Dr. Julien Fade Profile

Dr. Julien Fade

at Institut FOTON

SPIE Involvement:

Conference Program Committee | Author

Proceedings Article | 20 April 2020 Presentation + Paper

Near-infrared active and selective polarization imaging by orthogonality-breaking: calibration of the acquisition chain

Jonathan Staes, François Parnet, Julien Fade, Noé Ortega-Quijano, Mehdi Alouini

Proceedings Volume 11351, 113511E (2020) https://doi.org/10.1117/12.2555880

KEYWORDS: Polarization, Polarimetry, Calibration, Demodulation, Signal detection, Modulation, Anisotropy, Imaging systems, Birefringence, Polarizers

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Proceedings Article | 1 April 2020 Presentation

Full-field all-optical snapshot technique for QUADrature (FAST-QUAD) demodulation of optical signals at radio-frequencies: principle and experimental proof-of-concept (Conference Presentation)

Swapnesh Panigrahi, Julien Fade, Romain Agaisse, Hema Ramachandran, Mehdi Alouini

Proceedings Volume 11351, 1135118 (2020) https://doi.org/10.1117/12.2555009

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Since long, optical intensity modulation/demodulation techniques have encountered numerous applications in telemetry, free-space communications or optical characterization of scattering media. Upgrading those techniques to a full-field, real-time imaging modality can allow massive multiplexing, an essential asset not only for 3D imaging or optical communications, but also for imaging in turbid media (medical diagnosis, underwater vision, imaging in colloids, or navigational aid for safe transports). In this context, we have recently proposed a new concept of Full-field All-optical Snapshot Technique for QUADrature demodulation imaging (FAST-QUAD), whose capacity in real-time image demodulation have been demonstrated up to frequencies of 500 kHz, without requiring any synchronization between the receiver and the intensity-modulated source(s) in the imaged scene. This technique relies on an all-optical architecture, at the heart of which is an electro-optical crystal and appropriate polarization optics components, making it possible to spatially multiplex four transmission « gates » in quadrature to each other (0°, 90°, 180°, 270°), addressing four sub-images detected on the same single standard sensor (CCD/CMOS). This setup behaves as a quadrature lock-in detection circuit, well-known in the electronics field, but in the optical domain and in a massively spatially multiplexed way, using the acquisition time of the camera as a low-pass integrator. This optical module can therefore be inserted in front of any camera, and allows the number of electronics components to be minimized. This property provides FAST-QUAD with a major asset, as its operating frequency is fully and continuously tunable in the RF range, which allowed us to establish an experimental proof-of-concept between 0 Hz (DC) and 500 kHz on the first prototype built in the laboratory. We will detail the instrumental conception of this prototype as well as the calibration/processing pipeline developed. Experimental validation results and examples of application of the FAST-QUAD approach will also be presented.

SPIE Journal Paper | 9 February 2019

Characterization of a polarimetric infrared imager based on the orthogonality breaking technique

François Parnet, Julien Fade, Muriel Roche, Goulc’hen Loas, Noé Ortega-Quijano, Ludovic Frein, Mehdi Alouini

OE, Vol. 58, Issue 08, 082407, (February 2019) https://doi.org/10.1117/12.10.1117/1.OE.58.8.082407

KEYWORDS: Imaging systems, Polarimetry, Image segmentation, Polarizers, Signal detection, Infrared imaging, Infrared radiation, Temporal coherence, Polarization, Near infrared

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Proceedings Article | 19 September 2017 Presentation + Paper

Active infrared polarimetric imaging demonstrator by orthogonality breaking sensing

François Parnet, Julien Fade, Noé Ortega-Quijano, Goulc'hen Loas, Ludovic Frein, Mehdi Alouini

Proceedings Volume 10407, 104070S (2017) https://doi.org/10.1117/12.2273309

KEYWORDS: Polarimetry, Polarization, Infrared imaging, Infrared radiation, Target detection, Infrared detectors, Infrared sensors, Imaging systems, Active remote sensing, Manufacturing

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Proceedings Article | 15 October 2015 Paper

Noise correlation-based adaptive polarimetric image representation for contrast enhancement of a polarized beacon in fog

Swapnesh Panigrahi, Julien Fade, Mehdi Alouini

Proceedings Volume 9643, 96430C (2015) https://doi.org/10.1117/12.2195216

KEYWORDS: Polarimetry, Polarization, Cameras, Image processing, Fiber optic gyroscopes, Image enhancement, Image contrast enhancement, Visibility, Image filtering, Imaging systems

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Proceedings Article | 1 September 2015 Paper

Polarizer-free degree of polarization computational imaging from a single speckle image

J. Fade, M. Roche, M. Alouini

Proceedings Volume 9613, 961302 (2015) https://doi.org/10.1117/12.2188599

KEYWORDS: Polarization, Speckle, Computational imaging, Statistical analysis, Remote sensing, Current controlled current source, Charge-coupled devices, Information operations, Image acquisition, Reflectivity

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Proceedings Article | 1 September 2015 Paper

Optimal contrast enhancement in long distance snapshot polarimetric imaging through fog

Swapnesh Panigrahi, Julien Fade, Mehdi Alouini

Proceedings Volume 9613, 96130V (2015) https://doi.org/10.1117/12.2188590

KEYWORDS: Polarimetry, Image processing, Cameras, Fiber optic gyroscopes, Polarization, Solids, Visibility through fog, Visibility, Sensors, Enhanced vision

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Proceedings Article | 1 September 2015 Paper

Single shot diattenuation imaging by circular polarization orthogonality breaking

Noé Ortega-Quijano, Julien Fade, Emmanuel Schaub, François Parnet, Mehdi Alouini

Proceedings Volume 9613, 961303 (2015) https://doi.org/10.1117/12.2188569

KEYWORDS: Polarimetry, Dichroic materials, Polarization, Polarizers, Biomedical optics, Statistical analysis, Signal detection, Mirrors, Bragg cells, Wave plates

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Proceedings Article | 30 September 2011 Paper

Supercontinuum laser absorption spectroscopy in the mid-infrared range for identification and concentration estimation of a multi-component atmospheric gas mixture

Nicolas Cezard, Alexandre Dobroc, Guillaume Canat, Mathieu Duhant, William Renard, Claire Alhenc-Gelas, Sidonie Lefebvre, Julien Fade

Proceedings Volume 8182, 81820V (2011) https://doi.org/10.1117/12.898227

KEYWORDS: Absorption, ZBLAN, Mid-IR, Interference (communication), Spectroscopy, Laser spectroscopy, Atmospheric laser remote sensing, Absorption spectroscopy, Received signal strength, Fiber lasers

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