3rd international workshop on laser-matter …wlmi12/bookwlmi12.pdf47 have been selected for oral...

Edited 27 April 2012

3rd INTERNATIONAL WORKSHOP ON LASER-MATTER

INTERACTION 2012

June 25-29, 2012 Porquerolles, France

Book of abstracts

WORKSHOP ON LASER-MATTER INTERACTION 2012

WLMI-2012

Dear Participants, It is a real pleasure to welcome you to this third edition of the Workshop on Laser-Matter Interaction. After Luminy in 2008, Porquerolles in 2010, we are pleased to see that this meeting is growing and attracting new generations of scientists. This third international edition, again held at Porquerolles, will hopefully broaden the community and strengthen ties between various laboratories with worldwide reputation. The island of Porquerolles was chosen for its beauty and also for the convenient facilities offered by the IGESA housing. We are 67 registered participants and received 65 contributions. Among those, 47 have been selected for oral sessions and 16 for the poster session. The sessions have been organized into 20 minutes talks and posters. We tried to mostly follow the participants’ wishes, but we were also concerned with keeping a certain coherence between all the topics addressed within each session. We willingly leave the beginning of the afternoons free (between 14:00 and 17:00), so that everybody can enjoy the island by walking or riding a bicycle, by contemplating the Mediterranean depths, or even by tasting local wines. We would like to thank the generous organizations that contributed either financially or by other means to the workshop, namely, the CEA-DAM at Bruyères-le-Châtel and several of its departments, the Laser-Plasmas Institute in France, and the Max-Planck Institute in Germany. We hope that you – and your family for some of you – will enjoy this meeting and your stay at Porquerolles.

Organizing committee Luc Bergé CEA France Christophe Rousseaux CEA France Stefan Skupin MPI-PKS Germany

Scientific committee

S. Baton France O. Kosareva Russia D. Lannes France R. Sauerbrey Germany W. Krolikowski Australia


WLMI-2012

Program

Monday, June 25

19:15 Welcome reception

Tuesday, June 26 08:30-08:50 ........... Opening, L. Bergé 08:50-10:30 ....... Session “Rogue waves and supercontinuum generation” Chair: S. L. Chin 08:50-09:10 N. Akhmediev “New results in rogue wave theory” 09:10-09:30 G. Steinmeyer “Rogue waves in multifilaments” 09:30-09:50 R. Driben “Accelerated rogue waves generated by soliton fusion at the advanced stage of

supercontinuum formation in photonic crystal fibers” 09:50-10:10 O. Bang “High power supercontinuum generation in tapered photonic crystal fibers” 10:10-10:30 Ph. Russel “Gas-based nonlinear optics in photonic crystal fibres”

10:30-11:00 Coffee break

11:00-12:20 ....... Session “Optical self-focusing and self-guiding” Chair: L. Bergé 11:00-11:20 G. Fibich “Loss of phase in continuations of the NLS beyond the singularity” 11:20-11:40 D. Lannes “Derivation and analysis of various NLS-type equations from Maxwell equations” 11:40-12:00 J. Rauch “Optical focusing for monochromatic scalar and electromagnetic waves” 12:00-12:20 D. Zezyulin “Nonlinear modes and beam amplification in PT-symmetry parabolic potential”

12:30 Lunch

17:00-18:40 ....... Session “Laser-driven particle acceleration” Chair: P. Mora 17:00-17:20 M. Bussmann “Taking the fast lane on laser acceleration” 17:20-17:40 X. Davoine “Quasi-cylindrical PIC modelling of laser interaction with low density plasmas” 17:40-18:00 J. Liu “Electron acceleration from ultraintense laser-plasma interaction” 18:00-18:20 S. Ter-Avetisyan “Novel property of laser-plasma interaction, namely the capability of acting as a

source of high energy and high brightness neutral and negative ion beams” 18:20-18:40 M. Borghesi “Ion acceleration driven by ultra-intense, high contrast laser pulses”


WLMI-2012

Wednesday, June 27 08:30-10:10 ....... Session “Ionization and high-harmonic generation” Chair: M. Kolesik 08:30-08:50 M. Ivanov “Time-delays in ionization: real, imaginary, and imagined” 08:50-09:10 C. Köhler “Higher-order Kerr terms vs. plasma: Saturation of the nonlinear refractive index” 09:10-09:30 F. Quéré “Attosecond lighthouses: A new tool for ultrafast science and metrology” 09:30-09:50 C. Varin “Modelling intense laser-plasma processes – Bridging the gap between microscopic and

macroscopic phenomena” 09:50-10:10 E. Larsen “High-harmonic generation at 200 kHz repetition rate”


10:40-12:20 ....... Session “Laser-plasma parametric instabilities and amplification processes”

