How far are we today from its availability?

Transcription

1 The 10 PW Ti-Sapphire based Lasers for the Romanian ELI NP Pillar How far are we today from its availability? Jean Paul Chambaret (ILE/ ENSTA)

2 How to compare ILE APOLLON and ELI with existing UHI lasers 1PW ~highest power laser today (Astra Gemini, Vulcan) W/cm² The most powerful installations ( TW) (Commercially available) I < W/cm² 200PW ELI The highest peak W /cm² power project 10PW Apollon (ILE) W /cm² Existing technology (validated)

3 ILE APOLLON 10P : A collaborative project between Several laboratories on the «Plateau de Saclay» ILE APOLLON Single beamline 10PW laser KHz Ti:Sa nm 500 µj synchronized Spectral broadening < nm 100 µj, khz Front End OPCPA Amplification stages LBO/BBO nm 100 mj, 1Hz Ampli 0 2J /1Hz Ampli 1 «LASERIX» 50J /0.1Hz Ampli 2 600J -1shot/mn Yb:KGW Diode pumped 300 fs, nm Amplis Yb:KGW Yb:YAG Diode pumped nm 1Hz Compression and SHG 1 à 100 ps nm 1 Hz Nd YAG 6J/1Hz Amplifiers Nd Glass 100J/0.1Hz Nd Glass 1.5KJ 1tr/mn DM2 DM1 150J / PW ϕ 200 mm ϕ 180 mm ϕ 520 mm G4 G1 ϕ 520 mm SF G3b G2 G3 Vacuum compression / spatial beam control G2b

4 ILE APOLLON 10P : the French ELI single beamline prototype ILE Front End fs khz Ti:Saphir nm 800 µj Synchronisation Spec. Broadening < nm 600 µj, khz XPW Cleaning 120µJ OPCPA Amplification stages (BBO ou LBO) nm 100 mj, 100-1KHz Laser fs Yb:KGW Diode pumped 300 fs, nm Amplis Yb:KGW and Yb:YAG Diode pumped nm KHz Compression and SHG ps nm KHz

5 MSOffice1 XPW spectral/temporal sub-5fs pulse cleaning (Collaboration with LOA-PCO group) ~600 µj >80 µj Spectra before/after XPW: Spectral cleaning with >13% overall efficiency (>20% for XPW) XPW pulse compression: Strehl ratio:73%, Main peak energy:92% 1.0 A fte r X P W (1 m m B a F 2 ~ 1 3 % ) 0.8 Intensity (a.u.) fs T im e (fs )

6 Slide 5 MSOffice1 We tried two different BaF2 crystals: 0.5 mm and 1 mm thick. Here we show that we can use 1 mm thick crystals to reach more than 13% overall efficiency (meaning after compression of the XPW pulses). However if the looses of the vacuum chamber windows, the TFP and the CM/wedges compressor are counte we reach an XPW efficiency more than 20% (25%theoretical for Gaussian pulses...). Compression of the XPW pulses has been also performed (measured with our single shot FROG just to verify that potential compressibility of such pulses...) resulted in about 5 fs pulses with much improved quality when compared to the HCF compressed pulses. This is mainly because of the spectral cleaning effec transforming the highly modulated spectrum of the HCF output to a nice Gaussian-like with about 200 nm bandwidth. We give here the temporal strehl ratio which has not improved compared to the HCF and the main peak energy content that has indeed improved (92 %!!!!). This is only due to the CM compression that is not optimized for the XPW pulses. I think the fair compression is on the main peak energy content that reveilles the clear spectral improvement., 2/19/2010

7 ILE APOLLON 10P : Bottleneck 1 : Yb doped Diode Pumped OPCPA Pump lasers ILE 10 PW Front End fs khz Ti:Saphir nm 800 µj Synchronisation Spec. Broadening < nm 600 µj, khz XPW Cleaning 120µJ OPCPA Amplification stages (BBO ou LBO) nm 100 mj, 100-1KHz Laser fs Yb:KGW Diode pumped 300 fs, nm Amplis Yb:KGW and Yb:YAG Diode pumped nm KHz Compression and SHG ps nm KHz Collaboration With MBI On thin disk Yb amplifiers

