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Статті в журналах з теми "La génération d'harmoniques d'ordre élevé"
Tcherbakoff, O., J. Plumridge, D. Descamps, E. Mével, F. Salin, and E. Constant. "Confinement temporel de la génération d'harmoniques d'ordre élevé." Journal de Physique IV (Proceedings) 108 (June 2003): 93–96. http://dx.doi.org/10.1051/jp4:20030604.
Повний текст джерелаAntoine, P., B. Carré, M. Gaarde, M. Lewenstein, A. L'Huillier, A. Persson, and P. Salières. "Génération d'harmoniques d'ordre élevé dans les gaz : résultats récents." Annales de Physique 22 (February 1997): C1–45—C1–52. http://dx.doi.org/10.1051/anphys/1997007.
Повний текст джерелаValentin, C., S. Kazamias, D. Douillet, Th Lefrou, F. Augé, S. Sebban, Ph Balcou, and V. Véniard. "Étude de la génération d'harmoniques anormales d'ordre élevé à basse intensité." Journal de Physique IV (Proceedings) 127 (June 2005): 181–85. http://dx.doi.org/10.1051/jp4:2005127028.
Повний текст джерелаMerdji, H., P. Salières, J. F. Hergott, P. Monot, P. d'Oliveira, T. Auguste, B. Carré, et al. "Nouvelles perspectives de diagnostics de plasmas denses par génération d'harmoniques d'ordre élevé." Le Journal de Physique IV 11, PR7 (October 2001): Pr7–81—Pr7–86. http://dx.doi.org/10.1051/jp4:2001727.
Повний текст джерелаRiedel, D., J. L. Hernandez-Pozos, K. W. Kolasinski, S. Baggott, and R. E. Palmer. "Source UVX par génération d'harmoniques d'ordre élevé : applications potentielles à la physique des surfaces." Le Journal de Physique IV 11, PR7 (October 2001): Pr7–73—Pr7–76. http://dx.doi.org/10.1051/jp4:2001725.
Повний текст джерелаL'Huillier, A., and P. Balcou. "Une nouvelle source cohérente UVX : la génération d'harmoniques d'ordre élevé d'un rayonnement laser intense." Annales de Physique 17 (June 1992): 181–82. http://dx.doi.org/10.1051/anphys/1992035.
Повний текст джерелаValentin, C., O. Boyko, G. Rey, B. Mercier, E. Papalazarou, and L. Antonucci. "Étude expérimentale de l'optimisation de la génération d'harmoniques d'ordre élevé par l'utilisation d'un algorithme génétique." Journal de Physique IV (Proceedings) 138, no. 1 (December 2006): 35–41. http://dx.doi.org/10.1051/jp4:2006138005.
Повний текст джерелаBoyko, O., D. Reitze, S. Kazamias, T. A. Planchon, C. Valentin, and Ph Balcou. "Optimisation de la génération d'harmoniques d'ordre élevé à l'aide d'une optique adaptative et d'un modulateur acousto-optique." Journal de Physique IV (Proceedings) 127 (June 2005): 99–103. http://dx.doi.org/10.1051/jp4:2005127015.
Повний текст джерелаZaïr, A., I. J. Sola, R. López-Martens, P. Johnsson, E. Cormier, K. Varjù, J. Mauritsson, et al. "Contrôle de la génération d'harmoniques d'ordres élevés par modulation de l'ellipticité du fondamental." Journal de Physique IV (Proceedings) 127 (June 2005): 91–98. http://dx.doi.org/10.1051/jp4:2005127014.
Повний текст джерелаValentin, C., F. Weihe, S. Kazamias, R. Haroutunian, S. Sebban, G. Grillon, F. Augé, et al. "Mesure de la dynamique couplée de propagation et d'ionisation d'une impulsion laser – Application au laser X-OFI ou à la génération d'harmoniques d'ordres élevés." Journal de Physique IV (Proceedings) 108 (June 2003): 109–12. http://dx.doi.org/10.1051/jp4:20030608.
