«Damageless optics» / C3 meeting Julien Fuchs, LULI/CNRS & Ecole Polytechnique, julien.fuchs@polytechnique.fr Main goals: -Progress on C3 research areas -Update on workpackage progress -Proposals Main lines of C3: C3 = the way to deliver the highest power laser of the IZEST project SRS SBS 1
Presentation of present state of C3 workpackages organization Participants C3 WP1 - Managemen t WP2 - Plasma mirrors, incl. Contrast cleaning WP3 - Amplificatio n SBS WP4 - Amplification SRS WP5 - Selfcompression and diagnostics WP6 - OPCPA WP7 - Targets WP Leaders J Fuchs XX L Lancia D Jaroszinsky J Wheeler Ruxin Li N Fisch Contact point 1 - IZEST J Fuchs 1 1 1 1 2 - HHU O. Willi 1 1 1 3 - Strathclyde D. Jaroszinsky 1 1 1 1 1 4 - CEA-DAM J.L. Miquel 1 1 5 - CEA-IRAMIS M. Quinn 1 1 6 - U. Roma L. Lancia 1 7 - Princeton N. Fisch 1 1 8- GSI V. Bagnoud 1 1 1 1 9 - SIOM R. Li 1 10 - NIZHNY A. Sergeev NOVGOROD 1 1 11 - CUOS K. Krushelnick 1 12 - Osaka U. T. Hosokai 1 13 - INRS XX 1 1 14 - AUSTIN T. Ditmire 1 1 Topics (WP) covered by C3 WP4, SRS amplification (D. Jaroszynski, status: ongoing) WP3, SBS amplification (L. Lancia, status:completed) WP7, Targets (N. Fish, status: ongoing) WP5, Self-compression & Diagnostics (J. Wheeler, status:completed) WP2, Plasma mirrors (XX, status: ongoing) WP6, OPCPA generation of high-power pulses at high rep. rate (R. Li, status: ongoing) 2
C3 scientific document outline Abstract Partners Concept and objectives, progress beyond state-of-the-art, S/T methodology II.1 Concept and project objective(s) II.2 Progress beyond the state of the art II.3 S/T methodology II.3.1 Overall strategy and general description II.3.2 Work package list /overview II.3.3 Work package descriptions II.3.4 Deliverables list II.3.5 List of milestones and planning of reviews Resources to be committed Overall timeline References After the WkShop, we need to start outlining the document using the WP sheets C3 workpackages description: example 3
What lays ahead Complete WPs statements C3 document May 2013 Joint proposals LP3 ongoing (partners: Dusseldorf, CEA-DAM, Strathclyde, Polytechnique) USAF (coupled to US groups) In-country & EU/international proposals Proposals 4
WPs breakdown WP2 Plasma mirrors J.C. Kieffer, INRS, kieffer@emt.inrs.ca Main point: if we can succesfully transfer energy from a 10 ps pulse to a 10s of fs pulse, we ll do that in a relatively small transverse size beam Solid-state optics having a conventional damage threshold will be extremely large Going to plasma mirrors would be the solution Need to test PM in such conditions 5
Reflectivity 3/29/2013 Perspective: plasma focusing could be used for extreme power light M. Streeter et al., NJP 13 023041 (2011) w Relativistic Plasma mirror 10 20 W.cm -2 2w 10 KJ / 10 fs Intensity Reflectivity goes up Harmonics focusing High-order harmonic generation from curved surface Harmonic focusing Smaller spot/ shorter pulse Even higher focused intensity Path forward Experiments to perform at ultra-short laser pulses facility (INRS or others) : modify fluence on PM and study behaviour of PM, reflected pulse, wavefront. Short pulse (10s of fs) and high intensity (10 18-10 20 W.cm 2 ). GSI: mid-scale experiments in the many-10-joule regime *present status: GSI has some experience with single plasma-mirror setup and its characterization *planned deliverables: Development of a setup for imaging the laser focus after a plasma mirror on full energy shots (10-50 J) Test of spherical/aspherical plasma mirrors *milestones: Validation of the above deliverables - Timeline is TBD (depends on the need of the work package) - Our internal goal is to have done some scaling experiments until end 2014 6
