Dr. Yves Hernandez Profile

Dr. Yves Hernandez

Group Leader/Applied Photonics at Multitel ASBL

SPIE Involvement:

Author

Publications (31)

Proceedings Article | 17 March 2023 Presentation + Paper

kW-level USP lasers for high-rate drilling of airplane structures

Emeric Biver, Alexandre Vendramini, Julien Pouysegur, Julien Dupuy, Anne Henrottin, Yves Hernandez, Roberto Ocaña

Proceedings Volume 12409, 124090W (2023) https://doi.org/10.1117/12.2653227

KEYWORDS: Laser drilling, Beam path, Titanium, Femtosecond phenomena, Vacuum chambers, Prototyping, Diffractive optical elements, Beam diameter, Scanners, High power lasers, Beam splitters, Industrial applications

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Proceedings Article | 17 March 2023 Presentation + Paper

Advanced USP laser process with deep learning and triangular beam shaping for micro Fresnel lenses fabrication

Alexandre Miazek, Julien Dupuy, Ivan Gusachenko, Gwenn Pallier, Yves Hernandez

Proceedings Volume 12408, 1240802 (2023) https://doi.org/10.1117/12.2649063

KEYWORDS: Data modeling, Laser ablation, Beam shaping, Fresnel lenses, Ablation, Laser processing, Deep learning, Databases, Neural networks

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Proceedings Article | 25 May 2022 Presentation + Paper

Study of periodic amplitude fluctuations in a mode-lock Ytterbium fiber laser delivering 1 MHz pulse train

Simon Boivinet, Jean-Bernard Lecourt, Yves Hernandez

Proceedings Volume 12142, 121420P (2022) https://doi.org/10.1117/12.2621645

KEYWORDS: Mode locking, Fiber lasers, Mirrors, Reflectivity, Amplitude modulation, Fiber Bragg gratings, Pulsed laser operation, Picosecond phenomena, Modulation, Ytterbium

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Proceedings Article | 17 May 2022 Presentation + Paper

Real-time and on-field CO2 sensing based on a fast frequency modulation OPO system

Florent Défossez, Yves Hernandez, Jean-Bernard Lecourt, Alexandre Gognau, Simon Boivinet, Raphaël Vallon, Bertrand Parvitte, Virginie Zéninari, Sylvain Brohez, Dorothée Dewaele, Fabrice Cazier, André Peremans, Laurent Lamard, Antonio Baylon

Proceedings Volume 12139, 121390V (2022) https://doi.org/10.1117/12.2621659

KEYWORDS: Optical parametric oscillators, Carbon monoxide, Modulation, Crystals, Quantum cascade lasers, Spectroscopy, Calibration, Nonlinear crystals, Fabry–Perot interferometers, Absorption

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Proceedings Article | 19 July 2019 Paper

A compact multichannel spectrometer for label-free monitoring of biochips for point-of-care testing

Fabian Dortu, Hendrik Von Horsten, Damien Bernier, Maxime Denti, Ana Hernandez, Rafael Casquel, Miguel Holgado, Theo Veenstra, Paula Ciaurriz, Edurne Tellechea, Fátima Fernandez, Iñaki Cornago, María Maigler, Jean-Pierre Vilcot, Sophie Maricot, Jurij Hastanin, Cédric Lenaerts, Aline Roobroek, Sylvain Deprez, Yves Hernandez

Proceedings Volume 11073, 1107314 (2019) https://doi.org/10.1117/12.2526953

KEYWORDS: Spectroscopy, Transducers, Sensors, Point-of-care devices, CMOS sensors, Biomedical optics, Microrings, Resonators, Signal processing

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Proceedings Article | 7 March 2019 Presentation + Paper

Fast tunable Mid-IR source pumped by a picosecond fiber laser

Chems-Eddine Ouinten, Florent Défossez, Alexandre Gognau, Yves Hernandez, Jean-Bernard Lecourt, Raphaël Vallon, Bertrand Parvitte , Virginie Zéninari, Laurent Lamard, André Peremans

