Philippe Zeitoun
École Polytechnique
Network
Latest external collaboration on country level. Dive into details by clicking on the dots.
Publication
Featured researches published by Philippe Zeitoun.
Nature | 2004
Philippe Zeitoun; Gabriel Faivre; S. Sebban; Tomas Mocek; A. Hallou; M. Fajardo; D. Aubert; Philippe Balcou; F. Burgy; D. Douillet; S. Kazamias; G. De Lachèze-Murel; T. Lefrou; S. Le Pape; Pascal Mercère; H. Merdji; Anne-Sophie Morlens; Jean-Philippe Rousseau; C. Valentin
Synchrotrons have for decades provided invaluable sources of soft X-rays, the application of which has led to significant progress in many areas of science and technology. But future applications of soft X-rays—in structural biology, for example—anticipate the need for pulses with much shorter duration (femtoseconds) and much higher energy (millijoules) than those delivered by synchrotrons. Soft X-ray free-electron lasers should fulfil these requirements but will be limited in number; the pressure on beamtime is therefore likely to be considerable. Laser-driven soft X-ray sources offer a comparatively inexpensive and widely available alternative, but have encountered practical bottlenecks in the quest for high intensities. Here we establish and characterize a soft X-ray laser chain that shows how these bottlenecks can in principle be overcome. By combining the high optical quality available from high-harmonic laser sources (as a seed beam) with a highly energetic soft X-ray laser plasma amplifier, we produce a tabletop soft X-ray femtosecond laser operating at 10 Hz and exhibiting full saturation, high energy, high coherence and full polarization. This technique should be readily applicable on all existing laser-driven soft X-ray facilities.
Optics Letters | 2003
Pascal Mercère; Philippe Zeitoun; Mourad Idir; Sebastien Le Pape; Denis Douillet; Xavier Levecq; Guillaume Dovillaire; Samuel Bucourt; Kenneth A. Goldberg; Patrick P. Naulleau; Senajith Rekawa
We report, for the first time to our knowledge, experimental demonstration of wave-front analysis via the Hartmann technique in the extreme ultraviolet range. The reference wave front needed to calibrate the sensor was generated by spatially filtering a focused undulator beam with 1.7- and 0.6-microm-diameter pinholes. To fully characterize the sensor, accuracy and sensitivity measurements were performed. The incident beams wavelength was varied from 7 to 25 nm. Measurements of accuracy better than lambdaEUV/120 (0.11 nm) were obtained at lambdaEUV = 13.4 nm. The aberrations introduced by an additional thin mirror, as well as wave front of the spatially unfiltered incident beam, were also measured.
Optics Letters | 2006
Anne-Sophie Morlens; J. Gautier; Gilles Rey; Philippe Zeitoun; Jean-Pascal Caumes; Marylène Kos-Rosset; H. Merdji; S. Kazamias; K. Cassou; M. Fajardo
Soft-x-ray digital in-line microscopic holography is achieved using a fully coherent high-order harmonic source emitting at 32 nm. Combination of commercial-grade soft-x-ray optics and a back-illuminated CCD detector allows a compact and versatile holographic setup. Different experimental geometries have been tested by imaging calibrated 50 nm tips and 1 microm wires. Spatial resolution of 800 nm is measured with magnifications ranging from 30 to 110 and a numerical aperture around 0.01. Finally, the potentiality of three-dimensional numerical reconstruction from a single hologram acquisition is shown experimentally.
Optics Express | 2011
Boris Vodungbo; Anna Barszczak Sardinha; J. Gautier; G. Lambert; C. Valentin; Magali Lozano; Grégory Iaquaniello; Franck Delmotte; S. Sebban; Jan Lüning; Philippe Zeitoun
We report the generation of circularly polarized high order harmonics in the extreme ultraviolet range (18-27 nm) from a linearly polarized infrared laser (40 fs, 0.25 TW) focused into a neon filled gas cell. To circularly polarize the initially linearly polarized harmonics we have implemented a four-reflector phase-shifter. Fully circularly polarized radiation has been obtained with an efficiency of a few percents, thus being significantly more efficient than currently demonstrated direct generation of elliptically polarized harmonics. This demonstration opens up new experimental capabilities based on high order harmonics, for example, in biology and materials science. The inherent femtosecond time resolution of high order harmonic generating table top laser sources renders these an ideal tool for the investigation of ultrafast magnetization dynamics now that the magnetic circular dichroism at the absorption M-edges of transition metals can be exploited.
Optics Letters | 2005
Anne-Sophie Morlens; Philippe Balcou; Philippe Zeitoun; C. Valentin; Vincent Laude; S. Kazamias
In the race toward attosecond pulses, for which high-order harmonics generated in rare gases are the best candidates, both the harmonic spectral range and the spectral phase have to be controlled. We demonstrate that multilayer extreme-ultraviolet chirped mirrors can be numerically optimized and designed to compensate for the intrinsic harmonic chirp that was recently discovered and that is responsible for temporal broadening of pulses. A simulation shows that an optimized mirror is capable of compressing the duration from approximately 260 to 90 as. This new technique is an interesting solution because of its ability to cover a wider spectral range than other technical devices that have already been proposed to overcome the chirp of high harmonics.