Chair: P. Audebert 10:40-11:00 D. Marion “Simulation of stimulated Brillouin scattering in the case of a non-monochromatic pump

wave” 11:00-11:20 P. Lushnikov “Collective stimulated Brillouin scatter” 11:20-11:40 P. Mounaix “When a (seemingly) simple LPI problem leads to interesting questions in statistical

field theory” 11:40-12:00 L. Lancia “SBS in the strong coupling regime. Short pulse amplification and plasma

characterization” 12:00-12:20 R. Trines “Raman compression of long laser pulses to picosecond duration for fast-ignition fusion

and high energy density physics”

12:30 Lunch

17:00-19:00 ....... Poster Session


WLMI-2012

Thursday, June 28 08:30-10:10 ....... Session “Laser Filamentation” Chair: W. Krolikowski 08:30-08:50 S. L. Chin “Filamentation science in air” 08:50-09:10 O. Kosareva “Single-cycle infrared pulse formation in the femtosecond filament” 09:10-09:30 M. Kolesik “Holistic approach to models of non-linear optical response on femtosecond time-

scales” 09:30-09:50 P. Polynkin “Propagation dynamics of ultraintense femtosecond optical vortices in air” 09:50-10:10 V. Kompanets “Frequency-angular spectrum under filamentation of chirped femtosecond pulses in

fused silica”


10:40-12:00 ....... Session “Inertial confinement fusion and Astrolab” Chair: V. Tikhonchuk 10:40-11:00 J.-L. Miquel “Overview of LMJ and PETAL projects” 11:00-11:20 G. Huser “Equation of state and Rayleigh-Taylor growth experimental studies of Ge-doped CH

ablator” 11:20-11:40 A. Ravasio “Laboratory astrophysics with high power lasers” 11:40-12:00 S. Bouquet “Instabilities in Supernova remnants”

12:30 Lunch

17:00-18:40 ....... Session “Ultrashort pulse laser-plasma interaction” Chair: M. Borghesi 17:00-17:20 M. Kaluza “Laser-driven particle acceleration in Jena, Germany” 17:20-17:40 V. Tikhonchuk “Electron dynamics in ultra-relativistic laser fields and the effects of the radiation

reaction force” 17:40-18:00 A. Savel’ev “Femtosecond laser-plasma interaction with prepulse-generated liquid metal

microjets” 18:00-18:20 F. Deneuville “Dielectric function measurements of nonequilibrium warm dense matter using

Fourier domain interferometry” 18:20-18:40 P. Audebert “Investigation of hard X-ray free electron laser heated foils”

19:30 WLMI Conference Dinner


WLMI-2012

Friday, June 29 08:30-09:50 ....... Session “Modeling in nonlinear optics” Chair: G. Fibich 08:30-08:50 J.-G. Caputo “Fourier mode dynamics for the nonlinear Schrödinger equation in one-dimensional

bounded domains” 08:50-09:10 E. Dumas “Some variants of the focusing NLS equations. Derivation, justification and open

problems” 09:10-09:30 R. Conte “Investigation of exact solutions of a coupled Kerr-SBS system” 09:30-09:50 B. Bidegaray-Fesquet “Modeling Coulomb interactions in a quantum dot Bloch model”


10:20-12:15 ....... Session “From nonlinear optics to Plasmas” Chair: O. Kosareva 10:20-10:40 G. Duchateau “Time-dependent ionization models designed for intense and short laser pulse

propagation in dielectric materials” 10:40-11:00 L. Videau “Recent advances in ESTHER code” 11:00-11:20 W. Krolikowski “Laser processing with ultrashort vortex pulses” 11:20-11:40 V. Skarka “Self-organization of dissipationless solitons in positive- and negative-refractive- index

materials and spontaneous generation of novel vortex solitons” 11:40-12:00 A. Ferrando “Soliplasmon dynamics and nonlinear excitation of surface plasmon resonances” 12:00-12:15 .......... Closing, Organizing Committee

12:30 Lunch

14:00 Departure


WLMI-2012

Oral contributions O 1: New results in rogue wave theory ........................................................................... 10 O 2: Rogue Waves in Multifilaments ............................................................................... 11 O 3: Accelerated rogue waves generated by soliton fusion at the advanced stage of

supercontinuum formation in photonic crystal fibers ............................................... 12 O 4: High power supercontinuum generation in tapered photonic crystal fibers ............. 13 O 5: Gas-Based Nonlinear Optics in Photonic Crystal Fibres ......................................... 14 O 6: Loss of phase in continuations of the NLS beyond the singularity .......................... 15 O 7: Derivation and analysis of various NLS-type equations from Maxwell equations .... 16 O 8: Optical focusing for monochromatic scalar and electromagnetic waves ................. 17 O 9: Nonlinear modes and beam amplification in PT-symmetry parabolic potential ....... 18 O 10: Taking the fast lane on laser acceleration ............................................................... 19 O 11: Quasi-cylindrical PIC modelling of laser interaction with low density plasmas ........ 20 O 12: Electron acceleration from ultraintense laser-plasma interaction ............................ 21 O 13: Novel property of laser-plasma interaction, namely the capability of acting as a