Proceedings Volume 10896, 1089602 (2019) https://doi.org/10.1117/12.2507871

KEYWORDS: Optical parametric oscillators, Fiber lasers, Picosecond phenomena, Fiber Bragg gratings, Mid-IR, Spectroscopy, Modulation, Absorption, Methane, Optical amplifiers

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Proceedings Article | 7 March 2019 Presentation + Paper

Burst picosecond hybrid fiber/crystal laser for LIPSS processing

Jean-Bernard Lecourt, Jérôme Hily, Alexandre Gognau, Julien Dupuy, Chems-Eddine Ouinten, Yves Hernandez

Proceedings Volume 10896, 108960P (2019) https://doi.org/10.1117/12.2507875

KEYWORDS: Picosecond phenomena, Optical amplifiers, Fiber amplifiers, Fiber lasers, Oscillators, Nonlinear crystals, Crystals, Laser processing, Laser crystals, Bragg cells

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Proceedings Article | 4 March 2019 Presentation + Paper

Switchable dual wavelength picosecond fiber laser source operating around 780 nm for advanced Raman spectroscopy

Jean-Bernard Lecourt, Fabian Dortu, Chems-Eddine Ouinten, Yves Hernandez

Proceedings Volume 10908, 109080M (2019) https://doi.org/10.1117/12.2507882

KEYWORDS: Fiber Bragg gratings, Raman spectroscopy, Picosecond phenomena, Fiber lasers, Second-harmonic generation, Oscillators, Pulsed laser operation, Fiber amplifiers, Optical filters, Luminescence

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Proceedings Article | 27 February 2019 Paper

Comparison between laser thermal effects and ablation effects with ultrashort pulses laser on GO SiFe electrical steel

Julien Dupuy, Nesser Manar, Olivier Maloberti, Yves Hernandez

Proceedings Volume 10911, 1091104 (2019) https://doi.org/10.1117/12.2505326

KEYWORDS: Magnetism, Laser ablation, Thermal effects, Pulsed laser operation, Laser processing, Femtosecond phenomena, Continuous wave operation, Coating

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Proceedings Article | 24 May 2018 Paper

Terahertz hyper-spectral imaging of lab-prepared versus commercial paracetamol tablets and potential applications

D. Nguyen, F. Dortu, A. Dispa, Ph. Hubert, E. Ziemons, Y. Hernandez

Proceedings Volume 10677, 106773I (2018) https://doi.org/10.1117/12.2307648

KEYWORDS: Terahertz radiation, Tablets, Absorption, Imaging spectroscopy, Spectroscopy, Packaging, Chemical analysis, Modulation transfer functions, Hyperspectral systems, Biological research

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Proceedings Article | 23 May 2018 Presentation

High energy, femtosecond fiber laser source at 1750 nm for 3-photon microscopy (Conference Presentation)

Andreas Wienke, Dieter Wandt, Jean-Bernard Lecourt, Didier Lekime, Yves Hernandez, Jörg Neumann, Dietmar Kracht

Proceedings Volume 10683, 106831T (2018) https://doi.org/10.1117/12.2307467

KEYWORDS: Microscopy, Femtosecond fiber lasers, Phase modulation, Fiber amplifiers, Wavelength division multiplexing, Fiber lasers, Imaging systems, Laser systems engineering, Polarization, Oscillators