8 The ILE APOLLON 10P Front End ps/ns strategy Ti:Saphir nm 1.5 mj/1khz Optical synchronization Spectral broadening < nm 200 µj, khz Hollow fiber + XPW Glass stretcher > ps NOPCPA (x ) (BBO, LBO or BIBO) 1-2 stages > ps 100 mj, ~30 CM compr mj < nm 100Hz (to1khz) Strecher >500 ps Yb:KGW Regen. >500 ps, nm 3D MP Amp Yb:KGW (1030nm, 3.5nm) mj 100Hz Picosecond Stage DAZZLER Thin Disk Regen. Yb:YAG (1030nm, 3nm) mJ 100Hz Compr. ~50 ps SHG >50% Almost completed 20 nm Offner stretcher ns/nm 20-30% >6 nm Nanosecond Stage 3D MP Amplifiers (2-3) Yb:KGW and Yb:YAG ~3 ns, 2 J, 1030 nm,10hz SHG Thin Disk Amp Yb:YAG ~3 ns, 2 J, 1030 nm,100hz ~50% ~1 J, Offner stretcher ~1ns, ~30% Remains to be done! 3-6 NOPCPA (x30-50) (BBO, LBO or BIBO) 1-2 stages >100 mj ~1ns 800 nm 100Hz

9 ILE APOLLON 10P : the French ELI single line prototype alignement TiSa power amplifiers section alignement Amp-300: 1 tir/mn Diam= 170 mm E pompe = 600 J E entrée = 100 J E sortie = 300J Amp-30: 1 tir/mn Diam= 50 mm E pompe = 70 J E entrée = 3 J E sortie = 30J alignement Amp-3: 0.1 Hz 1 tir/mn? Diam = 22 mm E pompe = 10 J E entrée = 0.3 J E sortie = 3J λ/2 bloqueur bloqueur Amp-0.3: 10 Hz Diam = 6 mm E pompe = 1 J E entrée = 0.03 J E sortie = 0.3J Amp-100: 1 tir/mn Diam= 100 mm E pompe = 200 J E entrée = 30 J E sortie = 100J alignement 1 J alignement 1 er point d alignement

10 Bottleneck 2: Large size TiSa crystals *R&D in progress with CRYSTAL SYSTEMS based on HEM to grow size up to 8 Last result (July 2008) ILE #4 in the evaluation process. After processing, the boule diameter is 192 mm, and the height is 122 mm. *R&D with RSA Le Rubis (Fr) to grow TiSa crystals first up to ϕ 100mm, then to ϕ 200mm Kiropoulos growing process Today available : good optical quality 17cm in diameter TiSa disks (up to 5-7PW!) Déc er french crystal TiSa byr SA le Rubis For 10PW: 20cm in diameter TiSa disks required

11 ILE APOLLON 10P : the French ELI single line prototype alignement TiSa power amplifiers section alignement Amp-300: 1 tir/mn Diam= 170 mm E pompe = 600 J E entrée = 100 J E sortie = 300J Amp-30: 1 tir/mn Diam= 50 mm E pompe = 70 J E entrée = 3 J E sortie = 30J alignement Amp-3: 0.1 Hz 1 tir/mn? Diam = 22 mm E pompe = 10 J E entrée = 0.3 J E sortie = 3J λ/2 bloqueur bloqueur Amp-0.3: 10 Hz Diam = 6 mm E pompe = 1 J E entrée = 0.03 J E sortie = 0.3J Amp-100: 1 tir/mn Diam= 100 mm E pompe = 200 J E entrée = 30 J E sortie = 100J alignement 1 J alignement 1 er point d alignement

