Explanipedia

High-energy soliton frequency shifting in a nitrogen-filled multipass cell Open

Giovanni Cichelli, Gautier Parize, Michele Natile, Xavier Délen, Florent Guichard , et al. · 2025

We report an experimental demonstration of soliton self-frequency shift in a nitrogen-filled multipass cell. The use of a molecular gas combined with the flexible geometry of the multipass platform enables efficient wavelength conversion f…

Indirectly LED-pumped Nd:glass regenerative amplifier Open

Maxime Nourry-Martin, Catherine Le Blanc, L. Meignien, P. Audebert, Frédéric Druon , et al. · 2025

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Cr:ZnSe as a luminescent concentrator Open

Lisa Lopez, Hussein Taleb, Maxime Nourry-Martin, Frédéric Druon, Sophie Coumar , et al. · 2025

We demonstrate the first Cr:ZnSe luminescent concentrator. Enhanced by amplified spontaneous emission, it has the best efficiency ever reported for luminescent concentrators emitting in the SWIR band. It emits an output power of 1.6 W and …

Numerical and experimental study of self-seeded stimulated Brillouin scattering in active fibers injected by a sinusoidally phase modulated signal Open

Jonathan Pouillaude, Louise Esberard, Pierre Pichon, Anasthase Liméry, Xavier Délen , et al. · 2025

Sinusoidal phase modulation is a simple technique for increasing the SBS threshold by an enhancement factor (EF) of 3 to 10 in fiber-based laser systems. However, this EF can be reduced by a factor of ∼2 if modulation settings are not care…

LED pumped alexandrite multipass amplifier designed for acousto-optic imaging Open

Elio Thellier, Hussein Taleb, Frédéric Druon, Frédéric Druon, Pierre Pichon , et al. · 2025

In this paper we present an alexandrite (Cr 3+ :BeAl 2 O 4 ) multipass amplifier pumped by blue LEDs via a luminescent concentrator (LC). This emerging pump technology provides up to 2.6 kW optical pump power during 400 µs at 10 Hz in the …

Accurate pulse-to-pulse stability measurement for femtosecond lasers Open

Michele Natile, Gautier Parize, Florent Guichard, Marc Hanna, Patrick Georges · 2025

Short-term energy stability metrology of pulsed lasers is the source of widespread misleading comparisons. The most used value for this characterization in commercial products and laboratory applications is the rms pulse-to-pulse stability…

Temporal pulse shaping technique for nonlinear frequency shifting Open

Gautier Parize, Michele Natile, Florent Guichard, Antoine Comby, Marc Hanna , et al. · 2025

We present a spectral phase-only shaping technique allowing to generate arbitrary temporal shapes and demonstrate its use for ultrafast ytterbium-based laser sources. This technique is based on the introduction of a nonlinear chirp that is…

Off-resonance intracavity up-conversion pumping architecture enabling multi-watt operation of a 2.3-µm Tm:YLF laser Open

Matthieu Glasset, Hippolyte Dupont, Lauren Guillemot, Pavel Loiko, Patrice Camy , et al. · 2025

We present an intra-cavity upconversion pumping scheme for Thulium lasers operating on the 3 H 4 → 3 H 5 transition. It is based on detuning the pump wavelength from the resonance of excited-state absorption, 3 F 4 → 3 F 2,3 , around 1 µm.…

Indirectly LED-pumped Nd:glass: potential for high energy laser facilities Open

Maxime Nourry-Martin, Nicolas Fermon, Catherine Le Blanc, L. Meignien, P. Audebert , et al. · 2025

Flashlamp-pumped Nd:glass is used as a power amplifier in many high energy laser facilities. Despite the problems of this old technology, flashlamps are still being considered for the next generation of lasers as diode laser pumping is far…

Higher-order- and multimode properties of nonlinear multipass cells for temporal compression Open

Marc Hanna, Michele Natile, Florent Guichard, Gautier Parize, Xavier Délen , et al. · 2025

Over the last few years, temporal compression in nonlinear multipass cells (MPCs) has been proven to be a very promising method for future ultrafast laser sources. Although the majority of the work has been done with Gaussian beams, a few …

Type-I intermittency route to the chaos in passively Q-switched Tm:YLF laser emitting at 2.3 μm Open

