quantum cascade lasers, Contamination, Roads, Data acquisition, Chemical detection, Silicon, Reconnaissance, Optical surfaces, Spatial resolution

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Fastly detecting hazardous, non-volatile chemical substances on paved roads and streets is a topic of utmost military importance in an area denial scenario. Since the 1980s, inherently slow manual sampling has been avoided on armored vehicles using a small silicone wheel that continuously accumulates surface contaminations. After a given sampling period, collected (and potentially hazardous) contaminants on the wheel are thermally desorbed and analyzed by mass spectrometry. This approach led to further technological advancements, including implementing a double-wheel sampling system for automated, uninterrupted operation. Suspicious areas are examined at low driving speeds (approximating a fast-walking speed) with comparatively low spatial resolution, as the silicone wheels can only be rolled comparatively slowly to ensure continuous surface contact. Incremental improvements may further optimize the double-wheel sampling system. In that context, we are currently investigating laser desorption technology to achieve a more targeted heat treatment of the complete silicone wheel and increase spatial resolution and sensitivity. In addition, we also contribute to the development of advanced ion mobility spectrometers, which are both fast scanning and highly sensitive, as a viable alternative to cumbersome mass spectrometers. As a radically different approach, we report here on a measurement system using back-scattering IR-spectroscopy to optically interrogate samples at a standoff distance and process the information without delay. The used IR light source consists of three coupled broadband quantum cascade laser modules, each with an integrated micro-opto-electro-mechanical grating scanner (MOEMS EC-QCL). The elaborate coupling of three such pulsed laser modules provides an ultra-broadband spectral scan within the IR-fingerprint area (covered by those three MOEMS EC-QCLs) at a repetition rate of almost one kilohertz, thus resulting in measurement times of as short as one millisecond per (ultra-broadband) spectrum. We found that even minor contaminations of hazardous substances are identified using this setup. Furthermore, preliminary laboratory tests revealed a successful detection after the measurements on a fast-moving contaminated object. The experiments were performed at different observation angles with a considerable focal depth. The proof of concept shows that this novel QCL-based chemical detection approach is fast enough and promising to continuously monitor the ground with sufficient geometric resolution at cruise speeds on uneven and textured surfaces.

Proceedings Article | 7 June 2024 Presentation + Paper

Laser-based infrared sensor for fast and non-contact detection and identification of forensic traces in crime scene investigations

Marko Haertelt, Yuri Flores, Christian Ulrich, Frank Schnürer

Proceedings Volume 13056, 1305605 (2024) https://doi.org/10.1117/12.3014160

KEYWORDS: Quantum cascade lasers, Forensic science, Explosives, Microopto electromechanical systems, Biological samples, Infrared sensors, Sensors, Semiconductor lasers

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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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Showing 5 of 9 publications

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