12 Bottleneck 3: High energy pump lasers for TiSa power amplifiers TiSa large pump lasers (ns) 200J of green /nanosecond (20-30ns) / single beamline, >1shot/mn Laurence Livermore Nat Lab Big international tender launched in January 2009 (4 years) called «Competitive dialog procedure» Today :Phase 3 prototype construction just launched! Hopefully demonstrated early next year, and available in

13 Bottleneck 4: Large size SHG crystals for pump lasers: LBO strategy (in collaboration with Cristal Laser) LBO type 1 Φ 65 mm e=12mm SHG record in LBO : More than 200 J on Alisé Laser at CEA E (1053nm) : 235J E(527nm) : 217J η= 92% June 2009 Input beam Top Hat 12ns, φ 53mm Huge R&D effort remains for commercial availability (back up D*KDP)

14 Bottleneck 5 : Diffractive Optical Elements as Homogenizers For large crystals, absolute need of smoothing techniques Nd:verre Pump beam Diffractive Optical Element courtesy Rutherford Appleton Laboratory SILIOS diffractive elements Implemented on Astra Gemini! Reasonable effort remains to be done for increased performances

15 ILE APOLLON 10P : Compression The Back up solution Gold Gratings : 1480 mm-1 940x750mm² LLNL grating Large dimension : 940 x 750 mm² 800 nm for broadband spectrum Limitation on damage threshold Max fluence on gratings: 0.2J/cm² D= 400mm R1 = 750 mm lamb0 = 800 nm alpha = 56 entrée beta0 = 20.8 (250 J) Sortie 10 PW (150 J, 15 fs) L = 1250mm 10pCpr_Rd02 R2 = 940 mm Using the world largest Livermore gold gratings (1480 l/mm) Extremely expensive : 4 gratings (1.1M ), long delivery (18months), need 2 expensive collimators (up and down)

16 Compression performances required for ELI High Field «20PW» beamlines If increasing the fluence on gratings from 0.2 to 1J/cm² in out Save room, and money (save 1,5 to 2M for one compressor + beam collimators)

17 Bottleneck 6: APOLLON 10P Compression gratings New approach (1) 1rst idea under investigation : Metallic /dielectric grating on High index material (Mixed) developed by O. Parriaux (Lab. H. Curien Saint Etienne) Calculated Measured TE 98% Efficiency > 95% from 700 to 1100 nm at 55 Average Efficiency 94% from 730 to 850nm 10-1 C -1 Pow 1,0 8 0,8 HfO 2 Stop etched layer Metal layer 6 4 Efficacité 0,6 0,4 Ordre -1 Ordre 0 Glass substrate 2 0, Wavelength nm , Longueur d'onde en nm But: Damage threshold measurements non reproducible: Best result about 1J/cm² (on grating) Today : R&D on design optimization and deposition process with Institut Fresnel and Jobin Yvon New tests scheduled for exhaustive investigation

18 Bottleneck 6: ILE APOLLON 10P : Compression New approach with «low index» grating (2) New approach under investigation : MMLD (Metal + Multi Layers Dielectric) grating engraved in in low index material (SiO2) TE >95% SiO2 HfO2 Al2O3 Metal film Glass substrate Phys. Rev B 71, (2005) M.Mero & al ILE- Inst. Fresnel Patented Prototype under construction Funding needed if we want to pursue this important investigation

19 ILE APOLLON 10P : Wave front control Wave front control DM = deformable mirror SF = spatial filter DM W/cm² (10PW/1µm²) DM2 ϕ 180 mm SF G1 G4 ϕ 200 mm ϕ 400mm ϕ 400 mm G2 G3

20 Bottleneck 7: Deformable Mirror development ILE/ELI DM requirements : Useful aperture 200mm Hard dielectric coating for broadband fs pulses bimorph NIGHT N mirror Diameter 150mm Dielectric coating 1,06µm CILAS mirrors (monomorph looks very promising diameter up to 200 mm? dielectric coating?) Force momentum mirror Prototype diameter 200mm Early stage of development! Important R&D effort must be done! No back up solution!

