Zhao Cheng

École Nationale Supérieure de Techniques Avancées

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Rodrigo López-Martens

Centre National de la Recherche Scientifique

Jaismeen Kaur

Laboratoire d'Optique Appliquée

Aline Vernier

Laboratoire d'Optique Appliquée

J. Fauré

Institut de Recherche sur les Lois Fondamentales de l'Univers

Marie Ouillé

Laboratoire d'Optique Appliquée

Julius Huijts

Laboratoire d'Optique Appliquée

Lucas Rovige

Laboratoire d'Optique Appliquée

I. A. Andriyash

Laboratoire d'Optique Appliquée

O. Tcherbakoff

Commissariat à l'Énergie Atomique et aux Énergies Alternatives

F. Réau

Laboratoire Interactions, Dynamiques et Lasers

Cooperative Institutions

Centre National de la Recherche Scientifique

École Polytechnique

Laboratoire d'Optique Appliquée

École Nationale Supérieure de Techniques Avancées

Université Paris-Saclay

Chinese Academy of Sciences

Université Paris 1 Panthéon-Sorbonne

Huazhong University of Science and Technology

Commissariat à l'Énergie Atomique et aux Énergies Alternatives

CEA Paris-Saclay

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Towards single-cycle relativistic optics at high repetition rate

2022 International Conference Laser Optics (ICLO) (2020)

Marie Ouillé Aline Vernier D. Gustas Zhao Cheng Magali Lozano

We present a near-single-cycle near-infrared light source that can be focused to relativistic intensity at 1kHz. We observe first experimental indications of light waveform effects in laser-wakefield acceleration of relativistic energy electrons.

Single shot

Repetition (rhetorical device)

Relativistic plasma

Relativistic electron beam

10.1109/iclo48556.2020.9285587

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Relativistic-intensity near-single-cycle light waveforms at kHz repetition rate

Light Science & Applications (2020)

Marie Ouillé Aline Vernier Frederik Böhle Maïmouna Bocoum Aurélie Jullien

Abstract The development of ultra-intense and ultra-short light sources is currently a subject of intense research driven by the discovery of novel phenomena in the realm of relativistic optics, such as the production of ultrafast energetic particle and radiation beams for applications. It has been a long-standing challenge to unite two hitherto distinct classes of light sources: those achieving relativistic intensity and those with pulse durations approaching a single light cycle. While the former class traditionally involves large-scale amplification chains, the latter class places high demand on the spatiotemporal control of the electromagnetic laser field. Here, we present a light source producing waveform-controlled 1.5-cycle pulses with a 719 nm central wavelength that can be focused to relativistic intensity at a 1 kHz repetition rate based on nonlinear post-compression in a long hollow-core fiber. The unique capabilities of this source allow us to observe the first experimental indications of light waveform effects in laser wakefield acceleration of relativistic energy electrons.

Weibel instability

10.1038/s41377-020-0280-5

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Citations (83)

Demonstration of stable long-term operation of a kilohertz laser-plasma accelerator

Physical Review Accelerators and Beams (2020)

Lucas Rovige Julius Huijts I. A. Andriyash Aline Vernier Vidmantas Tomkus

We report on the stable and continuous operation of a kilohertz laser-plasma accelerator. Electron bunches with 2.6 pC charge and 2.5 MeV peak energy were generated via injection and trapping in a downward plasma density ramp. This density transition was produced in a newly designed asymmetrically shocked gas nozzle. The reproducibility of the electron source was also assessed over a period of a week and found to be satisfactory with similar values of the beam charge and energy. These results show that the reproducibility and stability of the laser-plasma accelerator are greatly enhanced on the long-term scale when using a robust scheme for density gradient injection.

10.1103/physrevaccelbeams.23.093401

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Citations (49)

Carrier-Envelope Phase Controlled Electron Dynamics in a Laser-Wakefield Accelerator

Optica High-brightness Sources and Light-driven Interactions Congress 2022 (2022)

Julius Huijts Lucas Rovige Joséphine Monzac I. A. Andriyash Aline Vernier

We report on the first observation and control of carrier-envelope phase effects in Laser Wakefield Acceleration. These effects imply the breakdown of the cycle-averaged ponderomotive approximation and are explained through highly localized off-axis electron injection.