Timeline & milestones J.C. Kieffer, INRS, kieffer@emt.inrs.ca WP2 - Plasma mirrors 2013: experiment at INRS or others; modify fluence on PM and study behaviour of PM, reflected pulse, wavefront. Diagnostics: reflected energy. wavefront of reflected pulse & imaging of focused spot. spectrum of pulse. how is the plasma behaving (TASRI). generated harmonics. 2014: GSI; mid-scale experiments in the many-10-joule regime WP3 Amplification SBS L. Lancia, livia.lancia@uniroma1.it / Stefan Weber, stefan.weber@luli.polytechnique.fr 7
11/2012 8
2013: GSI / HHU 2014: L-FEX/ Omega-EP /SG-III access? 2015 PETAL SBS amplification experimental facilities LULI: 10 J / 300 fs 2 beams experiment ongoing 11/2012, proposal for 2013 HHU: 5 J / 30 fs 2 beams planned experiment in Spring 2013 GSI: Planned deliverables: Demonstration Experiment at the 100 J level on the PHELIX facility Milestones: Writing access proposal for PHELIX (14 th Dec 2012) Getting approval for beamtime access at PHELIX in 2013/2014 (Jan 2013) Experiment layout (plasma beam, pump and seed) (spring 2013) First experiment (according the PHELIX plan: June 2013/May 2014) UT (Austin): 150 J / 150 fs TBD Petal: Glass laser 1-3.5 kj 2015 + onwards 9
Timeline & milestones L. Lancia, livia.lancia@uniroma1.it / Stefan Weber, stefan.weber@luli.polytechnique.fr WP3 - Amplification SBS experiments on optimization (profile, etc) GSI / UT / HHU/ WP4 Amplification SRS D. Jaroszynski, dino@phys.strath.ac.uk 10
Dynamic chirped grating compressor ω p ω pump ω seed Energy and momentum is conserved w w w pump seed p k k k pump seed p Compton regime w w w w p b 2 0 1aa 0 1 Chirped pulse Raman amplification Linear RBS Exponential growth Narrow bandwidth limited to Temporal broadening Chirped Pulse tapered plasma density RBS Constant gain Seed frequencies amplified at different longitudinal positions Not suitable for short pulse amplification No temporal broadening Superradiant scaling Suppress spontaneous scattering Compton regime for high probe intensities: bounce frequency greater than plasma frequency superradiant scaling 11
Previous measurements by Strathclyde group Gain of 10 6 10 7 demonstrated Demonstration of CPA using Raman scattering Spontaneous back-scatter a problem at high pump fluence need chirped pulses or tapered density plasma media Plasma media: waveguides and gas jets Competing effects: Spontaneous backscattering, Landau damping, filamentation of pump and wavebreaking need to choose regime well Need to increase efficiency BRA and Compton Experimental Facilities Strathclyde: Ti:sapphire system: SCAPA GSI: Glass laser 1 kj LULI: Glass laser 1 kj Petal: Glass laser 1-3.5 kj Will also apply for beam time at RAL Need to develop OPCPA at correct wavelength for RBS and Compton 12
BRA/Compton Timeline: D. Jaroszynski, dino@phys.strath.ac.uk 2012/2013 demonstrate higher efficiency with 1-100 J laser 2013/2014 develop high energy probe shifted by plasma frequency 2014/2015 demonstrate ultra-short pulse Compton and Raman pump depletion regimes 2013-2015 develop plasma media 2013-2015 study transverse effects 2014/2015 demonstrate high energy regime 1-3 kj pump 2014 combine two beams using BRA WP5 Self-compression M. Quinn, IZEST, mark.quinn@cea.fr 13
Timeline & milestones WP5 - Self-compression 2013: investigation using SPIDER of self-compression in underdense plasma @ CEA-Saclay WP6 OPCPA Yuxin Leng, lengyuxin@mail.siom.ac.cn, Ruxin Li, ruxinli@mail.siom.ac.cn 14