Frédéric Druon, Matthieu Glasset, Patrick Georges, Hippolyte Dupont · 2025

We report on an original chaotic dynamic behavior of a Tm-doped Q-switched laser operating on the 3 H 4 → 3 H 5 transition emitting at 2.3 μm using a Tm:YLF crystal, with optional co-lasing at 1.9 μm via the ³F₄ → ³H₆ transition. This stud…

Real-time acousto-optic imaging using high-peak-power long-pulsed illumination Open

François Figliolia, Qin Liu, Sylvie Janicot, Patrick Georges, Gaëlle Lucas-Leclin , et al. · 2024

Acousto-optic imaging (AOI) of absorbing objects embedded in highly scattering media remains challenging, since the detectable signal suitable for image reconstruction is weak. To increase the detected signals to a level required by live b…

Chaotic dynamics in passively Q-switched Tm:LiYF4 laser operating at 2.3 μm on the 3H4 → 3H5 transition Open

Hippolyte Dupont, Matthieu Glasset, Pavel Loiko, Patrick Georges, Frédéric Druon · 2024

We report on the chaotic dynamics in a passively Q-switched 2.3-μm thulium laser operating on the 3H4 → 3H5 transition. The experiment exploits a Tm:LiYF4 crystal and various laser cavity configurations, involving an optional cascade laser…

High-power 2.3 µm Tm:YLF laser with intracavity upconversion pumping by a Nd:ASL laser at 1051 nm Open

Hippolyte Dupont, Timothée Lenfant, Lauren Guillemot, Pavel Loiko, Xavier Délen , et al. · 2024

A Tm:LiYF 4 laser operating on the 3 H 4 → 3 H 5 transition is embedded in a high-power diode-pumped Nd:ASL laser for intracavity upconversion pumping at 1.05 µm. This leads to a record-high output power at 2.3 µm for any bulk thulium lase…

CTH:YAG : from laser medium to luminescent concentrator Open

Lisa Lopez, Pierre Pichon, Frédéric Druon, Sophie Coumar, Clément Oriol , et al. · 2024

This work presents what we believe is a new way to use a CTH:YAG crystal for spontaneous emission instead of laser emission. The spontaneous emission is collected in one main direction thanks to a luminescent concentrator configuration. Th…

Chirped pulse upconversion for femtosecond mid-infrared spectroscopy at 100 kHz Open

Mindaugas Jonušas, Quentin Bournet, Adeline Bonvalet, Michele Natile, Florent Guichard , et al. · 2024

We demonstrate that chirped pulse up-conversion (CPU), a method routinely used with systems based on 1-kHz Titanium:Sapphire lasers, can be extended to a repetition rate of 100 kHz with an Ytterbium diode-pumped femtosecond amplifier. Indi…

Maximizing the efficiency of intrapulse difference frequency generation by pulse shaping and recycling Open

Quentin Bournet, M. Jonusas, Florent Guichard, Michele Natile, Yoann Zaouter , et al. · 2024

Type-I intermittency route to chaos in passively Q-switched Tm:YLF laser emitting at 2.3 μm Open

Hippolyte Dupont, Matthieu Glasset, Pavel Loiko, Patrick Georges, Frédéric Druon · 2024

We report on an original chaotic dynamic behaviour of a passively Q-switched 2.3-μm Thulium laser operating on the 3 H 4 → 3 H 5 transition. The experiment employs a Tm:LiYF 4 laser crystal within various laser cavity configurations, invol…

Experimental demonstration of a temporal pulse shaping method based on nonlinear chirp Open

Gautier Parize, Michele Natile, Florent Guichard, Antoine Comby, Marc Hanna , et al. · 2024

We present a general temporal shaping method based on spectral phase-only modulation for ultrafast laser sources. We explain the working principle of this technique and use it experimentally to generate a ramp-shaped pulse at the output of…

High-power intracavity upconversion pumped Tm:YLF laser emitting at 2.3 μm Open

Hippolyte Dupont, Timothée Lenfant, Lauren Guillemot, Xavier Délen, Pavel Loiko , et al. · 2024

A Tm:LiYF4 laser operating on the 3 H 4 → 3 H 5 transition is integrated into a high-power diode-pumped Nd:ASL laser for intracavity upconversion pumping at 1.05 μm. This architecture leads to a record-high output power at 2.3 μm ever extr…

Power scaling of LED-pumped alexandrite: The road to high gain multipass amplifiers Open

Elio Thellier, Hussein Taleb, C. Le Blanc, Pierre Pichon, Frédéric Druon , et al. · 2024