21 Bottleneck 8: Large optics with High Damage Threshold Broadband HR coatings Our requirements: - Broadband reflection coatings (>200nm, nm) - High fs Damage threshold : 1J/cm² for 15fs pulses - Large size optics and mirrors : 250 x 350 mm Need collaborative R&D with industrial companies expert in the field Like PGL, Okamoto, Sagem Reosc, etc Early stage of development! Important R&D effort must be done!

22 TiSapphire technology in the first 3 ELI Sites Very front end 1kHz 200mJ, Dl >300nm Contrast: > mOPA 20mJ, 1kHz OPA stages I -IV 1kHz, 180 mj THz TA 20mJ, 1kHz Middle power TAs 200mJ, 1kHz OPA stage V 1kHz, 700 mj OPA stage VI -VIII 1kHz, 5J High power Atto TA HU Very front end 1kHz 200mJ, Dl >300nm Contrast: > oscillators + PFS preamps 1 khz < 6 fs 1 oscillator TiSa + OPCPA preamps 100Hz OPA I -IV 100Hz, 180 mj KrF 248nm 1Hz, 1J, 250fs DPSSL Pump 100Hz <10 fs 10 TW DPSSL Pump 1kHz Booster amp 1 PFS technology DPSSL pump Booster amp 2 PFS technology DPSSL pump Booster amp 3 PFS technology DPSSL pump Small scale TA 400mJ, 100Hz OPA stage V -VI 100Hz, 1.5 J 1J / 100 Hz 1J / 100 Hz Middle intensity TAs 5J, 10Hz Ti:S I 10Hz, 25J Nd:YAG 10 Hz Power amp (2x) OPCPA 10J beamline DPSSL pump Power amp (2x) OPCPA 50J beamline DPSSL pump BACKUP Power amps Ti:Sapph >50J beamline Flashlamp pump Ti:S II -III <Hz, 400J Nd:Glass 0.1 Hz 10 PW block (2x) TI:Sapph Flashlamp pump 10 PW block (3x) TI:Sapph Flashlamp pump 2-3 J / 100 Hz 10 J / 10Hz 50 J / 10Hz 50 J / 1Hz 100 J / 0.1Hz 300 J / 0.1Hz 3x 10PW High intensity beam combination TA High Intensity PW TA XUV / X-ray generation e-and p+ acceleration Plasma physics WDM High-intensity Test & user facility Nuclear Physics and High Intensity CZ RO

23 industrial companies working with ILE on R&D, overcoming bottlenecks: B1) Yb doped Diode Pumped OPCPA Pump Lasers: MBI (Ge), Amplitude Systemes (Fr), B2) TiSa development: Crystal Systems Inc (USA), RSA Le Rubis (Fr), Shangaï Institute for Crystals (China) B3) High Energy ns pump Lasers for TiSa pumping: Thales (Fr), Quantel (Fr), Excel Technology/Continuum (with LLE) (USA), LLNL (USA) B4) LBO development: Cristal Laser (Fr) B5) Diffractive Optical Elements (DOE) for Homogenizing: SILIOS (Fr) B6) New Gratings development: Jobin Yvon (Fr), Plymouth Grating Labs (PGL USA) B7) Deformable mirrors : CILAS (Fr), Phasics (Fr), Imagine Optics (Fr), SESO (Fr), B8) Dielectric coatings (High LIDT, Broadband): SAGEM (Fr), OKAMOTO (Japan + PGL (USA),

24 APOLLON ILE and ELI Infrastructures Required performances (1)

25 APOLLON ILE and ELI Infrastructures Required performances (2)

26 VC-D and VC-E are the criteria normally Considered for electronic microscopes, and Sensitive optical systems 1/3 octave vibration spectrum in different places (outside -red, tunnel -green, HE3 room -blue) when a bus ispassing outside, on the main road.

27 Conclusion -Technological bottlenecks for 10PW TiSa based are already addressed allowing the construction of a prototype( 5-7 PW) before the end of 2013! - Huge R&D effort remains to be launched as soon as possible if we wish to make possible the construction of reliable 10PW TiSa units before 2015