source of high energy and high brightness neutral and negative ion beams........... 22 O 14: Ion acceleration driven by ultra-intense, high contrast laser pulses ........................ 23 O 15: Time-delays in ionization: real, imaginary, and imagined ......................................... 24 O 16: Higher-order Kerr terms vs. plasma: Saturation of the nonlinear refractive index ... 25 O 17: Attosecond lighthouses: A new tool for ultrafast science and metrology ................. 26 O 18: Modelling intense laser-plasma processes – Bridging the gap between microscopic

and macroscopic phenomena ................................................................................. 27 O 19: High-harmonic generation at 200 kHz repetition rate .............................................. 28 O 20: Simulation of stimulated Brillouin scattering in the case of a non-monochromatic

pump wave .............................................................................................................. 29 O 21: Collective stimulated Brillouin scatter ...................................................................... 30 O 22: When a (seemingly) simple LPI problem leads to interesting questions in statistical

field theory .............................................................................................................. 31 O 23: SBS in the strong coupling regime. Short pulse amplification and plasma

characterization ....................................................................................................... 32 O 24: Raman compression of long laser pulses to picosecond duration for fast-ignition

fusion and high energy density physics................................................................... 33 O 25: Filamentation science in air ..................................................................................... 34 O 26: Single-cycle infrared pulse formation in the femtosecond filament ......................... 35 O 27: Holistic approach to models of non-linear optical response on femtosecond time-

scales ...................................................................................................................... 36 O 28: Propagation dynamics of ultraintense femtosecond optical vortices in air .............. 37 O 29: Frequency-angular spectrum under filamentation of chirped femtosecond pulses in

fused silica .............................................................................................................. 38 O 30: Overview of LMJ and PETAL projects .................................................................... 39 O 31: Equation of state and Rayleigh-Taylor growth experimental studies of Ge-doped CH

ablator ..................................................................................................................... 40 O 32: Laboratory astrophysics with high power lasers ...................................................... 41 O 33: Instabilities in Supernova remnants ........................................................................ 42 O 34: Laser-driven particle acceleration in Jena, Germany .............................................. 43 O 35: Electron dynamics in ultra-relativistic laser fields and the effects of the radiation

reaction force .......................................................................................................... 44 O 36: Femtosecond laser-plasma interaction with prepulse-generated liquid metal

microjets .................................................................................................................. 45


WLMI-2012

O 37: Dielectric function measurements of nonequilibrium warm dense matter using Fourier domain interferometry ................................................................................ 46

O 38: Investigation of hard X-ray free electron laser heated foils ..................................... 47 O 39: Fourier mode dynamics for the nonlinear Schrödinger equation in one-dimensional

bounded domains ................................................................................................... 48 O 40: Some variants of the focusing NLS equations. Derivation, justification and open

problems ................................................................................................................. 49 O 41: Investigation of exact solutions of a coupled Kerr-SBS system .............................. 50 O 42: Modeling Coulomb interactions in a quantum dot Bloch model .............................. 51 O 43: Time-dependent ionization models designed for intense and short laser pulse

propagation in dielectric materials .......................................................................... 52 O 44: Recent advances in ESTHER code ........................................................................ 53 O 45: Laser processing with ultrashort vortex pulses ....................................................... 54 O 46: Self-organization of dissipationless solitons in positive- and negative-refractive-

index materials and spontaneous generation of novel vortex solitons .................... 55 O 47: Soliplasmon dynamics and nonlinear excitation of surface plasmon resonances .. 56


WLMI-2012

Posters contributions P 1: Refractive Indices and Coherence Length of High Harmonic Generation Source in

Argon ...................................................................................................................... 57 P 2: Fundamental and higher order solitons in couplers with parity-time symmetry ....... 58 P 3: Extreme coherent contrast: measurement and control ........................................... 59 P 4: Modeling the Intense Ultra-Short Laser Pulse Filamentation. Multiple Foci and

Diffraction Rays ....................................................................................................... 60 P 5: Direct laser surface nanostructuring without material melting ................................. 61 P 6: IR shifted components control under collimated femtosecond beam filamentation . 62 P 7: Discrete multivortex solitons in photorefractive media ............................................ 63 P 8: Two electron beams acceleration in the laser wakefield accelerator ...................... 64 P 9: Energy deposition in femtosecond laser inscription revisited .................................. 65 P 10: Direct laser-writing in photosensitive glasses: Correlative microscopy of fluorescent

silver clusters and the associated space charge separation ................................... 66 P 11: Detailed x-ray measurements of gold hohlraum in the spectral range 2-80 keV ..... 67 P 12: Space- and time-resolved investigation of laser plasma instabilities driven by the

interaction of one or two ps pulses at moderate intensities ..................................... 68 P 13: Strong Field Approximation extended to nonhomogeneous fields .......................... 69 P 14: Spectral intensity map of supercontinuum under femtosecond near IR pulse

filamentation in fused silica ..................................................................................... 71 P 15: New Padé approximants for the derivative of plasma dispersion function Z' in the

complex plane ......................................................................................................... 72 P 16: Enhenced blue-shifted supercontinuum in the femtosecond laser filamentation of

argon with non-uniform density distribution ............................................................. 73


