Dr. Jean-Bernard Lecourt Profile

Dr. Jean-Bernard Lecourt

researcher at Multitel ASBL

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Author

Publications (16)

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 | 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 | 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

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 | 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-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 | 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 | 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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Showing 5 of 16 publications

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