Our experiment demonstrates that LED-pumping through luminescent concentrator enables sufficient pump power for viable alexandrite amplifier gain. In 10 passes we obtain a gain of 19 with 10 W output power, for 50 µs pulses at 20 Hz and 76…

Nonlinear post-compression of a hybrid vortex mode in a gas-filled capillary Open

Mekha Vimal, Michele Natile, Jean-François Lupi, Florent Guichard, D. Descamps , et al. · 2023

We demonstrate nonlinear temporal compression of a vortex beam by propagation in a gas-filled capillary. Starting from an ytterbium-based laser delivering 700 μ J 640 fs pulses at a 100 kHz repetition rate, the vortex beam is generated usi…

On the efficiency of Intrapulse Difference Frequency Generation MIR systems Open

Quentin Bournet, M. Jonusas, Florent Guichard, Michele Natile, Yoann Zaouter , et al. · 2023

Intrapulse Difference Frequency Generation (iDFG) is an interesting technique for generating femtosecond pulses in the Mid-Infrared (MIR) range with unique properties such as robust Carrier-Envelope Phase (CEP) stability. However, its effi…

Cascade laser optimization for 3H4 → 3H5 and 3F4 → 3H6 sequent transitions in Tm3+-doped materials Open

Hippolyte Dupont, Lauren Guillemot, Pavel Loiko, Rosa Maria Solé, Xavier Mateos , et al. · 2023

We study a cascade laser scheme involving the 3 H 4 → 3 H 5 and 3 F 4 → 3 H 6 consecutive transitions in Tm 3+ -doped materials as a promising technique to favor laser emission at 2.3 µm. We examine the conditions in terms of the Tm 3+ dop…

Pulsewidth-switchable ultrafast source at 114 nm Open

Anahita Omoumi, Michele Natile, E. Papalazarou, Yoann Zaouter, T. Auguste , et al. · 2023

Femtosecond laser sources with high repetition rate in the ultraviolet (UV) and vacuum UV (VUV) are fundamental tools enabling tabletop time-resolved and angle-resolved photoemission spectroscopy in solids. We describe a VUV source at 114 …

Pump tunable mirrorless OPO: an innovative concept for future space IPDA emitters Open

Kjell Martin Mølster, Marie Guionie, Patrick Mutter, Jean-Baptiste Dherbecourt, Jean-Michel Melkonian , et al. · 2023

A highly efficient mirrorless OPO tunable in the mid-infrared around 2 µm has been developed and characterized in an original pumping configuration comprising a tunable high power hybrid Ytterbium laser MOPA (Master Oscillator Power Amplif…

LED-pumped Er:Cr:YSGG light sources Open

Lisa Lopez, Frédéric Druon, Patrick Georges, François Balembois · 2023

For, what we believe is, the first time, an Er:Cr:YSGG crystal is pumped by LEDs through a Ce:YAG luminescent concentrator. We demonstrate both laser emission at 2.79 µm and strong spontaneous emission at 1.6 µm. The luminescent concentrat…

Ce:LYSO, from scintillator to solid-state lighting as a blue luminescent concentrator Open

Lisa Lopez, Pierre Pichon, Pascal Loiseau, Bruno Viana, R. Mahiou , et al. · 2023

Cerium-doped lutetium-yttrium oxyorthosilicate (Ce:LYSO) is a well-known single crystal scintillator used in medical imaging and security scanners. Recent development of high power UV LED, matching its absorption band, questions the possib…

Tm:CALGO lasers at 2.32 µm: cascade lasing and upconversion pumping Open

Hippolyte Dupont, Pavel Loiko, Aleksey Tyazhev, Luidgi Giordano, Zhongben Pan , et al. · 2023

We report on the first laser operation of a disordered Tm:CaGdAlO 4 crystal on the 3 H 4 → 3 H 5 transition. Under direct pumping at 0.79 µm, it generates 264 mW at 2.32 µm with a slope efficiency of 13.9% and 22.5% vs. incident and absorb…

Intensity noise in difference frequency generation-based tunable femtosecond MIR sources Open

Quentin Bournet, Marta Maria Natile, M. Jonusas, F. Guichard, Yoann Zaouter , et al. · 2023

We characterize the intensity noise of two mid-infrared (MIR) ultrafast tunable (3.5-11 μ m) sources based on difference frequency generation (DFG). While both sources are pumped by a high repetition rate Yb-doped amplifier delivering 200 …

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