A. Lhuillier - Academia.edu (original) (raw)

Papers by A. Lhuillier

Research paper thumbnail of On the phase of atomic polarization in harmonic generation processes

Please be patient while the object screen loads. Changez de vue : Choisir un site… UCL FUNDP FUSL... more Please be patient while the object screen loads. Changez de vue : Choisir un site… UCL FUNDP FUSL FUCaM. ...

Research paper thumbnail of Attosecond pump-probe electron interferometry

We present an interferometric pump-probe technique for the characterization of attosecond electro... more We present an interferometric pump-probe technique for the characterization of attosecond electron wave packets that uses a free wave packet as a reference to measure a bound packet. We demonstrate our method by exciting helium atoms using an attosecond pulse with a bandwidth centered near the ionization threshold, thus creating both a bound and a free wave packet simultaneously. After a variable delay, the bound wave packet is ionized by a few-cycle infrared laser precisely synchronized to the original attosecond pulse. By measuring the delay-dependent photoelectron spectrum we obtain an interferogram that contains both quantum beats as well as multi-path interference. Analysis of the interferogram allows us to determine the bound wave packet components with a spectral resolution much better than the inverse of the attosecond pulse duration.

Research paper thumbnail of Generation of attosecond pulses in macroscopic media

Physical Review A, 1997

We describe theoretically the generation of ultrashort ͑subfemtosecond͒ pulses using high-order h... more We describe theoretically the generation of ultrashort ͑subfemtosecond͒ pulses using high-order harmonics of a laser pulse with a time-dependent degree of ellipticity. The single-atom response is calculated by using a low-frequency strong-field approximation. Propagation effects are taken into account using a method going beyond the slowly varying envelope approximation. Propagation modifies significantly the results obtained in the single-atom response and, in certain conditions, makes the generation of one attosecond pulse possible. We discuss prospects for the observation of these ultrashort pulses.

Research paper thumbnail of How can attosecond pulse train interferometry interrogate electron dynamics?

Photoniques, 2018

Light pulses of sub-100 as (1 as=10-18 s) duration, with photon energies in the extreme-ultraviol... more Light pulses of sub-100 as (1 as=10-18 s) duration, with photon energies in the extreme-ultraviolet (XUV) spectral domain, represent the shortest event in time ever made and controlled by human beings. Their first experimental observation in 2001 has opened the door to investigating the fundamental dynamics of the quantum world on the natural time scale for electrons in atoms, molecules and solids and marks the beginning of the scientific field now called attosecond science.

Research paper thumbnail of How can attosecond pulse train interferometry interrogate electron dynamics?

Photoniques, 2018

Light pulses of sub-100 as (1 as=10-18 s) duration, with photon energies in the extreme-ultraviol... more Light pulses of sub-100 as (1 as=10-18 s) duration, with photon energies in the extreme-ultraviolet (XUV) spectral domain, represent the shortest event in time ever made and controlled by human beings. Their first experimental observation in 2001 has opened the door to investigating the fundamental dynamics of the quantum world on the natural time scale for electrons in atoms, molecules and solids and marks the beginning of the scientific field now called attosecond science.

Research paper thumbnail of Free Induction Decay in the Extreme Ultraviolet

Frontiers in Optics 2015, 2015

We present an experimental study of controlled Free Induction Decay (FID) in the extreme ultravio... more We present an experimental study of controlled Free Induction Decay (FID) in the extreme ultraviolet regime excited by High-order Harmonics. The control is done by applying a delayed infrared pulse.

Research paper thumbnail of Free Induction Decay in the Extreme Ultraviolet

Frontiers in Optics 2015, 2015

We present an experimental study of controlled Free Induction Decay (FID) in the extreme ultravio... more We present an experimental study of controlled Free Induction Decay (FID) in the extreme ultraviolet regime excited by High-order Harmonics. The control is done by applying a delayed infrared pulse.

Research paper thumbnail of Gating attosecond pulses in a noncollinear geometry

Research paper thumbnail of Gating attosecond pulses in a noncollinear geometry

Research paper thumbnail of Efficient high-order harmonic generation boosted by below-threshold harmonics

Scientific Reports, 2013

High-order harmonic generation (HHG) in gases has been established as an important technique for ... more High-order harmonic generation (HHG) in gases has been established as an important technique for the generation of coherent extreme ultraviolet (XUV) pulses at ultrashort time scales. Its main drawback, however, is the low conversion efficiency, setting limits for many applications, such as ultrafast coherent imaging, nonlinear processes in the XUV range, or seeded free electron lasers. Here we introduce a novel scheme based on using below-threshold harmonics, generated in a ''seeding cell'', to boost the HHG process in a ''generation cell'', placed further downstream in the focused laser beam. By modifying the fundamental driving field, these low-order harmonics alter the ionization step of the nonlinear HHG process. Our dual-cell scheme enhances the conversion efficiency of HHG, opening the path for the realization of robust intense attosecond XUV sources.

