Dr. Luc Froehly Profile

Dr. Luc Froehly

Senior Researcher at FEMTO-ST

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Author

Publications (19)

Proceedings Article | 28 June 2023 Open Access

Teaching through history: the preservation of modern French scientific heritage in optics

Jeanne Magnin, Jeremy Querenet, Luc Froehly, Jerome Salvi, Maxime Jacquot, Ariel Levenson, John Dudley

Proceedings Volume 12723, 127230F (2023) https://doi.org/10.1117/12.2666612

KEYWORDS: Equipment, Physics, Visibility, Photonics, Photography, Laser optics, Holograms, Laser development, Optics education, Optical components

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Proceedings Article | 17 March 2023 Presentation

Generation of micro-pillars by ultrafast first-order Bessel beam

Valeria Viviana Belloni, Mostafa Hassan, Luc Froehly, Luca Furfaro, Cyril Billet, Remo Giust, Francois Courvoisier

Proceedings Volume PC12411, PC124110E (2023) https://doi.org/10.1117/12.2650125

KEYWORDS: Bessel beams, Ultrafast phenomena, Sapphire, Solids, Glasses, Femtosecond phenomena, Etching

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Proceedings Article | 30 May 2022 Poster

Ultrafast laser generation of overcritical, nanoplasmas inside dielectrics

Mostafa Hassan, Kazem Ardaneh, Rémi Meyer, Remo Giust, Xie Chen, Benoit Morel, Ismail Ouadghiri-Idrissi, Luca Furfaro, Luc Froehly, Arnaud Couairon, Guy Bonnaud, Francois Courvoisier

Proceedings Volume PC12132, PC121320K (2022) https://doi.org/10.1117/12.2621444

KEYWORDS: Plasma, Ultrafast lasers, Dielectrics, Plasma generation, Solids, Absorption, Ultraviolet sources, Ultrafast phenomena, Temperature metrology, Solid state physics

Proceedings Article | 1 April 2022 Presentation

Extremely high angle Bessel beam shaper

Valeria Belloni, Luc Froehly, Luca Furfaro, Cyril Billet, François Courvoisier

Proceedings Volume PC11987, PC119870N (2022) https://doi.org/10.1117/12.2609432

KEYWORDS: Bessel beams, Ultrafast phenomena, Photonics, Optical tweezers, Objectives, Nonlinear optics, Nanostructures, Microscopes, Manufacturing, Lenses

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Proceedings Article | 8 March 2021 Presentation

Micrometric Kerr transient grating for in-situ ultrashort probe diagnostic

Chen Xie, Remi Meyer, Luc Froehly, Remo Giust, François Courvoisier

Proceedings Volume 11676, 116760Z (2021) https://doi.org/10.1117/12.2578788

KEYWORDS: Diagnostics, Ultrafast imaging, Ultraviolet radiation, Ultrafast phenomena, UV optics, Signal to noise ratio, Sapphire, Polarization, Optical components, Dispersion

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Proceedings Article | 28 April 2017 Presentation

Arbitrary shaping of non-diffracting beams for filamentation and ultrafast laser materials processing (Conference Presentation)

François Courvoisier, Ismail Ouadghir-Idrissi, Remi Meyer, Remo Giust, Luc Froehly, Maxime Jacquot, John Dudley

Proceedings Volume 10120, 101200I (2017) https://doi.org/10.1117/12.2252784

KEYWORDS: Light-matter interactions, Laser processing, Nondiffracting beams, Bessel beams, Ultrafast lasers, Materials processing, Beam controllers, Process control, Wave propagation interference, Laser beam propagation

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Proceedings Article | 27 April 2016 Paper

Wafer-level fabrication of arrays of glass lens doublets

Nicolas Passilly, Stéphane Perrin, Jorge Albero, Johann Krauter, Olivier Gaiffe, Ludovic Gauthier-Manuel, Luc Froehly, Justine Lullin, Sylwester Bargiel, Wolfgang Osten, Christophe Gorecki

Proceedings Volume 9888, 98880T (2016) https://doi.org/10.1117/12.2228833

KEYWORDS: Optical components, Polishing, Micro optics, Glasses, Optical aberrations, Semiconducting wafers, Microlens