Повний текст джерелаДисертації з теми "La génération d'harmoniques d'ordre élevé"
George, Hervé. "Génération d'harmoniques d'ordre élevé sur miroir plasma." Paris 11, 2010. http://www.theses.fr/2010PA112304.
Повний текст джерелаWhen an intense laser beam is focused on a solid target, the target's surface is rapidly ionized and forms dense plasma that reflects the incident field. For laser intensities above few 10 to the power of 15 Wcm-2, high order harmonics of the laser frequency, associated in the time domain to a train of attosecond pulses (1 as = 10 to the power of -18 s), can be generated upon this reflection. Ln this thesis, we developed numerical tools to reveal original aspects of harmonic generation mechanisms in three different interaction regime: the coherent wake emission, the relativistic emission and the resonant absorption. Ln particular, we established the role of these mechanisms when the target is a very thin foil (thickness of the order of 100 nm). Then we study experimentally the spectral, spatial and coherence properties of the emitted light. We illustrate how to exploit these measurements to get information on the plasma mirror dynamics on the femtosecond and attosecond time scales. Last, we propose a technique for the single-shot complete characterization of the temporal structure of the harmonic light emission from the laser-plasma mirror interaction
Zair, Amelle. "Production et caractérisation d'impulsions attosecondes VUV par génération d'harmoniques d'ordre élevé." Phd thesis, Université Sciences et Technologies - Bordeaux I, 2006. http://tel.archives-ouvertes.fr/tel-00111726.
Повний текст джерелаAu CELIA, nous avons implémenté une technique de post-compression qui nous a permi de comprimer nos impulsions laser IR de 40 fs à 9 fs (1fs=10-15s). Ces impulsions sont ensuite utilisée pour confiner la HHG. Étant donné que le processus de HHG est efficace uniquement si les impulsions IR génératrices sont polarisées linéairement, nous avons créé une porte dans le profil temporel de nos impulsions sub-10fs où la polarisation est linéaire pendant une durée inferieure à la durée de l'impulsion IR génératrice. Ceci nous permet de confiner la HHG en dessous d'un demi-cycle optique IR. Cette technique de porte d'ellipticité, complètement caractérisée dans cette thèse, nous a permis de confiner la HHG jusqu'à l'émission d'une à deux impulsions attosecondes. Afin de caractériser le profil temporel du train d'impulsions attosecondes, nous avons également implémenté un interféromètre à deux couleurs qui nous a permit de mesurer la phase harmonique et de reconstruire nos trains d'impulsions attosecondes.
Zaïr, Amelle. "Production et caractérisation d'impulsions attosecondes VUV par génération d'harmoniques d'ordre élevé." Bordeaux 1, 2006. http://www.theses.fr/2006BOR13192.
Повний текст джерелаChappuis, Céline. "Génération d'harmoniques d'ordre élevé à deux faisceaux portant du moment angulaire." Thesis, Université Paris-Saclay (ComUE), 2019. http://www.theses.fr/2019SACLS022/document.
Повний текст джерелаHigh-order harmonic generation is a highly nonlinear laser-matter interaction process which allows the synthesis of sub-femtosecond pulses, also called attosecond (1 as = 10⁻¹⁸ s) pulses. My PhD is centered around the study of angular momentum transfer during this process, in order to control spatial and polarization features of the radiation which is emitted in the extreme ultraviolet. As for matter, the angular momentum of light can be divided into a spin component, associated with the beam’s polarization, and an orbital component, related to the shape of the wavefront. The control of high harmonics’ angular momentum requires generating schemes involving two crossing beams, thus creating a diffraction grating in the generating medium.We have shown that, although the transfer rules obey conservation laws of the angular momentum, the fine description of the phenomenon requires an accurate analysis of the laser field in the generation medium. This work opens the road for advanced shaping of attosecond pulses
Géneaux, Romain. "Le moment angulaire de la lumière en génération d'harmoniques d'ordre élevé." Thesis, Université Paris-Saclay (ComUE), 2016. http://www.theses.fr/2016SACLS474/document.