Research paper thumbnail of Efficient high-order harmonic generation boosted by below-threshold harmonics

Scientific Reports, 2013

High-order harmonic generation (HHG) in gases has been established as an important technique for ... more High-order harmonic generation (HHG) in gases has been established as an important technique for the generation of coherent extreme ultraviolet (XUV) pulses at ultrashort time scales. Its main drawback, however, is the low conversion efficiency, setting limits for many applications, such as ultrafast coherent imaging, nonlinear processes in the XUV range, or seeded free electron lasers. Here we introduce a novel scheme based on using below-threshold harmonics, generated in a ''seeding cell'', to boost the HHG process in a ''generation cell'', placed further downstream in the focused laser beam. By modifying the fundamental driving field, these low-order harmonics alter the ionization step of the nonlinear HHG process. Our dual-cell scheme enhances the conversion efficiency of HHG, opening the path for the realization of robust intense attosecond XUV sources.

Research paper thumbnail of Sources and Diagnostics for Attosecond Science

Research paper thumbnail of Broadband attosecond pulse shaping

We use semiconductor (Si) and metallic (Al, Zr) transmission filters to shape, in amplitude and p... more We use semiconductor (Si) and metallic (Al, Zr) transmission filters to shape, in amplitude and phase, highorder harmonics generated from the interaction of an intense titanium sapphire laser field with a pulsed neon gas target. Depending on the properties of the filter, the emitted attosecond pulses can be optimized in bandwidth and/or pulse length. We demonstrate the generation of attosecond pulses centered at energies from 50 to 80 eV, with bandwidths as large as 45 eV and with pulse durations compressed to 130 as.

Research paper thumbnail of Sources and Diagnostics for Attosecond Science

Research paper thumbnail of High repetition rate XUV laser source based on OPCPA for photoemission electron microscopy applications

Research in Optical Sciences, 2014

ABSTRACT We present a 200 kHz XUV source driven by an optical parametric chirped pulse amplificat... more ABSTRACT We present a 200 kHz XUV source driven by an optical parametric chirped pulse amplification system. The advantage for photoemission electron microscopy of this high-repetition rate will be discussed.

Research paper thumbnail of High repetition rate XUV laser source based on OPCPA for photoemission electron microscopy applications

Research in Optical Sciences, 2014

ABSTRACT We present a 200 kHz XUV source driven by an optical parametric chirped pulse amplificat... more ABSTRACT We present a 200 kHz XUV source driven by an optical parametric chirped pulse amplification system. The advantage for photoemission electron microscopy of this high-repetition rate will be discussed.

Research paper thumbnail of Stabilized Interferometric Attosecond Timing Measurements

CLEO: 2013, 2013

ABSTRACT We perform interferometric attosecond timing measurements to study XUV photo-ionization ... more ABSTRACT We perform interferometric attosecond timing measurements to study XUV photo-ionization in noble gases, to diagnose macroscopic phase-matching conditions in high-order harmonic generation, and to investigate single-photon double-ionization by detecting electron pairs in coincidence.

Research paper thumbnail of Stabilized Interferometric Attosecond Timing Measurements

CLEO: 2013, 2013

ABSTRACT We perform interferometric attosecond timing measurements to study XUV photo-ionization ... more ABSTRACT We perform interferometric attosecond timing measurements to study XUV photo-ionization in noble gases, to diagnose macroscopic phase-matching conditions in high-order harmonic generation, and to investigate single-photon double-ionization by detecting electron pairs in coincidence.

Research paper thumbnail of Probing electron correlation on the attosecond time scale

Frontiers in Optics 2013, 2013

ABSTRACT We studied the single and double photoionization time delay in various noble gases. This... more ABSTRACT We studied the single and double photoionization time delay in various noble gases. This measurement allow us to access the dynamic of electron correlation.

Research paper thumbnail of Compact, few-cycle OPCPA system with ultralow CEP noise

Advanced Solid-State Lasers Congress, 2013

ABSTRACT A compact, high-repetition rate OPCPA system with CEP-stable 6.3 fs pulses duration and ... more ABSTRACT A compact, high-repetition rate OPCPA system with CEP-stable 6.3 fs pulses duration and 10 µJ of pulse energy is presented together with results from numerical simulations. First results of high harmonic generation will be shown.