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Systems for imaging require to employ high quality optical components in order to dispose of optical aberrations and thus reach sufficient resolution. However, well-known methods to get rid of optical aberrations, such as aspherical profiles or diffractive corrections are not easy to apply to micro-optics. In particular, some of these methods rely on polymers which cannot be associated when such lenses are to be used in integrated devices requiring high temperature process for their further assembly and separation. Among the different approaches, the most common is the lens splitting that consists in dividing the focusing power between two or more optical components. In here, we propose to take advantage of a wafer-level technique, devoted to the generation of glass lenses, which involves thermal reflow in silicon cavities to generate lens doublets. After the convex lens sides are generated, grinding and polishing of both stack sides allow, on the first hand, to form the planar lens backside and, on the other hand, to open the silicon cavity. Nevertheless, silicon frames are then kept and thinned down to form well-controlled and auto-aligned spacers between the lenses. Subsequent accurate vertical assembly of the glass lens arrays is performed by anodic bonding. The latter ensures a high level of alignment both laterally and axially since no additional material is required. Thanks to polishing, the generated lens doublets are then as thin as several hundreds of microns and compatible with micro-opto-electro-systems (MOEMS) technologies since they are only made of glass and silicon. The generated optical module is then robust and provide improved optical performances. Indeed, theoretically, two stacked lenses with similar features and spherical profiles can be almost diffraction limited whereas a single lens characterized by the same numerical aperture than the doublet presents five times higher wavefront error. To demonstrate such assumption, we fabricated glass lens doublets and compared them to single lenses of equivalent focusing power. For similar illumination, the optical aberrations are significantly reduced.

Proceedings Article | 26 April 2016 Paper

Vertical comb-drive microscanner with 4x4 array of micromirrors for phase-shifting Mirau microinterferometry

Sylwester Bargiel, Justine Lullin, Patrice Lemoal, Stéphane Perrin, Nicolas Passilly, Jorge Albero, Luc Froehly, Franck Lardet-Vieudrin, Christophe Gorecki

Proceedings Volume 9890, 98900D (2016) https://doi.org/10.1117/12.2230487

KEYWORDS: Micromirrors, Silicon, Interferometry, Optical coherence tomography, Phase shifts, Microopto electromechanical systems, Microactuators, Phase shifting, Mirau interferometers, Semiconducting wafers, Photomasks, Etching

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Proceedings Article | 26 April 2016 Paper

Array-type miniature interferometer as the core optical microsystem of an optical coherence tomography device for tissue inspection

Nicolas Passilly, Stéphane Perrin, Justine Lullin, Jorge Albero, Sylwester Bargiel, Luc Froehly, Christophe Gorecki, Johann Krauter, Wolfgang Osten, Wei-Shan Wang, Maik Wiemer

Proceedings Volume 9890, 98900C (2016) https://doi.org/10.1117/12.2229477

KEYWORDS: Skin, Microopto electromechanical systems, Optical coherence tomography, Microsystems, Mirrors, Silicon, Semiconducting wafers, Beam splitters

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Proceedings Article | 26 April 2016 Paper

Aberration retrieval for the characterization of micro-optical components

Stephane Perrin, Nicolas Passilly, Luc Froehly, Christophe Gorecki

Proceedings Volume 9890, 98901A (2016) https://doi.org/10.1117/12.2228847

KEYWORDS: Wavefronts, Phase retrieval, Microlens, Interferometry, Micro optics, Metrology, Optical components, Optical properties, Optical aberrations, Imaging systems, Digital holography, Microscopes, Objectives, Wave propagation

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Proceedings Article | 1 September 2015 Paper

Performance analysis of a full-field and full-range swept-source OCT system

J. Krauter, T. Boettcher, K. Körner, M. Gronle, W. Osten, N. Passilly, L. Froehly, S. Perrin, C. Gorecki

Proceedings Volume 9576, 957609 (2015) https://doi.org/10.1117/12.2189885

KEYWORDS: Optical coherence tomography, Mirrors, Sensors, Light sources, Cameras, Imaging systems, Objectives, Signal processing, Optical imaging, Beam splitters

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Proceedings Article | 22 June 2015 Paper

Full-field swept-source optical coherence tomography with phase-shifting techniques for skin cancer detection