WLMI-2012

O 1: New results in rogue wave theory


WLMI-2012

O 2: Rogue Waves in Multifilaments


WLMI-2012

O 3: Accelerated rogue waves generated by soliton fusion at the advanced stage of supercontinuum formation in photonic crystal fibers


WLMI-2012

O 4: High power supercontinuum generation in tapered photonic crystal fibers


WLMI-2012

O 5: Gas-Based Nonlinear Optics in Photonic Crystal Fibres


WLMI-2012

O 6: Loss of phase in continuations of the NLS beyond the singularity


WLMI-2012

O 7: Derivation and analysis of various NLS-type equations from Maxwell equations

D. Lannes ENS Ulm, Paris, France

We will show in this talk how to derive various NLS-type equations starting from Maxwell equations. These equations will be rigorously justified and error estimates with respect to the solution of the full Maxwell equations will be provided. We will then sketch a mathematical analysis of some of these variants of the standard focusing NLS equation. Our goal is to understand the contribution of these modifications brought to the standard model near self focusing. The physical effects taken into account by these modifications include for instance saturated nonlinearity, self-steepening, group velocity dispersion, ionization etc.


WLMI-2012

O 8: Optical focusing for monochromatic scalar and electromagnetic waves


WLMI-2012

O 9: Nonlinear modes and beam amplification in PT-symmetry parabolic potential


WLMI-2012

O 10: Taking the fast lane on laser acceleration


WLMI-2012

O 11: Quasi-cylindrical PIC modelling of laser interaction with low density plasmas


WLMI-2012

O 12: Electron acceleration from ultraintense laser-plasma interaction


WLMI-2012

O 13: Novel property of laser-plasma interaction, namely the capability of acting as a source of high energy and high brightness neutral and negative ion beams


WLMI-2012

O 14: Ion acceleration driven by ultra-intense, high contrast laser pulses


WLMI-2012

O 15: Time-delays in ionization: real, imaginary, and imagined


WLMI-2012

O 16: Higher-order Kerr terms vs. plasma: Saturation of the nonlinear refractive index


WLMI-2012

O 17: Attosecond lighthouses: A new tool for ultrafast science and metrology


WLMI-2012

O 18: Modelling intense laser-plasma processes – Bridging the gap between microscopic and macroscopic phenomena


WLMI-2012

O 19: High-harmonic generation at 200 kHz repetition rate


WLMI-2012

O 20: Simulation of stimulated Brillouin scattering in the case of a non-monochromatic pump wave


WLMI-2012

O 21: Collective stimulated Brillouin scatter


WLMI-2012

O 22: When a (seemingly) simple LPI problem leads to interesting questions in statistical field theory


WLMI-2012

O 23: SBS in the strong coupling regime. Short pulse amplification and plasma characterization


WLMI-2012

O 24: Raman compression of long laser pulses to picosecond duration for fast-ignition fusion and high energy density physics


WLMI-2012

O 25: Filamentation science in air


WLMI-2012

O 26: Single-cycle infrared pulse formation in the femtosecond filament

O.G. Kosareva1, N.A. Panov1, V.A. Andreeva1, A.P. Shkurinov1, A.B. Savel’ev1 and S.L.Chin2 1 International Laser Center, Dept. of Physics, Lomonosov Moscow State University, Moscow, Russia.