Carrier-envelope phase

Envelope (radar)

Phase control

Dynamics

Plasma acceleration

10.1364/hilas.2022.hw6b.1

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Improvement Co2 Eletrocatalytic Activity of Lctn Fuel Electrode for Solid Oxide Electrolysis Cells Via an Electro-Reduction Activation Strategy

SSRN Electronic Journal (2022)

Ming Yin Zhao Cheng Ziling Wang Caichen Yang Jian Pu

Perovskite oxides are widely used as electrodes in solid oxide electrolytic cell (SOEC) due to their good performance and structural stability. In the meantime, surface modification can promote adsorption and activation, which will significantly improve the catalytic activity of perovskite. Herein, an electro-reduction activation strategy is attempted to activate the electrochemical activity of A-site deficiency La 0.43 Ca 0.37 Ti 0.9 Ni 0.1 O 3-γ (LCTN) perovskite as fuel electrode of SOEC for CO 2 electrolysis. The results confirm that more adsorption and activation sites can be produced on the surface of LCTN after electro-reduction treatment. Under an electro-reduction voltage of 2.8 V in N 2 , the polarization impedance of LCTN can be reduced from 0.859 to 0.208 Ω·cm 2 at 1.3 V and 800 °C for CO 2 electrolysis. And the cell with LCTN fuel electrode shows stable long-term performance for CO 2 electrolysis with a current density of 450 mA/cm 2 in nearly 100 h at 1.4 V and 800 °C. This work provides a possibility for facile and fast electrode optimization strategy for SOEC.

10.2139/ssrn.4156652

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Enhancement of laser-driven betatron x-rays by a density-depressed plasma structure

Plasma Physics and Controlled Fusion (2018)

Bo-da Guo Zhao Cheng S.C. Liu Xiaoping Ning Jie Zhang

We report a significant enhancement of betatron radiation from a laser wakefield accelerator by inserting a density-depressed plasma structure. By using a technique of transverse laser machining, a longitudinally density-depressed plasma structure with tunable length and position has been fabricated to increase the betatron amplitude of the electron beam in the laser wakefield accelerator, leading to an enhanced photon number and critical energy of the betatron X-ray beam. By adjusting the length and position of the plasma density depression region, the photon number of the betatron X-ray is enhanced by a factor of 3, and the critical energy is enhanced by a factor of 1.4.

Betatron

10.1088/1361-6587/aaf613

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High-Fidelity Few-Cycle Laser Pulses Generated Via Nonlinear Ellipse Rotation

Nikita Khodakovskiy Rodrigo López-Martens М. П. Калашников B. Mercier Viktor Pajer

Ultra-high peak-power laser systems, such as those commissioned by the ELI-ALPS European laser facility, require seed pulses with ultra-broadband spectra and high temporal contrast, which can be generated via nonlinear optical techniques, such as the widely used cross-polarized wage (XPW) generation [1]. Alternatively, Nonlinear ellipse rotation (NER) can also be used for nonlinear pulse cleaning [2]. Indeed, the intensity-dependent rotation of the polarization ellipse of an intense pulse undergoing nonlinear propagation implies that polarization discrimination can be implemented to separate the high-intensity peak from the unwanted low-intensity pedestal of the pulse. NER in noble-gas-filled hollow waveguides is particularly attractive as it can be combined with SPM-induced spectral broadening to achieve even shorter pulse duration [3,4].

Ellipse

Pulse duration

10.1109/cleoe-eqec.2019.8873203

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Wavelength-tunable passively mode-locked fiber lasers

Laser Technology (2006)

Zhao Cheng

In order to achieve special center wavelength in mode-locked fiber lasers,the experimental study of wavelength-tunable Yb~(3+)doped fiber lasers using the nonlinear optical loop mirror(NOLM) for mode-locked operating is reported.The fiber laser is self-starting easily and the operating center wavelength can be tuned from 1030nm to 1081nm.The fiber laser can generate 2.05mW average power of 234.375ps pulse duration at a repetition rate of 3.842MHz when the operating center wavelength is 1053nm and spectrum width is about 6nm.The self-starting of the mode-locked fiber laser can be achieved easily,and the mode-locked operation can be hardly influenced by the environment disturbance in days.It can produce the special center wavelength,and is to be applied in science and engineering as a center wavelength-tunable mode-locked fiber laser.

Source

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Cross-polarized wave generation in multi-pass cells

Optica High-brightness Sources and Light-driven Interactions Congress 2022 (2022)

Jaismeen Kaur Louis Daniault Zhao Cheng Jean-François Hergott F. Réau

We report on cross-polarised wave generation in multi-pass cells at the milli-Joule level. Backed by simulations, results indicate 10 3 contrast enhancement, high spatio-temporal beam quality, and a record internal conversion efficiency of 50%.

Joule (programming language)

10.1364/euvxray.2022.jth6a.2

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Optical design of a freeform f-θ lens for 405nm laser scanning unit

Applied Optics (2025)

Chen Xu Dongjie Ye Haizhou Liu Zhao Cheng Hongze Lin

Laser Scanning

10.1364/ao.551643

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