Повний текст джерелаAngular momentum is an ubiquitous quantity in all areas of physics. Just like matter, radiation carries angular momentum. It can be decomposed in two parts, namely the spin angular momentum (SAM) and the orbital angular momentum (OAM). Each one of these components has very specific properties and lead to numerous applications using visible and infrared light. In this thesis, we study the behavior of these two types of light angular momentum in a very non-linear process called high harmonic generation (HHG). In this physical process known since 1987, an intense infrared laser is focused into an atomic or molecular gas jet, which in the right intensity regime allows to generate a radiation which has a short wavelength (extreme ultraviolet domain) and is extremely brief (attosecond, 1 as = 10⁻¹⁸ s).We begin by describing theoretically this process, as well as defining in depth the notion of light angular momentum. We then study HHG from an infrared laser carrying OAM. This allows to obtain an unique light source, generating ultrashort light pulses of controlled orbital angular momentum with a wavelength of the order of 10 nm. We then study GHOE from beams carrying MAS. Using a resonance from the generation gas, we manage to transfer this angular momentum to the emitted extreme ultraviolet radiation. This radiation is finally used to measure photoionisation circular dichroisms in chiral molecules, measurements previously restricted to synchrotron sources. This paves the way towards chiroptic time resolved measurement on a femto/attosecond timescale
Kovačev, Milutin. "Rayonnement harmonique d'ordre élevé : génération d'impulsions attosecondes : applications de la cohérence." Paris 11, 2003. http://www.theses.fr/2003PA112297.
Повний текст джерелаThe work presented in this thesis is dedicated to the characterization and optimisation of the unique properties of high order harmonic generation in a rare gas: high brilliance, short pulse duration (femtosecond to attosecond, 1as = 10^(-18)s) and good mutual coherence. In the first part of this work, we concentrate on the exploitation of a scaling law using a high-energy laser loosely focused inside an extended gaseous medium. For the first time, the generated harmonic energy exceeds the 1mJ level per laser pulse m the 15th harmonic order at a wavelength of 53nm. The conversion efficiency reaches 4x10^(-5), which results from the combination of a strong dipolar response and a good phase matching within a generating volume that is extended by selfguiding of the generating laser pulse. In the second part, our interest is devoted to the temporal profile of the harmonic emission and its attosecond structure. We first demonstrate the feasibility of a spatial/spectral selection of the contributions associated to the two main electronic trajectories, allowing thereby the generation of regular attosecond pulse trains. We then characterize such an attosecond pulse train by the measurement of the relative phases of consecutive harmonics. Finally, we describe an original technique for the temporal confinement of the harmonic emission by manipulating the ellipticity of the generating laser beam. In the third part, our interest is dedicated to the mutual coherence properties of the harmonic emission. We first demonstrate the precise control of the relative phase of the harmonic pulses by multiple beam interference in the XUV. This frequency-domain interferometry using four phase-locked temporally separated pulses shows an extreme sensitivity to the relative phase of the pulses on an attosecond time scale. We then measure for the first time the first order autocorrelation trace of the harmonic beam thanks to the generation of two harmonic sources mutually coherent and spatially separated. We study the influence of the spatial separation between the harmonic sources on the measured interferograms. These studies provide a way towards Fourier transform spectroscopy in the XUV
Thiré, Nicolas. "Photodynamiques moléculaires sondées par imagerie de vecteurs vitesses et génération d'harmoniques d'ordre élevé." Phd thesis, Toulouse 3, 2011. http://thesesups.ups-tlse.fr/1403/.