2 Center for Optics, Photonics and Laser (COPL), Laval University, Quebec City, Qc G1V 0A6, Canada.

Femtosecond pulse localization in gases creates a novel medium for the development of the nonlinear processes and generation of new frequencies [1,2]. Scheme for tunable ultrashort pulse generation from the filament was suggested in [3], where 15 fs pulses in the visible range were obtained. Numerical simulations of four-wave mixing in the filament was performed in [4]. Far infrared pulses were experimentally obtained in [5] and with a powerful laser by Theberge et al in [6] by launching together pulses with and 2 central frequencies. Numerical simulations of terahertz pulse generation from the overlap of the fundamental and the second harmonic of Ti:Sap laser was reported in [7]. Duration of self-compressed femtosecond laser pulses in the filament at the fundamental laser frequency is 2 – 3 oscillations of the light field or 5 – 8 fs for the radiation of Ti:Sa laser system (800 nm) [1,2,4,8]. In this paper we perform numerical simulations of few – cycle pulse generation with tunable central wavelength by means of mixing the powerful pump radiation with relatively weak seed radiation. If the seed pulse has the central wavelength in the range 420 – 490 nm, it is possible to generate signal pulse with the period of 7 – 28 fs. We show that the duration of the signal (four-wave mixed) pulse is determined by the duration of the compressed pulse in the filament and that it is possible to produce single-cycle infrared pulses. To simulate the four-wave mixing in the filament, we use the approach based on the full electric field description, taking into account the carrier frequency [1,9] (Fig.1). The details of spatio-temporal characteristics of the electric field in the filament are presented. We thank Canada Research Chair, Russian Foundation for Basic Research (grants #12-02-01368a, #11-02-12061-ofi-m-2011), the President of the Russian Federation Grant for Support of Scientific Schools No. 6897.2012.2, the President of the Russian Federation Grant for Support of Young Scientists MK-2213.2010.2.

1. L. Bergé, S. Skupin, R. Nuter, J. Kasparian, J-P Wolf., Rep. Prog. Phys. 70 (2007) 1633. 2. S. L. Chin, Femtosecond Laser Filamentation: New York: Springer + Science + Business Media, (2010) 3. F. Theberge, N. Akozbek, W.W. Liu, A. Becker, S.L. Chin, Phys. Rev. Lett. 97, 023904 (2006) 4. L. Berge and S. Skupin, PRL 100, 113902 (2008) 5. T. Fuji, T. Suzuki, Optics Letters 32, 3330 (2007). 6. F. Théberge, M. Châteauneuf, G. Roy, P. Mathieu, J. Dubois, Phys. Rev. A 81, 033821 (2010). 7. I. Babushkin,W. Kuehn, C. Köhler, S. Skupin, L. Bergé, K. Reimann, M. Woerner, J. Herrmann, and T. ElsaesserPhys. Rev. Lett. 105, 053903 (2010). 8. D. Uryupina, M. Kurilova, A. Mazhorova, N. Panov, R. Volkov, S. Gorgutsa, O. Kosareva, A. Savel'ev, S.L. Chin, Journ. Opt. Soc. Am. B 27, 667 (2010). 9. M. Kolesik, J.V. Moloney, Phys. Rev. E 70, 036604 (2004).

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Fig.1. Two-cycle infrared pulse centered at 2200 nm generated from 800 nm 50 fs 1 mJ pump pulse and 1 J 450 nm seed pulse in argon filament.


WLMI-2012

O 27: Holistic approach to models of non-linear optical response on femtosecond time-scales


WLMI-2012

O 28: Propagation dynamics of ultraintense femtosecond optical vortices in air

Author: Pavel Polynkin Address: College of Optical Sciences, University of Arizona, 1630 E.

University Blvd., Tucson, Arizona 85721, USA Email: [email protected] Title: Propagation dynamics of ultraintense femtosecond optical vortices

in air Abstract: I will discuss the results of recent experiments on self-focusing dynamics and filamentation of ultraintense femtosecond optical vortex beams in air. These beams are of interest because they are good candidates for the generation of extended bottle-like distributions of plasma filaments in the atmosphere which can be used for guiding microwave radiation. Our results show that the azimuthal modulation instability breaks vortex intensity rings into filaments, the number of which grows with the input laser power. The entire filament pattern rotates on propagation at a rate consistent with the orbital momentum conservation.


WLMI-2012

O 29: Frequency-angular spectrum under filamentation of chirped femtosecond pulses in fused silica


WLMI-2012

O 30: Overview of LMJ and PETAL projects


WLMI-2012

O 31: Equation of state and Rayleigh-Taylor growth experimental studies of Ge-doped CH ablator

G. Huser1, B. Loupias, B. Villette, G. Salin, C. Starrett, V. Recoules, S. Mazevet CEA/DAM Ile de France, Bruyères-le-Chatel N. Ozaki, K. Miyanishi, N. Yokoyama, H. Uranishi, Y. Asumi, M. Kita, Y. Kondo, T. Yang Osaka University, Graduate School of Engineering T. Sano Osaka University, Institute of Laser Engineering We are currently investigating ways at CEA to reduce hydrodynamic instabilities (RTI) in ICF capsules. Several designs are now being tested experimentally in order to reduce RTI at the ablation front and at the pusher/fuel interface. The ablator material that is used is Ge-doped CH. After reminding the use of a mid-Z dopant for capsule physics, we present the experimental work that has been recently conducted at CEA in the field of ablator material physics. Rayleigh-Taylor growth studies were performed through integrated experiments at the Omega laser facility at the University of Rochester. Two designs were studied: the laminated ablator was proved to stabilize the ablative RTI and we are now working on the stabilization of the pusher-fuel interface using a graded dopant design. In parallel, we are pursuing more fundamental studies such as equation of state and microscopic properties studies of CHOGe mixtures. Such studies are necessary in order to input accurate physical data into 2D hydro simulations. To this extent, we have started a collaborative research with the University of Osaka. We will present recent CHOGe Hugoniot results obtained on the GekkoXII laser facility at the Institute of Laser Engineering.