Research paper thumbnail of On the phase of atomic polarization in harmonic generation processes

Please be patient while the object screen loads. Changez de vue : Choisir un site… UCL FUNDP FUSL... more Please be patient while the object screen loads. Changez de vue : Choisir un site… UCL FUNDP FUSL FUCaM. ...

Research paper thumbnail of Attosecond pump-probe electron interferometry

We present an interferometric pump-probe technique for the characterization of attosecond electro... more We present an interferometric pump-probe technique for the characterization of attosecond electron wave packets that uses a free wave packet as a reference to measure a bound packet. We demonstrate our method by exciting helium atoms using an attosecond pulse with a bandwidth centered near the ionization threshold, thus creating both a bound and a free wave packet simultaneously. After a variable delay, the bound wave packet is ionized by a few-cycle infrared laser precisely synchronized to the original attosecond pulse. By measuring the delay-dependent photoelectron spectrum we obtain an interferogram that contains both quantum beats as well as multi-path interference. Analysis of the interferogram allows us to determine the bound wave packet components with a spectral resolution much better than the inverse of the attosecond pulse duration.

Research paper thumbnail of Generation of attosecond pulses in macroscopic media

Physical Review A, 1997

We describe theoretically the generation of ultrashort ͑subfemtosecond͒ pulses using high-order h... more We describe theoretically the generation of ultrashort ͑subfemtosecond͒ pulses using high-order harmonics of a laser pulse with a time-dependent degree of ellipticity. The single-atom response is calculated by using a low-frequency strong-field approximation. Propagation effects are taken into account using a method going beyond the slowly varying envelope approximation. Propagation modifies significantly the results obtained in the single-atom response and, in certain conditions, makes the generation of one attosecond pulse possible. We discuss prospects for the observation of these ultrashort pulses.

Research paper thumbnail of How can attosecond pulse train interferometry interrogate electron dynamics?

Photoniques, 2018

Light pulses of sub-100 as (1 as=10-18 s) duration, with photon energies in the extreme-ultraviol... more Light pulses of sub-100 as (1 as=10-18 s) duration, with photon energies in the extreme-ultraviolet (XUV) spectral domain, represent the shortest event in time ever made and controlled by human beings. Their first experimental observation in 2001 has opened the door to investigating the fundamental dynamics of the quantum world on the natural time scale for electrons in atoms, molecules and solids and marks the beginning of the scientific field now called attosecond science.

Research paper thumbnail of How can attosecond pulse train interferometry interrogate electron dynamics?

Photoniques, 2018

Light pulses of sub-100 as (1 as=10-18 s) duration, with photon energies in the extreme-ultraviol... more Light pulses of sub-100 as (1 as=10-18 s) duration, with photon energies in the extreme-ultraviolet (XUV) spectral domain, represent the shortest event in time ever made and controlled by human beings. Their first experimental observation in 2001 has opened the door to investigating the fundamental dynamics of the quantum world on the natural time scale for electrons in atoms, molecules and solids and marks the beginning of the scientific field now called attosecond science.

Research paper thumbnail of Free Induction Decay in the Extreme Ultraviolet

Frontiers in Optics 2015, 2015

We present an experimental study of controlled Free Induction Decay (FID) in the extreme ultravio... more We present an experimental study of controlled Free Induction Decay (FID) in the extreme ultraviolet regime excited by High-order Harmonics. The control is done by applying a delayed infrared pulse.

Research paper thumbnail of Free Induction Decay in the Extreme Ultraviolet

Frontiers in Optics 2015, 2015

We present an experimental study of controlled Free Induction Decay (FID) in the extreme ultravio... more We present an experimental study of controlled Free Induction Decay (FID) in the extreme ultraviolet regime excited by High-order Harmonics. The control is done by applying a delayed infrared pulse.

Research paper thumbnail of Gating attosecond pulses in a noncollinear geometry

Research paper thumbnail of Gating attosecond pulses in a noncollinear geometry

Research paper thumbnail of Efficient high-order harmonic generation boosted by below-threshold harmonics

Scientific Reports, 2013

High-order harmonic generation (HHG) in gases has been established as an important technique for ... more High-order harmonic generation (HHG) in gases has been established as an important technique for the generation of coherent extreme ultraviolet (XUV) pulses at ultrashort time scales. Its main drawback, however, is the low conversion efficiency, setting limits for many applications, such as ultrafast coherent imaging, nonlinear processes in the XUV range, or seeded free electron lasers. Here we introduce a novel scheme based on using below-threshold harmonics, generated in a ''seeding cell'', to boost the HHG process in a ''generation cell'', placed further downstream in the focused laser beam. By modifying the fundamental driving field, these low-order harmonics alter the ionization step of the nonlinear HHG process. Our dual-cell scheme enhances the conversion efficiency of HHG, opening the path for the realization of robust intense attosecond XUV sources.