Optics Letters | 2006
Anne Sophie Morlens; Rodrigo Lopez-Martens; O. Boyko; Philippe Zeitoun; Philippe Balcou; Katalin Varjú; E. Gustafsson; Thomas Remetter; Anne L'Huillier; S. Kazamias; J. Gautier; Franck Delmotte; Marie Françoise Ravet
A novel multilayer mirror was designed and fabricated based on a recently developed three-material technology aimed both at reaching reflectivities of about 20% and at controlling dispersion over a bandwidth covering photon energies between 35 and 50 eV. The spectral phase upon reflection was retrieved by measuring interferences in a two-color ionization process using high-order harmonics produced from a titanium: sapphire laser. We demonstrate the feasibility of designing and characterizing phase-controlled broadband optics in the extreme-ultraviolet domain, which should facilitate the manipulation of attosecond pulses for applications.
Optics Express | 2009
J. Chalupský; L. Juha; V. Hajkova; J. Cihelka; L. Vyšĺn; J. Gautier; Janos Hajdu; Stefan P. Hau-Riege; M. Jurek; J. Krzywinski; Richard A. London; E. Papalazarou; J.B. Pełka; G. Rey; S. Sebban; R. Sobierajski; N. Stojanovic; Kai Tiedtke; S. Toleikis; T. Tschentscher; C. Valentin; H. Wabnitz; Philippe Zeitoun
We report the first observation of single-shot soft x-ray laser induced desorption occurring below the ablation threshold in a thin layer of poly (methyl methacrylate)--PMMA. Irradiated by the focused beam from the Free-electron LASer in Hamburg (FLASH) at 21.7 nm, the samples have been investigated by atomic-force microscope (AFM) enabling the visualization of mild surface modifications caused by the desorption. A model describing non-thermal desorption and ablation has been developed and used to analyze single-shot imprints in PMMA. An intermediate regime of materials removal has been found, confirming model predictions. We also report below-threshold multiple-shot desorption of PMMA induced by high-order harmonics (HOH) at 32 nm. Short-time exposure imprints provide sufficient information about transverse beam profile in HOHs tight focus whereas long-time exposed PMMA exhibits radiation-initiated surface ardening making the beam profile measurement infeasible.
Nature Communications | 2015
Guillaume Lambert; B. Vodungbo; J. Gautier; B. Mahieu; Victor Malka; S. Sebban; Philippe Zeitoun; Jan Lüning; Jonathan Perron; A. Andreev; S. Stremoukhov; F. Ardana-Lamas; A. Dax; Christoph P. Hauri; Anna Barszczak Sardinha; M. Fajardo
Recent advances in high-harmonic generation gave rise to soft X-ray pulses with higher intensity, shorter duration and higher photon energy. One of the remaining shortages of this source is its restriction to linear polarization, since the yield of generation of elliptically polarized high harmonics has been low so far. We here show how this limitation is overcome by using a cross-polarized two-colour laser field. With this simple technique, we reach high degrees of ellipticity (up to 75%) with efficiencies similar to classically generated linearly polarized harmonics. To demonstrate these features and to prove the capacity of our source for applications, we measure the X-ray magnetic circular dichroism (XMCD) effect of nickel at the M2,3 absorption edge around 67 eV. There results open up the way towards femtosecond time-resolved experiments using high harmonics exploiting the powerful element-sensitive XMCD effect and resolving the ultrafast magnetization dynamics of individual components in complex materials.
Journal of The Optical Society of America B-optical Physics | 2000
Jean-Christophe Chanteloup; Estelle Salmon; Christian Sauteret; A. Migus; Philippe Zeitoun; A. Klisnick; Antoine Carillon; Stéphane Hubert; David Ros; P. V. Nickles; M.P. Kalachnikov
We have implemented an adjustable traveling-wave method of excitation for the transverse pumping of laser media based on tilting one of the gratings of the compressor of a chirped pulse amplification [Opt. Commun.56, 219 (1985)] (CPA) laser chain. We show that the only requirement to obtain the best locally compressed pulse is to slightly tilt and translate one of the gratings from its original position. Exact and approximate expressions of these two motions are derived, allowing an easy reconfiguration of any CPA laser. An experimental validation is performed with the first observation of a unidirectional soft-x-ray lasing when subpicosecond pumping pulses are used.
Optics Letters | 2003
Raymond F. Smith; James Dunn; James R. Hunter; Joseph Nilsen; S. Hubert; Sylvie Jacquemot; Christian Remond; Remy Marmoret; M. Fajardo; Philippe Zeitoun; Laurent Vanbostal; Ciaran Lewis; Marie Françoise Ravet; Franck Delmotte
We present what is to our knowledge the first longitudinal coherence measurement of a transient inversion collisional x-ray laser. We investigated the picosecond output of a Ni-like Pd x-ray laser at 14.68 nm generated by the COMET laser facility at the Lawrence Livermore National Laboratory. Interference fringes were generated with a Michelson interferometer setup in which a thin multilayer membrane was used as a beam splitter. We determined the longitudinal coherence for the 4dS01→4pP11 lasing transition to be ~400μm (1/e half-width) by changing the length of one interferometer arm and measuring the resultant variation in fringe visibility. The inferred gain-narrowed linewidth of ~0.29pm is a factor of 4 less than previously measured in quasi-steady-state x-ray laser schemes.