F. Billard

Laboratoire Interdisciplinaire Carnot de Bourgogne

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O. Faucher

Université de Bourgogne

E. Hertz

Centre National de la Recherche Scientifique

B. Lavorel

Centre National de la Recherche Scientifique

Pierre Béjot

Laboratoire Interdisciplinaire Carnot de Bourgogne

Hervé Rigneault

Institut Fresnel

G. Karras

Science and Technology Facilities Council

D. Gachet

Alpes Lasers (Switzerland)

Ilya Sh. Averbukh

Weizmann Institute of Science

C. Boulet

Centre National de la Recherche Scientifique

Bertrand Kibler

Laboratoire Interdisciplinaire Carnot de Bourgogne

Cooperative Institutions

Centre National de la Recherche Scientifique

109

Laboratoire Interdisciplinaire Carnot de Bourgogne

Université de Bourgogne

Université Bourgogne Franche-Comté

Institut Fresnel

Commissariat à l'Énergie Atomique et aux Énergies Alternatives

Aix-Marseille Université

Centrale Marseille

École Polytechnique

Université Paris-Saclay

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Coherent anti-Stokes Raman scattering (CARS) microscopy imaging at interfaces: evidence of interference effects

Optics Express (2007)

D. Gachet F. Billard Nicolas Sandeau Hervé Rigneault

We show in this paper that the contrast of the interface between resonant and nonresonant media imaged in Coherent anti-Stokes Raman scattering (CARS) microscopy strongly depends on the pump and Stokes fields spectral detuning. More specifically, when this detuning drives the vibrational resonance with the maximum phase difference, a spatial dip appears at the interface in the CARS image. This effect is studied both theoretically and experimentally and is an evidence of the coherent and resonant nature of the CARS contrast mechanism.

Coherent backscattering

Spatial frequency

10.1364/oe.15.010408

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Citations (25)

Expanding up to far-infrared filamentation-induced supercontinuum spanning in chalcogenide glasses

Applied Physics B (2018)

O. Mouawad Pierre Béjot P. Mathey Paul Froidevaux Arnaud Lemière

Supercontinuum

Filamentation

Chalcogenide glass

10.1007/s00340-018-7041-7

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Citations (10)

Observation of laser-induced field-free permanent planar alignment of molecules

Physical Review A (2011)

Md. Z. Hoque M. Lapert E. Hertz F. Billard Dominique Sugny

Permanent planar alignment of gas-phase linear molecules is achieved by a pair of delayed perpendicularly polarized short laser pulses. The experiment is performed in a supersonic jet, ensuring a relatively high number density of molecules with moderately low rotational temperature. The effect is optically probed on a femtosecond time scale by the use of a third short pulse, enabling a time-resolved birefringence detection performed successively in two perpendicular planes of the laboratory frame. The technique allows for an unambiguous estimation of the molecular planar delocalization produced within the polarization plane of the pulse pair after the turn-off of the field. The measurements are supported by numerical simulations which lead to the quantification of the observed effect and provide more physical insights into the phenomenon.

Linear molecular geometry

10.1103/physreva.84.013409

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Citations (35)

Field-free molecular alignment for probing collisional relaxation dynamics

Physical Review A (2013)

T. Vieillard Frédéric Chaussard F. Billard Dominique Sugny O. Faucher

We report the experimental study of field-free molecular alignment in CO${}_{2}$ gas mixtures induced by intense femtosecond laser pulses in the presence of collisional processes. We demonstrate that the alignment signals exhibit specific features due to nontrivial collisional propensity rules that tend to preserve the orientation of the rotational angular momentum of the molecules. The analysis is performed with a quantum approach based on the modeling of rotational $J$- and $M$-dependent state-to-state transfer rates. The present work paves the way for strong-field spectroscopy of collisional dynamics.

Dynamics

Femtochemistry

10.1103/physreva.87.023409

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Citations (48)

CARS in a microcavity

HAL (Le Centre pour la Communication Scientifique Directe) (2008)

Hervé Rigneault D. Gachet F. Billard

Source

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Citations (0)

Experimental observation of fractional echoes

Physical review. A/Physical review, A (2016)

G. Karras E. Hertz F. Billard B. Lavorel Guillaume Siour

We report the observation of fractional echoes in a double-pulse excited nonlinear system. Unlike standard echoes which appear periodically at delays which are integer multiple of the delay between the two exciting pulses, the fractional echoes appear at rational fractions of this delay. We discuss the mechanism leading to this phenomenon, and provide the first experimental demonstration of fractional echoes by measuring third harmonic generation in a thermal gas of CO2 molecules excited by a pair of femtosecond laser pulses.