Optical parametric chirped pulse amplification Chirped Pulse Amplification: Laser material: Ti:Sapphire, Nd:glass for broadband gain. Parametric Pulse Amplification (OPA): Nonlinear crystal: BBO, LBO, KDP CPA+OPA=OPCPA (Optical parametric chirped pulse amplification) WP6 - OPCPA Timeline & milestones Yuxin Leng, lengyuxin@mail.siom.ac.cn, Ruxin Li, ruxinli@mail.siom.ac.cn 1992- OPCPA concept was mentioned and the first OPCPA experiment was carried out; 2001- now OPCPA has been used for ultra-intense laser development Full OPCPA laser 1TW, 10TW @ 1 micron with LBO or BBO or KDP; Near 1PW @ 910nm with DKDP; OPCPA combines with CPA 1 micron for Nd:glass laser; 800nm for Ti:sapphire laser (front end or main amplifiers with double CPA scheme); 2002-10TW OPCPA laser in SIOM 2006- PW CPA Ti:sapphire laser in SIOM 2012-2013 PW CPA Nd:glass laser (SG update project with OPCA as front end) in SIOM Plan: 2015-2016 Multi PW laser project Combining Ti:sapphire CPA & OPCPA based on PW & SG laser in SIOM 15
Multi PW laser project in SIOM Combining Ti:sapphire CPA & OPCPA based on PW & SG laser PW laser 1kHz fs laser Pulse cleaner Stretcher Ti:sapphire Regen Ti:sapphire amplifier I (10Hz) Accurate synchronization 20ns Nd:glass pump laser ~400mJ/50nm ~50J/50nm Ti:sapphire amplifier II Ti:sapphire amplifier III kj level/1~2ns Nd:glass pump laser 1-1.5kJ@527nm SG laser OPCPA amplifier Multi PW 30fs Grating pulse compressor AO 200-300J/50nm Big size of nonlinear crystal WP7 Targets: Nat Fisch (Princeton), fisch@pppl.gov IZEST Meeting (November 2012) Definitions of target: a. Target of focus b. Plasma coupler (topic of WP7) Target of focus Plasma coupler Malkin, Shvets and Fisch, PRL (1999) 16
Plasma Coupling Techniques 10 cm 100 m 1 cm RBS pancake-shaped plasma coupler for next generation power densities present high aspect ratio RBS coupling technology (gas jets, cylinders, capillaries) Issues in large Plasma Coupler 1. Sidescatter 2. Backscatter 3. Focusability Possible (uniform) Plasma Sources 1. Ionize droplets in magnetic field 2. Ionize foam 3. Gas bag Alternative is to focus many beams from high aspect-ratio couplers. 17
Timeline & milestones Nat Fisch (Princeton), fisch@pppl.gov WP7 Targets 1. Identification of leading technologies (already dome) a. Foils, foams, gas jets b. aerosols 2. Evaluate methodologies useful for different regimes a. Exploit group velocity dispersion with seed laser chirping See Toroker, Malkin and Fisch, PRL (2012) b. Exploit group velocity dispersion in relativistic nonlinearity regime (in preparation) 3. Scope main target parameters (1 year) a. Modeling of plasma couplers b. Explore aerosol regimes c. Downselect in different regimes WP8 Diagnostics J. Wheeler, IZEST, Jonathan.wheeler@cea.fr Participants CEA Saclay Mark Quinn, Jonathon Wheeler Strathclyde D. Jaroszinsky CEA DAM?? Austin T. Ditmire 18
Participants CEA Saclay Mark Quinn, Jonathon Wheeler Strathclyde D. Jaroszinsky CEA DAM?? Austin T. Ditmire Present Status @ CEA-Saclay Development at Saclay Sea-Spider Temp profile + 1D spatial Built and now testing 4fs, + spot imaging Sea-Tadpole Working.. Pulse front Curvation Muffin: muliple fibre & freq resolved interm. Sea Tadpole *5 No scanning needed single shot measurements Developing. 2014 19
Timeline & milestones J. Wheeler, IZEST, Jonathan.wheeler@cea.fr WP8 Diagnostics 2013: development in Saclay @ 800 nm 2014: application @ 1 µm 20