Research paper thumbnail of Efficient high-order harmonic generation boosted by below-threshold harmonics

Scientific Reports, 2013

High-order harmonic generation (HHG) in gases has been established as an important technique for ... more High-order harmonic generation (HHG) in gases has been established as an important technique for the generation of coherent extreme ultraviolet (XUV) pulses at ultrashort time scales. Its main drawback, however, is the low conversion efficiency, setting limits for many applications, such as ultrafast coherent imaging, nonlinear processes in the XUV range, or seeded free electron lasers. Here we introduce a novel scheme based on using below-threshold harmonics, generated in a ''seeding cell'', to boost the HHG process in a ''generation cell'', placed further downstream in the focused laser beam. By modifying the fundamental driving field, these low-order harmonics alter the ionization step of the nonlinear HHG process. Our dual-cell scheme enhances the conversion efficiency of HHG, opening the path for the realization of robust intense attosecond XUV sources.

Research paper thumbnail of Sources and Diagnostics for Attosecond Science

Research paper thumbnail of Broadband attosecond pulse shaping

We use semiconductor (Si) and metallic (Al, Zr) transmission filters to shape, in amplitude and p... more We use semiconductor (Si) and metallic (Al, Zr) transmission filters to shape, in amplitude and phase, highorder harmonics generated from the interaction of an intense titanium sapphire laser field with a pulsed neon gas target. Depending on the properties of the filter, the emitted attosecond pulses can be optimized in bandwidth and/or pulse length. We demonstrate the generation of attosecond pulses centered at energies from 50 to 80 eV, with bandwidths as large as 45 eV and with pulse durations compressed to 130 as.

Research paper thumbnail of Sources and Diagnostics for Attosecond Science

Research paper thumbnail of High repetition rate XUV laser source based on OPCPA for photoemission electron microscopy applications

Research in Optical Sciences, 2014

ABSTRACT We present a 200 kHz XUV source driven by an optical parametric chirped pulse amplificat... more ABSTRACT We present a 200 kHz XUV source driven by an optical parametric chirped pulse amplification system. The advantage for photoemission electron microscopy of this high-repetition rate will be discussed.

Research paper thumbnail of High repetition rate XUV laser source based on OPCPA for photoemission electron microscopy applications

Research in Optical Sciences, 2014

ABSTRACT We present a 200 kHz XUV source driven by an optical parametric chirped pulse amplificat... more ABSTRACT We present a 200 kHz XUV source driven by an optical parametric chirped pulse amplification system. The advantage for photoemission electron microscopy of this high-repetition rate will be discussed.

Research paper thumbnail of Stabilized Interferometric Attosecond Timing Measurements

CLEO: 2013, 2013

ABSTRACT We perform interferometric attosecond timing measurements to study XUV photo-ionization ... more ABSTRACT We perform interferometric attosecond timing measurements to study XUV photo-ionization in noble gases, to diagnose macroscopic phase-matching conditions in high-order harmonic generation, and to investigate single-photon double-ionization by detecting electron pairs in coincidence.

Research paper thumbnail of Stabilized Interferometric Attosecond Timing Measurements

CLEO: 2013, 2013

ABSTRACT We perform interferometric attosecond timing measurements to study XUV photo-ionization ... more ABSTRACT We perform interferometric attosecond timing measurements to study XUV photo-ionization in noble gases, to diagnose macroscopic phase-matching conditions in high-order harmonic generation, and to investigate single-photon double-ionization by detecting electron pairs in coincidence.

Research paper thumbnail of Probing electron correlation on the attosecond time scale

Frontiers in Optics 2013, 2013

ABSTRACT We studied the single and double photoionization time delay in various noble gases. This... more ABSTRACT We studied the single and double photoionization time delay in various noble gases. This measurement allow us to access the dynamic of electron correlation.

Research paper thumbnail of Compact, few-cycle OPCPA system with ultralow CEP noise

Advanced Solid-State Lasers Congress, 2013

ABSTRACT A compact, high-repetition rate OPCPA system with CEP-stable 6.3 fs pulses duration and ... more ABSTRACT A compact, high-repetition rate OPCPA system with CEP-stable 6.3 fs pulses duration and 10 µJ of pulse energy is presented together with results from numerical simulations. First results of high harmonic generation will be shown.