Повний текст джерелаThis thesis deals with the study of ultrafast phenomena, particularly the relaxation dynamics initiated by a femtosecond pulse (10-15 s). In the first part, velocity map imaging was used to study two systems: methyl iodide (CH3I), in its first excited Rydberg state and tetrathiafulvalene (TTF -C6H4S4). In the TTF, the aim is to characterize the two major absorption bands at 300 nm. During the study of the predissociation of CH3I, the vibrational distribution of the CH3 fragment was characterized,whereas as far as the TTF is concerned bond strength of the dimer was extracted. The interpretation of photoelectron spectra of CH3I provides a good understanding of the dynamics from and/or in resonance with states near the ionization potential. In the second part, the electronic structure of atom or molecule is probed by high order harmonics generation (HHG). The minimum of the total photoionization cross section of argon (Cooper minimum) was observed and studied in the harmonic spectrum. This study allowed, among other things, for the design of a reliable and comprehensive theoretical model. Then the HHG in a chiral molecule: the fenchone (C10H16O), clearly showed the sensitivity of the harmonic process to the chirality, while interacting with an elliptically polarized field. Finally, HHG was used to probe molecular dynamics initiated by a transient excitation grating at 400 nm in nitrogen dioxide (NO2). This at picosecond time scale : photodissociation, and femtosecond time scale : population transfer via a conical intersection
Thiré, Nicolas. "Photodynamiques moléculaires sondées par imagerie de vecteurs vitesses et génération d'harmoniques d'ordre élevé." Phd thesis, Université Paul Sabatier - Toulouse III, 2011. http://tel.archives-ouvertes.fr/tel-00663009.
Повний текст джерелаHiguet, Julien. "Études structurelles et dynamiques de systèmes atomiques ou moléculaires par génération d'harmoniques d'ordre élevé." Phd thesis, Université Sciences et Technologies - Bordeaux I, 2010. http://tel.archives-ouvertes.fr/tel-00555111.
Повний текст джерелаHiguet, Julien. "Etudes structurelles et dynamiques de systèmes atomiques ou moléculaires par génération d'harmoniques d'ordre élevé." Thesis, Bordeaux 1, 2010. http://www.theses.fr/2010BOR14078/document.
Повний текст джерелаHigh harmonic generation is a well known phenomenon explained by a “three step” model: because of the high intensity field generated by an ultrashort laser pulse, an atom or a molecule can be tunnel ionized. The ejected electron is then accelerated by the intense electric field, and eventually can recombine on its parent ion, leading to the emission of a XUV photon. Because of the generating process in itself, this light source is a promising candidate to probe the electronic structure of atoms and molecules, with an attosecond/sub-nanometer potential resolution (1 as=10-18 s).In this work, we have studied the sensitivity of the emitted light (in terms of amplitude, but also phase and polarization) towards the electronic structure of the generating medium. We have first worked on atomic medium, then on molecules (N2, CO2, O2). Comparing the experimental results with numerical simulations shows the necessity to model finely the generation process and to go beyond commonly used approximations.We have also shown the possibility to perform high harmonic spectroscopy in order to measure dynamics of complex molecules, such as Nitrogen Dioxide (NO2). This technic has obtained complementary results compared to classical spectroscopy and has revealed dynamics of the electronic wavepacket along a conical intersection. In this experiment, we have adapted conventionnal optical spectroscopy technics to the XUV spectral area, which significantly improved the signal over noise ratio
Тези доповідей конференцій з теми "La génération d'harmoniques d'ordre élevé"
Cabasse, A., G. Machinet, C. Hazera, S. Petit, E. Cormier, and E. Constant. "Génération d'harmoniques d'ordre élevé en régime de forte focalisation à 100 kHz." In UVX 2012 - 11e Colloque sur les Sources Cohérentes et Incohérentes UV, VUV et X ; Applications et Développements Récents, edited by E. Constant, P. Martin, and H. Bachau. Les Ulis, France: EDP Sciences, 2013. http://dx.doi.org/10.1051/uvx/201302002.
Повний текст джерела