J. Krauter, T. Boettcher, K. Körner, M. Gronle, W. Osten, N. Passilly, L. Froehly, S. Perrin, C. Gorecki

Proceedings Volume 9529, 952913 (2015) https://doi.org/10.1117/12.2189278

KEYWORDS: Optical coherence tomography, Cameras, Phase shifts, Mirrors, Light sources, Signal to noise ratio, Skin cancer, Molybdenum, Interferometers, Phase shifting

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Proceedings Article | 18 August 2014 Paper

Simple setup for optical characterization of microlenses

Stephane Perrin, Maciej Baranski, Nicolas Passilly, Luc Froehly, Jorge Albero, Sylwester Bargiel, Christophe Gorecki

Proceedings Volume 9204, 92040D (2014) https://doi.org/10.1117/12.2061299

KEYWORDS: Microlens, Modulation transfer functions, Imaging systems, Optical components, Microscopes, Objectives, Molybdenum, Wavefronts, 3D metrology, Etching

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Proceedings Article | 1 May 2014 Paper

Metrology of micro-optical components quality using direct measurement of 3D intensity point spread function

Maciej Baranski, Stephane Perrin, Nicolas Passilly, Luc Froehly, Sylwester Bargiel, Jorge Albero, Christophe Gorecki

Proceedings Volume 9132, 913216 (2014) https://doi.org/10.1117/12.2051122

KEYWORDS: 3D metrology, Optical components, Objectives, Imaging systems, Point spread functions, Microscopes, Cameras, Microlens, CMOS cameras, High dynamic range imaging

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Proceedings Article | 1 May 2014 Paper

Optical design of a vertically integrated array-type Mirau-based OCT system

J. Krauter, T. Boettcher, W. Lyda, W. Osten, N. Passilly, L. Froehly, S. Bargiel, J. Albero, S. Perrin, J. Lullin, C. Gorecki

Proceedings Volume 9132, 91320L (2014) https://doi.org/10.1117/12.2054573

KEYWORDS: Optical coherence tomography, Interferometers, Optical design, Skin, Beam splitters, Sensors, Cameras, Imaging systems, Electroluminescent displays, Tissue optics

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Proceedings Article | 14 May 2010 Paper

Integrated three-dimensional scanner for endoscopic optical coherence tomography

Khaled Aljasem, Luc Froehly, Hans Zappe, Andreas Seifert

Proceedings Volume 7716, 77162P (2010) https://doi.org/10.1117/12.851644

KEYWORDS: Optical coherence tomography, Mirrors, 3D scanning, Endoscopy, Micromirrors, 3D image processing, Collimation, Laser scanners, Silicon, Aluminum

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Proceedings Article | 14 April 2006 Paper

Real-time optical coherence spectrotomography: proof of principle

L. Froehly, M. Ouadour, G. Petitjean, L. Furfaro, P. Sandoz, T. Gharbi, P. Leproux, G. Huss, V. Couderc

Proceedings Volume 6191, 61910N (2006) https://doi.org/10.1117/12.661739

KEYWORDS: Optical coherence tomography, Spectroscopy, Spectral resolution, Sensors, Diffraction gratings, Signal processing, Absorption, Light sources, Interferometers, Optical correlators

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Proceedings Article | 1 September 2005 Paper

Wavelength multiplexed spectral interferometry for endoscopic topographic imaging

L. Froehly, A. Bachmann, T. Lasser, C. Depeursinge, F. Lang

Proceedings Volume 5864, 586406 (2005) https://doi.org/10.1117/12.632911

KEYWORDS: Computer programming, Diffraction gratings, Interferometry, Endoscopy, Wavelets, Multiplexing, Diffraction, Imaging systems, Optical coherence tomography, Single mode fibers

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Proceedings Article | 13 April 2005 Paper

Continuous wavelet transform ridge extraction for spectral interferometry imaging

Michael Liebling, Thierry-Francois Bernhard, Adrian Bachmann, Luc Froehly, Theo Lasser, Michael Unser

Proceedings Volume 5690, (2005) https://doi.org/10.1117/12.591440

KEYWORDS: Continuous wavelet transforms, Computer programming, Interferometry, Multiplexing, Single mode fibers, Wavelets, Wavelet transforms, Fourier transforms, Charge-coupled devices, Biomedical optics

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Showing 5 of 19 publications

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