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We present an ultrafast fiber laser system at a central wavelength of 1750 nm for imaging applications, in particular 3-photon microscopy. It generates an output pulse train with an adjustable repetition rate ranging from 1 MHz to 21 MHz. After temporal compression the pulse duration is 220 fs and the maximum achieved pulse energy is 20 nJ. The laser system consists of a polarization maintaining (PM) Erbium-doped fiber oscillator which emits a stable output pulse train at a fixed repetition rate of 42 MHz. The oscillator generates soliton pulses centered at a wavelength of 1560 nm and a spectral width of 7 nm. Mode-locking is initiated and stabilized by a semiconductor saturable absorber mirror. The output pulses are picked in a PM fiber coupled acousto-optic modulator to an adjustable repetition rate of 1 – 21 MHz. A consecutive Erbium-doped PM fiber amplifier (EDFA) boosts the energy of the soliton pulses from pJ to nJ level. The directly emitted pulses have a duration of 2 ps which can be compressed to a pulse duration of 115 fs by using a passive standard fiber. The uncompressed pulses are soliton-self-frequency shifted by Raman scattering to wavelengths longer than 1700 nm in 7 m of passive PM1550 fiber at a pulse energy of 1.1 nJ. The central wavelength can be adjusted by the pump power of the EDFA. To boost the pulse energy of the wavelength shifted pulses, the Raman stage is followed by a single-clad Thulium-doped fiber (TDF) amplifier. It consists of a 1560/1750 nm wavelength division multiplexer (WDM) and 0.9 m of TDF. To diminish nonlinear effects during amplification, the pulses are stretched with 25 m of normal dispersion fiber (NDF) inserted between the WDM and the TDF. Although on the very short wavelength amplification band, the pulses are amplified up to more than 40 nJ of pulse energy at an injected pump power of 4.1 W. After the fiber amplifier, the pulses are coupled out and propagate through a spectral filter, a triplet of l/4, l/2, and l/4 waveplates, an isolator, and a grating compressor. As the WDM, NDF, and TDF are not PM, the polarization state has to be readjusted to linear with the waveplates before entering the isolator. The added group delay dispersion of 2.17 ps2 by the NDF is compensated in a free space standard grating compressor built of two 600 lines/mm gratings. The transmission of the grating compressor is 60 %. To achieve optimum compression to a pulse duration of 220 fs at a pulse energy of 20 nJ, the compressor in combination with spectral filtering around 1750 nm has to be carefully adjusted. The maximum output pulse energy of 20 nJ is constant ranging from 1 MHz to 7 MHz, but is reduced at higher repetition rates down to 8.7 nJ. The output pulse duration is nearly constant at 220 fs for all repetition rates. Further amplification of the pulses is currently under investigation. This system will be used in future for the application of 3-photon microscopy.

Proceedings Article | 17 May 2018 Paper

High-power picosecond fiber-based laser operating at 515 nm

Jean-Bernard Lecourt, Sébastien Guillemet, Julien Dupuy, Alexandre Gognau, Yves Hernandez

Proceedings Volume 10683, 1068338 (2018) https://doi.org/10.1117/12.2307471

KEYWORDS: Picosecond phenomena, Fiber amplifiers, Fiber lasers, Optical amplifiers, Second-harmonic generation, Oscillators, Fiber Bragg gratings, Crystals, Nonlinear crystals, Mode locking

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Proceedings Article | 17 May 2018 Presentation + Paper

Two photon microscopy with a 1064 nm femtosecond fiber laser

Jean-Bernard Lecourt, Alexandre Gognau, Yves Hernandez

Proceedings Volume 10683, 106831Q (2018) https://doi.org/10.1117/12.2307463

KEYWORDS: Fiber amplifiers, Microscopes, Two photon excitation microscopy, Picosecond phenomena, Oscillators, Fiber lasers, Optical amplifiers, Femtosecond fiber lasers, Femtosecond phenomena

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Proceedings Article | 12 May 2015 Paper

High-energy picosecond hybrid fiber/crystal laser for thin films solar cells micromachining

Jean-Bernard Lecourt, Simon Boivinet, Anthony Bertrand, Didier Lekime, Yves Hernandez

Proceedings Volume 9513, 951303 (2015) https://doi.org/10.1117/12.2180234

KEYWORDS: Picosecond phenomena, Fiber amplifiers, Optical amplifiers, Phase modulation, Oscillators, Fiber lasers, Pulsed laser operation, Amplifiers, Micromachining, Neodymium lasers