Harmonic

10.1103/physreva.94.033404

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Citations (29)

Métrologie de l'indice non-linéaire dans les verres en régime nanoseconde, picoseconde et sub-picoseconde

F. Billard

To study the contribution of nonlinear effects to laser damage or predict ultrafast pulses evolution, nonlinear refractive index has to be measured accurately. To study the different contribution to nonlinear index we have implemented several sensitive measurement benches based on the Z-scan method. First, we have developed a general simulation algorithm. Thanks to it the signal obtained by this method is shown highly dependent on the spatial beam profile at the beam waist and on its evolution around the waist. Then, we present the experimental set-up including the tools needed to verify and characterize the experimental beam and reduce errors on the determination of the nonlinear index. Finally, this set-up is applied to the study of the nonlinear index of silica for different pulses durations. The nonlinear index of fused silica is found highly dependent on the pulses duration. Thermal effects are negligible and the contribution of electrostriction is important for nanosecond pulses.

Nanosecond

Source

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Citations (1)

Mid-infrared supercontinuum generation from 2 to 14 μm in arsenic- and antimony-free chalcogenide glass fibers

Journal of the Optical Society of America B (2019)

Arnaud Lemière Frédéric Désévédavy Pierre Mathey Paul Froidevaux Grégory Gadret

We demonstrate the fabrication of arsenic- and antimony-free chalcogenide glasses compatible with glass fiber processing. Optical fibers with distinct index profiles are presented and characterized, namely, single-material fibers with or without a suspended core and standard step-index fibers with varying core diameter. In addition, we evidence their potential for nonlinear photonic devices in the mid-infrared spectral region by means of supercontinuum generation experiments in the femtosecond regime. Spectral broadenings extend on several octaves in the mid-infrared from 2 to 14 μm.

Supercontinuum

Chalcogenide glass

10.1364/josab.36.00a183

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Citations (43)

Interpretation of negative birefringence observed in strong-field optical pump-probe experiments: High-order Kerr and plasma grating effects

Physical Review A (2013)

G. Karras Pierre Béjot J. Houzet E. Hertz F. Billard

The analysis of negative birefringence optically induced in major air components [Loriot et al., Opt. Express 17, 13429 (2009); Loriot et al., Opt. Express 18, 3011 (2010)] is revisited in light of the recently reported plasma grating-induced phase-shift effect predicted for strong-field pump-probe experiments [Wahlstrand and Milchberg, Opt. Lett. 36, 3822 (2011)]. The nonlinear birefringence induced by a short and intense laser pulse in argon is measured by femtosecond time-resolved polarimetry. The experiments are performed with degenerate colors, where the pump and probe beam share the same spectrum, or with two different colors and nonoverlapping spectra. The interpretation of the experimental results is substantiated using a numerical 3D+1 model accounting for nonlinear propagation effects, cross-beam geometry of the interacting laser pulses, and detection technique. The model also includes the ionization rate of argon and high-order Kerr indices introduced by Loriot et al., enabling one to assess the contribution of both terms to the observed effect. The results show that the ionization-induced phase shift has a minor contribution compared to the high-order Kerr effect formerly introduced, the latter allowing a reasonably good reproduction of the experimental data for the present conditions.

10.1103/physreva.88.053424

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Citations (4)

Generation and Control of Coherent Terahertz Phonons in Silicon Metasurfaces

Advanced Optical Materials (2022)

Renato Martins Marlène Petit Yoann Brûlé F. Billard E. Hertz

Abstract Semiconductor nanostructures are used in many applications, from electronics to nanophotonics to cite just a few, and most of these applications are based on silicon or silicon‐related technologies. With the miniaturization of these nanoscale devices, heat dissipation becomes a limitation to their efficiency, robustness, and reliability. Hence, managing thermal effects at nanoscale is attracting a growing interest and a promising approach relies on the control of acoustic phonons that are responsible of heat transfers. However, these phonons in silicon have high frequencies in the terahertz range which makes them hard to control and detect, thus limiting basic investigation and practical implementations. In this work, employing coherent control of femtosecond laser pulses and inelastic scattering spectroscopy, it is reported on the coherent generation, the control, and the detection of acoustic phonons in silicon metasurfaces in which light–matter interactions are enhanced.

Nanophotonics

Coherent control

Hybrid silicon laser

10.1002/adom.202200357

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Citations (1)