1 [email protected]


WLMI-2012

O 32: Laboratory astrophysics with high power lasers


WLMI-2012

O 33: Instabilities in Supernova remnants

S. Bouquet CEA/DAM Ile de France, Bruyères-le-Chatel, France

The explosion of a massive star (its mass should be larger than 3 times the Solar mass, at least) produces the so-called "supernova (SN)" phenomenon. The ejecta (plasma ejected by the explosion of the star) of the SN expands first in the circumstellar medium (CSM) and then in the interstellar medium (ISM). The whole system correspond to a supernova remnant (SNR). As the velocity of the ejecta can be as high as 10 000 km/s, a very strong shock is generated that interacts with the CSM and ISM where it propagates over several thousands years. The SNR experiences several stages with mainly two kinds of instabilities, namely, Rayleigh-Taylor and Vishniac instabilities. These stages togther with the associated instabilities will be presented.


WLMI-2012

O 34: Laser-driven particle acceleration in Jena, Germany


WLMI-2012

O 35: Electron dynamics in ultra-relativistic laser fields and the effects of the radiation reaction force


WLMI-2012

O 36: Femtosecond laser-plasma interaction with prepulse-generated liquid metal microjets


WLMI-2012

O 37: Dielectric function measurements of nonequilibrium warm dense matter using Fourier domain interferometry


WLMI-2012

O 38: Investigation of hard X-ray free electron laser heated foils

P. Audebert1, A. Lévy1, R. Shepherd2, J. Dunn2, M. Cammarata7, O. Ciricosta3, F. Deneuville4, F. Dorchies4, M. Fajardo5, C. Fourment4, D. Fritz7, J. Fuchs1, J. Gaudin6, M. Gauthier1, A. Graf2, J.

Park2, A. Steel2, S. Vinko3, J. Wark3, G. Williams5 and R.W. Lee2

1Laboratoire pour l’Utilisation des Lasers Intenses, UMR7605, CNRS-CEA-Université Paris VI-Ecole Polytechnique, 91128 Palaiseau, France 2Lawrence Livermore National Laboratory, Livermore, CA 94551, USA

3Department of Physics, Clarendon Laboratory, University of Oxford, Oxford OX13PU, UK 4Université de Bordeaux – CNRS – CEA, Centre Lasers Intenses et Applications (CELIA), Talence, F-33405 France 5Instituto Superior Técnico, Av Rovisco Pais 1, 1049-001 Lisboa, Portugal 6European XFEL GmbH, Notkestrasse 85, 22607 Hamburg, Germany

7SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025, USA

We report a recent experiment performed on the hard x-ray beamline (X-ray Pump Probe-XPP) at the Stanford Linac Coherent Light Source (LCLS) free electron laser devoted to the study of high-pressure high-energy density (HED) states. This regime of matter, hardly describes by the theoretical models, is poorly known due to the difficulty of achieving these conditions experimentally. The development of free electron laser instruments opens a unique opportunity to generate this regime in laboratory as it allows to efficiently and uniformly heat the matter up to ~ 5 eV in a ultra-short short duration under 100 fs. Such an experiment is of primary importance since this regime is involved in a large panel of research areas ranging from planetology to inertial fusion. In this context, we irradiated 0.5-4 µm thick foils of Ag and Cu with a 9 keV x-ray beam of 60 fs duration and focused using beryllium lense to an irradiance approaching 1016 Wcm-2. The sample temporal evolution was monitored with two Fourier Domain Interferometry diagnostics measuring the phase and amplitude of an optical laser beam reflected on each side of the target. Such a measurement will provide information as well on the heating uniformity and conductivity properties as on the relaxation processes of a sample submitted to an x-ray ultrafast heating leading to a highly non equilibrium state.


