Dr. Yuri V. Flores Profile

Dr. Yuri V. Flores

at Fraunhofer-IAF

SPIE Involvement:

Author

Publications (11)

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 | 1 March 2019 Presentation + Paper

Effects of elastic scattering on high-performance step-taper active-region quantum cascade lasers

Colin Boyle, Kevin Oresick, Jeremy Kirch, Luke Mawst, Don Lindberg , Thomas Earles, Yuri Flores, Dan Botez

Proceedings Volume 10939, 109391L (2019) https://doi.org/10.1117/12.2510386

KEYWORDS: Quantum cascade lasers, Scattering, Picosecond phenomena, Laser scattering, Mid-IR, Electroluminescence, Continuous wave operation, Quantum efficiency, Internal quantum efficiency, Semiconductor lasers

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SPIE Journal Paper | 27 September 2017 Open Access

Design considerations for λ ∼ 3.0- to 3.5-μm-emitting quantum cascade lasers on metamorphic buffer layers

Ayushi Rajeev, Chris Sigler, Thomas Earles, Yuri Flores, Luke Mawst, Dan Botez

OE, Vol. 57, Issue 01, 011017, (September 2017) https://doi.org/10.1117/12.10.1117/1.OE.57.1.011017

KEYWORDS: Quantum cascade lasers, Cladding, Gallium, Scattering, Picosecond phenomena, Quantum wells, Autoregressive models, Indium gallium phosphide, Aluminum, Electroluminescence

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Proceedings Article | 21 October 2016 Presentation + Paper

Design issues and physics for power scaling of quantum-cascade lasers

W. Masselink, M. Semtsiv, Y. Flores, A. Aleksandrova, J. Kischkat

Proceedings Volume 9989, 99890B (2016) https://doi.org/10.1117/12.2241431

KEYWORDS: Quantum cascade lasers, Laser scattering, Scattering, Electrons, Neptunium, Continuous wave operation, Laser countermeasures, Waveguides, Physics

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Proceedings Article | 27 February 2014 Paper

The role of electron temperature in the leakage current in QCLs and its impact on the quantum efficiency

Yuri Flores, Sergii Kurlov, Mikaela Elagin, Mykhaylo Semtsiv, W. Ted Masselink

Proceedings Volume 9002, 90021R (2014) https://doi.org/10.1117/12.2036371

KEYWORDS: Laser scattering, Scattering, Quantum cascade lasers, Quantum efficiency, Temperature metrology, Interfaces, Thallium, Solids, Resonators, Tellurium

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Proceedings Article | 27 February 2014 Paper

AlAs/InAlAs-InGaAs QCLs grown by gas-source molecular-beam epitaxy

W. Masselink, M. Semtsiv, Y. Flores, Sergii Kurlov, M. Elagin, G. Monastyrskyi, J.-F. Kischkat, A. Aleksandrova

Proceedings Volume 9002, 90021A (2014) https://doi.org/10.1117/12.2036359

KEYWORDS: Quantum cascade lasers, Scattering, Laser scattering, Composites, Electrons, Heterojunctions, Interfaces, Epitaxy, Indium gallium arsenide, Thermal effects

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Proceedings Article | 25 October 2013 Paper

Design, fabrication, and applications of ultra-narrow infrared bandpass interference filters

Jan Kischkat, Sven Peters, Mykhaylo Semtsiv, Tristan Wegner, Mikaela Elagin, Grygorii Monastyrskyi, Yuri Flores, Sergii Kurlov, W. Ted Masselink

Proceedings Volume 8896, 889614 (2013) https://doi.org/10.1117/12.2029336

KEYWORDS: Quantum cascade lasers, Infrared radiation, Germanium, FT-IR spectroscopy, Absorption, Coating, Eye, Infrared imaging, Collimation, Fabry–Perot interferometers

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Proceedings Article | 15 October 2013 Paper

Design issues and physics for high-performance quantum-cascade lasers

W. Masselink, M. Semtsiv, M. Elagin, Y. Flores, G. Monastyrskyi, S. Kurlov, J. Kischkat

Proceedings Volume 8898, 889805 (2013) https://doi.org/10.1117/12.2028225

KEYWORDS: Laser scattering, Scattering, Quantum cascade lasers, Quantum efficiency, Interfaces, Electrons, Temperature metrology, Physics, Composites, Phonons

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Proceedings Article | 6 March 2013 Paper

Analysis of thermally activated leakage current in a low-threshold-current quantum-cascade laser emitting at 3.9 μm

Yuri V. Flores, Grygorii Monastyrskyi, Mikaela Elagin, Mykhaylo Semtsiv, W. Ted Masselink

Proceedings Volume 8640, 86401S (2013) https://doi.org/10.1117/12.2002590

KEYWORDS: Laser scattering, Scattering, Interfaces, Quantum cascade lasers, Electrons, Semiconductor lasers, Solids, Laser processing, Mirrors, Phonons

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Proceedings Article | 28 February 2012 Paper

Effect of ridge waveguide etch depth on laser threshold of InGaN MQW laser diodes

L. Redaelli, M. Martens, J. Piprek, H. Wenzel, C. Netzel, A. Linke, Yu. Flores, S. Einfeldt, M. Kneissl, G. Tränkle

Proceedings Volume 8262, 826219 (2012) https://doi.org/10.1117/12.908368

KEYWORDS: Semiconductor lasers, Laser damage threshold, Waveguides, Etching, Indium gallium nitride, Quantum wells, Electron beam lithography, Diodes, Gallium nitride, Semiconducting wafers

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Showing 5 of 11 publications

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