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Proceedings Article | 4 March 2015 Paper

Impact of chromatic dispersion and spectral filtering in an all-fiber mode-locked ytterbium laser

S. Boivinet, J.-B. Lecourt, Y. Hernandez, A. Fotiadi, M. Wuilpart, P. Mégret

Proceedings Volume 9344, 934421 (2015) https://doi.org/10.1117/12.2078865

KEYWORDS: Fiber Bragg gratings, Dispersion, Picosecond phenomena, Mode locking, Optical filters, Phase modulation, Fiber lasers, Polarizers, Pulsed laser operation, Polarization

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Proceedings Article | 1 May 2014 Paper

Mid-infrared resonant ablation for selective patterning of thin organic films

Sanjeev Naithani, Charles Duterte, Marieta Levichkova, Arnaud Grisard, David Schaubroeck, Eric Lallier, Yves Hernandez, Karsten Walzer, Geert Van Steenberge

Proceedings Volume 9135, 91350K (2014) https://doi.org/10.1117/12.2052763

KEYWORDS: Absorption, Thin films, Mid-IR, Optical lithography, Laser ablation, Positron emission tomography, Picosecond phenomena, Glasses, Scanning electron microscopy, Photomicroscopy

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The fast growing market of organic electronics, including organic photovoltaics (OPV), stimulates the development of versatile technologies for structuring thin-film materials. Ultraviolet lasers have proven their full potential for patterning single organic layers, but in a multilayer organic device the obtained layer selectivity is limited as all organic layers show high UV absorption. In this paper, we introduce mid-infrared (IR) resonant ablation as an alternative approach, in which a short pulse mid-infrared laser can be wavelength tuned to one of the molecular vibrational transitions of the organic material to be ablated. As a result, the technique is selective in respect of processing a diversity of organics, which usually have different infrared absorption bands. Mid-IR resonant ablation is demonstrated for a variety of organic thin films, employing both nanosecond (15 ns) and picosecond (250 ps) laser pulses tunable between 3 and 4 microns. The nanosecond experimental set-up is based on a commercial laser at 1064 nm pumping a singly resonant Optical Parametric Oscillator (OPO) built around a Periodically-Poled Lithium Niobate (PPLN) crystal with several Quasi-Phase Matching (QPM) periods, delivering more than 0.3 W of mid-IR power, corresponding to 15 μJ pulses. The picosecond laser set-up is based on Optical Parametric Amplification (OPA) in a similar crystal, allowing for a comparison between both pulse length regimes. The wavelength of the mid-infrared laser can be tuned to one of the molecular vibrational transitions of the organic material to be ablated. For that reason, the IR absorption spectra of the organic materials used in a typical OPV device were characterized in the wavelength region that can be reached by the laser setups. Focus was on OPV substrate materials, transparent conductive materials, hole transport materials, and absorber materials. The process has been successfully demonstrated for selective thin film patterning, and the influence of the various laser parameters is discussed.

Proceedings Article | 1 May 2014 Paper

948 kHz repetition rate, picosecond pulse duration, all-PM 1.03 µm mode-locked fiber laser based on nonlinear polarization evolution

S. Boivinet, J.-B. Lecourt, Y. Hernandez, A. Fotiadi, P. Mégret

Proceedings Volume 9135, 91351I (2014) https://doi.org/10.1117/12.2052108

KEYWORDS: Mode locking, Picosecond phenomena, Mirrors, Polarization, Pulsed laser operation, Phase modulation, Fermium, Frequency modulation, Fiber lasers, Polarizers

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Proceedings Article | 29 November 2012 Paper

Ultra-fast ytterbium fiber laser operating at low repetition rate

Jean-Bernard Lecourt, Simon Boivinet, Yves Hernandez

Proceedings Volume 8551, 85510A (2012) https://doi.org/10.1117/12.2001295

KEYWORDS: Optical filters, Picosecond phenomena, Fiber lasers, Mode locking, Phase modulation, Fiber Bragg gratings, Pulsed laser operation, Ultrafast phenomena, Electronic filtering, Dispersion