WLMI-2012

O 39: Fourier mode dynamics for the nonlinear Schrödinger equation in one-dimensional bounded domains


WLMI-2012

O 40: Some variants of the focusing NLS equations. Derivation, justification and open problems


WLMI-2012

O 41: Investigation of exact solutions of a coupled Kerr-SBS system


WLMI-2012

O 42: Modeling Coulomb interactions in a quantum dot Bloch model


WLMI-2012

O 43: Time-dependent ionization models designed for intense and short laser pulse propagation in dielectric materials


WLMI-2012

O 44: Recent advances in ESTHER code

Laurent Videau, Patrick Combis CEA, DAM, DIF, F-91297 Arpajon, France

[email protected] We will present recent advances in the one-dimensional Lagrangian ESTHER code which is devoted to study the matter evolution coupled with different energetic sources (laser, ions, X-ray …). The code is able to simulate the matter from solid phases to plasma conditions and takes into account basic physical models like hydrodynamic evolution, elastoplasticy, thermal heat and radiative transfer. We have recently implemented and tested new physical models we propose to describe here. We first have implemented different spall models for ductile materials (Kanel(1) and Johnson(2) one’s) based on porosity calculations coupled with a threshold value. Voids with zero pressure are included when the porosity is locally above the threshold. We have compared these models with data free surface velocity measurements obtained during a laser-matter experiment on ALISE facility. We have also implemented a phase transition kinetic model for different materials based on the Hayes equation(3). We have tested this module with experimental data(4) and shown kinetic phase transition effects on the shock-induced shape and the free surface velocity. The second main code evolution is related to short pulse laser interaction when ion and electron temperature are different. We have extended a bi-temperature model(5) allowing us to describe the coupling between electron and ion populations. We will present results for dielectric materials.

(1) G.I. Kanel et al (1987) Advanced Mechanics (10) (2) Johnson J.N. (1981) Dynamic Fracture and spallation in ductile solids, J Appl

Phys. (4) 52 (3) D.B. Hayes, J. Appl. Phys., 46 (1975) (4) T. de Resseguier et al (2008), Phys. Rev. B 77, 174107 (2008) (5) J.P. Colombier, Jean Monnet University thesis, France (2005)


WLMI-2012

O 45: Laser processing with ultrashort vortex pulses

C. Hnatovsky, V. Shvedov, A. V. Rode, W. Krolikowski, Laser Physics Centre, Research School of Physics and Engineering, The Australian National University, Canberra ACT 0200, Australia

We study experimentally material modification by using tightly focused single femtosecond laser vortex pulses. Double-charge femtosecond vortices were synthesized with a vortex beam converter [1] by using polarization singularities associated with the beam propagation in birefringent crystals. A vortex beam was focused using moderate and high numerical aperture optics (viz., NA = 0.45 and 0.9) to ablate fused silica and soda-lime glass. By controlling the pulse energy we consistently machine micron-size ring-shaped structures with down to 70 nm uniform groove thickness with single-pulse irradiation. By focussing the vortex beam in the bulk of transparent material to the intensity above the optical breakdown threshold we demonstrate the ability to form a toroidally shaped plasma confined inside the solid. Our preliminary experiments with powerful femtosecond vortex beam demonstrate that the central volume of the cylindrical focus with zero intensity in the axis is indeed heated in the centre of the beam above the ablation threshold. Using the pulse energy below the ablation threshold and irradiating the same spot on the surface with many, up to 1000 pulses, we demonstrate formation of nanostructured patterns which accurately replicate the vectorial structure of laser field of tightly focused beams and provide insights into the directionality of radiation pressure in the nanoscale domain. These complex polarisation-replicating nanostructures may find applications in the fabrication of polarization micro-optic components and beam shapers, and in the synthesis of chiral materials.


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O 46: Self-organization of dissipationless solitons in positive- and negative-refractive- index materials and spontaneous generation of novel vortex solitons

V. Skarka1,2 and N. B. Aleksic2

1Laboratoire de Photonique d’Angers, Université d’Angers, 2, Boulevard Lavoisier, 49045 Angers, France

2Institute of Physics, Pregrevica 118 Belgrade, Serbia

e-mail: [email protected]

A localized laser pulse becomes a dissipationless soliton whenever the loss is compensated by the gain and simultaneously the diffraction and dispersion are balanced by the saturating nonlinearity. We developed the dissipative variational method in order to find steady state solutions of complex cubic-quintic Ginzburg-Landau equation that describe well dissipative solitonic structures of one, two, and three dimensions. A stability criterion is established rendering a large domain of dissipative parameters [1]. The opportunity to treat analytically and numerically asymmetrical input pulses propagating toward necessarily stable and robust dissipationless light bullets opens possibilities for diverse practical applications including experiments [2].

A generalized Ginzburg-Landau equation describing a dissipationless solitons dynamics in negative-refractive-index materials is derived from Maxwell equations. This equation having only real terms with opposite sign differs from the usual Ginzburg-Landau equation for positive-refractive-index media. A cross-compensation between the saturating nonlinearity excess, losses, and gain makes obtained self-organized solitons dissipationless and exceptionally robust. In the presence of such solitons medium becomes effectively dissipationless. The compensation of losses is of particular interest for media with resonant character of interactions like negative-refractive-index materials [3].