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Proceedings Article | 9 May 2012 Paper

Comparison of different wavelength pump sources for Tm subnanosecond amplifier

Andras Cserteg, Sébastien Guillemet, Yves Hernandez, Domenico Giannone

Proceedings Volume 8433, 843304 (2012) https://doi.org/10.1117/12.922321

KEYWORDS: Thulium, Absorption, Fiber lasers, Scanning probe microscopy, Fiber amplifiers, Amplifiers, Erbium, Optical amplifiers, Raman spectroscopy, Oscillators

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Proceedings Article | 9 May 2012 Paper

Efficient high-power narrow-linewidth all-fibred linearly polarized ytterbium laser source

Anthony Bertrand, Flavien Liégeois, Yves Hernandez, Domenico Giannone

Proceedings Volume 8433, 84330F (2012) https://doi.org/10.1117/12.922311

KEYWORDS: Oscillators, Mode locking, Phase modulation, Picosecond phenomena, Ytterbium, Fiber amplifiers, Optical amplifiers, High power lasers, Optical fibers, Scanning probe microscopy

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Proceedings Article | 2 May 2012 Paper

Investigation of CIS/CIGS and CdTe solar cells scribing with high-power fibre short pulse lasers

Yves Hernandez, Erwin Lotter, Veronica Bermudez, Alessio Bosio, François Salin, Marc Hueske, Stefano Selleri, Anthony Bertrand, Charles Duterte

Proceedings Volume 8438, 84380U (2012) https://doi.org/10.1117/12.922562

KEYWORDS: Picosecond phenomena, Solar cells, Copper indium gallium selenide, Resistance, Fiber lasers, Optical amplifiers, Fiber amplifiers, Pulsed laser operation, Remote sensing, Molybdenum

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Proceedings Article | 2 May 2012 Paper

Laser thermoreflectance for semiconductor thin films metrology

P. Gailly, J. Hastanin, C. Duterte, Y. Hernandez, J.-B. Lecourt, A. Kupisiewicz, P.-E. Martin, K. Fleury-Frenette

Proceedings Volume 8438, 84381F (2012) https://doi.org/10.1117/12.922576

KEYWORDS: Thin films, Semiconductor lasers, Pulsed laser operation, Temperature metrology, Finite-difference time-domain method, Metrology, Reflectivity, Nickel, Semiconductors, Thin film solar cells

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Proceedings Article | 16 February 2012 Paper

High pulse energy sub-nanosecond Tm-doped fiber laser

Andras Cserteg, Sebastien Guillemet, Yves Hernandez, Domenico Giannone

Proceedings Volume 8237, 82373V (2012) https://doi.org/10.1117/12.908115

KEYWORDS: Fiber lasers, Thulium, Picosecond phenomena, Fiber amplifiers, Oscillators, Crystals, Amplifiers, Absorption, Gallium arsenide, Laser crystals

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Proceedings Article | 16 February 2012 Paper

High-power ultrashort fiber laser for solar cells micromachining

J.-B. Lecourt, C. Duterte, F. Liegeois, D. Lekime, Y. Hernandez, D. Giannone

Proceedings Volume 8237, 823738 (2012) https://doi.org/10.1117/12.907951

KEYWORDS: Optical amplifiers, Picosecond phenomena, Laser ablation, Fiber amplifiers, Fiber lasers, Phase modulation, Micromachining, Pulsed laser operation, Oscillators, Solar cells

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Proceedings Article | 9 February 2012 Paper

Laser diodes with distributed feedback for application as subnanosecond fiber laser seeder

E. Zibik, A. Bertrand, W. Kaiser, J. Boucart, A. Thies, I. Davies, D. Inder, C. Button, Y. Hernandez, N. Lichtenstein

Proceedings Volume 8277, 82771O (2012) https://doi.org/10.1117/12.909054

KEYWORDS: Fiber lasers, Pulsed laser operation, Modulation, Semiconductor lasers, Picosecond phenomena, Fiber amplifiers, Laser stabilization, Laser systems engineering, Laser development, Continuous wave operation