We consider also the model of the light transmission in nonlinearly amplified bulk media, taking into account the localization of the gain, i.e., the linear loss shaped as a parabolic function of the transverse radius, with a minimum at the center. The balance of the transverse diffraction, self-focusing, gain, and the inhomogeneous loss provides for the stabilization of vortex solitons, in a large zone of the parameter space. Adjacent to it, stability domains are found for several novel kinds of localized vortices, including spinning elliptically shaped ones, eccentric elliptic vortices which feature double rotation, spinning crescents, and breathing vortices [4]. References [1] V. Skarka, and N.B. Aleksic, Phys. Rev. Lett. 96, 013903 (2006). [2] N.B. Aleksic, V. Skarka, D. V. Timotijevic, and D. Gauthier, Phys. Rev. A 75, 061802(R) (2007). [3] V. Skarka, N.B. Aleksic, and V.I. Berezhiani, Phys. Rev. A 81, 045803 (2010). [4] V. Skarka, N.B. Aleksic, H. Leblond, B.A. Malomed, and D. Mihalache, Phys. Rev. Lett. 105, 213901 (2010).


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O 47: Soliplasmon dynamics and nonlinear excitation of surface plasmon resonances


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P 1: Refractive Indices and Coherence Length of High Harmonic Generation Source in Argon


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P 2: Fundamental and higher order solitons in couplers with parity-time symmetry


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P 3: Extreme coherent contrast: measurement and control


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P 4: Modeling the Intense Ultra-Short Laser Pulse Filamentation. Multiple Foci and Diffraction Rays

Yu.E. Geints, A.D. Bulygin, and A.A. Zemlyanov Zuev Institute of Atmospheric Optics SB RAS,

Zuev Square 1, Tomsk, 634021, Russian Federation, e-mail: [email protected]

Abstract

We present a fresh outlook on the problem of ultra-short laser pulse self-focusing and

filamentation when propagating in air. Two well-known qualitative physical models of optical pulse

filamentation scenario, the dynamic multiple focusing, and the wave-guiding models, are

considered and partially revisited. In terms of the averaged (effective) laser beam radius, the

filament is treated as a net product of layer-by-layer (in time) self-focusing of separate temporal

pulse slices. This means that the evolution of the effective radius of every pulse temporal layer is

characterized by the formation of its own local nonlinear focus at a certain point of the optical path.

The temporal slices at the pulse center and at the trailing edge have the smallest size of local focal

waist, while the slices at the pulse front edge are characterized by the largest size of the focal waist.

The sequence of local focal spots produced by individual temporal slices forms an extended beam

waist of a variable diameter, which is just referred to as the light filament.

By means of the developed time-averaged diffraction ray tracking technique, the crucial role

of the diffraction effects in the formation of a light filament and following a low-divergent light

channel near the beam axis is revealed. As the filamentation starts, two characteristic ray families

are formed in the beam: (a) the paraxial part, whose angular divergence after the exit of

filamentation zone is smaller than the diffraction-limited one, and (b) the periphery part with the

characteristic divergence corresponding to the divergence of the laser beam as a whole after the

passage of nonlinear focus. The latter ray family is characterized by the presence of annular patterns

in the transverse fluence profile. The fluence distribution in the paraxial ray family is close to the

Gaussian, and the power carried by this channel is smaller than the critical power for self-focusing.


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P 5: Direct laser surface nanostructuring without material melting


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P 6: IR shifted components control under collimated femtosecond beam filamentation


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P 7: Discrete multivortex solitons in photorefractive media


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P 8: Two electron beams acceleration in the laser wakefield accelerator


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P 9: Energy deposition in femtosecond laser inscription revisited


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P 10: Direct laser-writing in photosensitive glasses: Correlative microscopy of fluorescent silver clusters and the associated space charge separation


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P 11: Detailed x-ray measurements of gold hohlraum in the spectral range 2-80 keV

P. Renaudin CEA/DAM Ile de France, Bruyères-le-Chatel, France

X-ray spectroscopic measurements in the spatial range 2-80 keV have been obtained at University of Rochester. The studied plasmas were created in gold hohlraum filled with 1 bar of Methane with the Omega laser. Spectra analysis of L- and M-band emission as well as bremsstrahlung emission allow to infer average electronic temperature of the ionized gold plasmas and the total energy of the reflected light. The same conditions of temperature and density are used to calculate the L- and M-band emission with the NLTE atomic-physics code FLYCHK. Experimental data and atomic physics calculations with FLYCHK will be presented and discussed.


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P 12: Space- and time-resolved investigation of laser plasma instabilities driven by the interaction of one or two ps pulses at moderate intensities


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P 13: Strong Field Approximation extended to nonhomogeneous fields


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P 14: Spectral intensity map of supercontinuum under femtosecond near IR pulse filamentation in fused silica


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P 15: New Padé approximants for the derivative of plasma dispersion function Z' in the complex plane


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P 16: Enhenced blue-shifted supercontinuum in the femtosecond laser filamentation of argon with non-uniform density distribution


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Notes

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