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Proceedings Article | 21 February 2011 Paper

Recent status and prospects of the EU-funded ALPINE project

Stefano Selleri, Annamaria Cucinotta, Federica Poli, Enrico Coscelli, Davide Passaro, Lasse Leick, Yves Hernandez, Veronica Bermudez, Evgeny Zibik, Norbert Lichtenstein, Erwin Lotter, Alessio Bosio, Davide Polverini

Proceedings Volume 7921, 79210S (2011) https://doi.org/10.1117/12.873734

KEYWORDS: Solar cells, Fiber lasers, Thin films, Copper indium disulfide, Thin film solar cells, Photovoltaics, Laser development, Solar energy, Manufacturing, Laser processing

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Proceedings Article | 19 May 2010 Paper

High repetition rate, high energy, actively Q-switched all-in-fiber laser

J. Lecourt, A. Bertrand, S. Guillemet, Y. Hernandez, D. Giannone

Proceedings Volume 7721, 772108 (2010) https://doi.org/10.1117/12.854200

KEYWORDS: Pulsed laser operation, Bragg cells, Oscillators, Fiber amplifiers, Optical amplifiers, Q switched lasers, Fiber lasers, Raman scattering, Fiber Bragg gratings, Laser resonators

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Proceedings Article | 14 May 2010 Paper

Adjustable supercontinuum laser source with low coherence length and low timing jitter

Marco Andreana, Anthony Bertrand, Yves Hernandez, Philippe Leproux, Vincent Couderc, Stéphane Hilaire, Guillaume Huss, Domenico Giannone, Alessandro Tonello, Alexis Labruyère, Nelly Rongeat, Philippe Nérin

Proceedings Volume 7714, 771404 (2010) https://doi.org/10.1117/12.854237

KEYWORDS: Picosecond phenomena, Micro optical fluidics, Semiconductor lasers, Laser sources, Pulsed laser operation, Modulation, Fiber lasers, Amplifiers, Infrared radiation, Diodes

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Proceedings Article | 18 November 2008 Paper

Pulsed 1.55μm all-fiber laser combining high energy, ultranarrow linewidth and optimal spatial beam quality

Flavien Liégeois, Yves Hernandez, Damien Kinet, Domenico Giannone, Thierry Robin, Benoît Cadier

Proceedings Volume 7138, 713807 (2008) https://doi.org/10.1117/12.817971

KEYWORDS: Fiber lasers, Pulsed laser operation, LIDAR, Doppler effect, Optical filters, Modulation, Erbium, Laser sources, Oscillators, Optical amplifiers

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Proceedings Article | 22 April 2008 Paper

Impact of pumping configuration on all-fibered femtosecond chirped pulse amplification

Jean-Bernard Lecourt, Charles Duterte, Anthony Bertrand, Flavien Liégeois, Yves Hernandez, Domenico Giannone

Proceedings Volume 6998, 69980F (2008) https://doi.org/10.1117/12.781000

KEYWORDS: Scanning probe microscopy, Picosecond phenomena, Optical amplifiers, Raman scattering, Second-harmonic generation, Multiplexers, Femtosecond phenomena, Dispersion, Nonlinear optics, Fiber amplifiers

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Proceedings Article | 3 October 2006 Paper

Pulsed high-peak-power and single-frequency fibre laser design for LIDAR aircraft safety application

Flavien Liégeois, Clément Vercambre, Yves Hernandez, Mohamed Salhi, Domenico Giannone

Proceedings Volume 6367, 63670H (2006) https://doi.org/10.1117/12.688203

KEYWORDS: Fiber lasers, Optical amplifiers, LIDAR, Optical filters, Pulsed laser operation, Laser development, Doppler effect, Wind energy, Safety, Modulation

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Showing 5 of 31 publications

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