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Petawatt Field Synthesizer Towards Joule-scale few-cycle pulses – progress and challenges of short-pulse pumped OPCPA Laboratory for Attosecond and High-Field.

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Presentation on theme: "Petawatt Field Synthesizer Towards Joule-scale few-cycle pulses – progress and challenges of short-pulse pumped OPCPA Laboratory for Attosecond and High-Field."— Presentation transcript:

1 Petawatt Field Synthesizer Towards Joule-scale few-cycle pulses – progress and challenges of short-pulse pumped OPCPA Laboratory for Attosecond and High-Field Physics Max-Planck-Institut für Quantenoptik Garching, Germany & Ludwig-Maximilians-Universität München, Garching Workshop on Petawatt-Lasers at Hard X-Ray Light Sources, Dresden-Rossendorf 7 th September 2011 Zsuzsanna Major

2 Motivation Laser-driven compact secondary sources ATLAS laser laser focussing gas-cell target electron acceleration electron spectrometer transmitted laser beam diagnostics Laser-wakefield acceleration of electrons

3 Stable ~ 230 MeV electron bunches simple setup improved energy stability and repeatability electrons are accelerated on every single shot electron energies always very similar these electron bunches can be used for further applications for the first time Acceleration results - With discharge Without discharge Energies~ 300 MeV~ 150 MeV Energy fluctuations30 %2.5 % Energy spread> 5 % Charge in peak< 10 pC10 ~ 20 pC Charge fluctuations75 %16 % Divergence1.3 mrad RMS0.9 mrad RMS Pointing stability8 mrad RMS1.4 mrad RMS Injection~ 90 %100% J. Osterhoff et al., PRL 101, (2008)

4 200 MeV, 5 pC undulator: 30 cm, 5 mm period spectrum in 70% of all laser shots M. Fuchs et al., Nature Phys. 5, 826 (2009) hints for normalized emittance of ~ 0.8 mm.mrad Spontaneous undulator radiation

5 Undulator radiation: outlook Near-term applications of spontaneous undulator radiation: x-ray pump-probe experiments 5 keV, 5 fs possible with 0.1 PW lasers Few-cycle driver source: Applications: 5-keV table-top XFEL:  scientific case: e.g. single molecule imaging femto-chemistry  needs 1-2 PW-class lasers, 20 fs ok 25-keV XFEL  needs ~10-20 PW lasers  medical imaging ~ 5 fs short electron bunch duration: fraction of the plasma wavelength no nonlinear laser pulse evolution before electron injection can occur

6 High-harmonic generation from solid surfaces Aim: attosecond pulse generation with high intensity Are all harmonics in phase: Attosecond pulse train? With few-cycle pulses: single attosecond pulse? G.D. Tsakiris et al., New Journal of Physics (2006)

7 Phase-stabilized few-cycle driver: single attosecond pulses Few-cycle driver source: 3J, 5 fs sin-pulse cos-pulse G.D. Tsakiris et al., New Journal of Physics (2006)

8 Max-Planck-Institut für Quantenoptik Ludwig-Maximilians Universität München 5 fs 3 J 10 Hz High bandwidth (OPCPA) Large crystals High – rep. pump Yb:YAG CPA pump laser Large aperture DKDP OPCPA bulk/chirped mirror compression Diode pumping Thin KDP or DKDP CPA High pump intensity ps pulse duration The Petawatt Field Synthesizer (PFS) at MPQ

9 Basic concept and layout

10 Frontend Ti:Sa oscillator Ti:Sa 10-pass (modified Femtopower CompactPro): up to 2 mJ, 60 nm, 1 kHz prism compressor: ~23 fs 20 μJ in the range of 700 – 1400 nm

11 Basic concept and layout

12 CPA pump laser chain 2-stage fiber amplifiers pre-amplify to 1 70 MHz dazzler allows for phase correction and amplitude shaping regenerative amplifier in 180 µJ (±1.8 µJ std.) 8-pass booster amplifier gives 300 mJ (±10 mJ std.) after compression Hz, 66% efficiency 80 mJ in frequency-doubled beam 3.5 nm bandwidth by spectral shaping ~ 900 fs FWHM pulse duration after compression S. Klingebiel et al., Opt. Exp. 19, 5357 (2011)

13 CPA pump laser chain Next stage under development: H3 >1 J achieved in simple H3 prototype : Imaging multipass

14 - total path difference ~ 400 m - max. jitter: ~ 100 fs = 30mm - stabilization to needed Timing jitter between pump and seed

15 Pump laser OPCPA seed BBO jitter analysis delay stage Active stabilization superposition of slow (< 1 Hz), large amplitude drift and fast small amplitude fluctuations slow drift can be eliminated by active stabilization origin of the large fluctuations: air turbulences, pointing fluctuations especially in strecher-compressor setup

16 Timing jitter between pump and seed pointing fluctuation at compressor (stretcher) input: S. Klingebiel et al., in preparation

17 17 pointing fluctuation inside compressor (stretcher) due to air turbulence: stretcher and compressor in vacuum S. Klingebiel et al., in preparation Timing jitter between pump and seed

18 Basic concept and layout

19 OPA Experiments 1st stage LBO 4 mm E pump = 7 mJ Ø pump = 3 mm (FWHM) E seed = 20 µJ 2nd stage LBO 2 mm E pump = 50 mJ Ø pump = 5 mm (FWHM) FFT of amplified spectrum: Amplification in 2 OPA stages Amplification dynamics has to be checked in detail in experiment and compared to design calculations

20 OPA experiments Comparison with “pseudo”-3D simulation in DKDP Saturation measurements I. Ahmad, C. Skrobol et al., in preparation Excellent agreement between experiment and calculation, promising for scalability! Small signal gain measurements

21 OPA design Total pump energy: nm Comparison between different models I. Ahmad, C. Skrobol et al., in preparation ”pseudo”-3D model including saturation, dispersion, walk-off, using experimental seed spectrum 8 stages of DKDP 2.4 J output energy transform limited pulse duration: 5.6fs 2 stages of LBO + 3 stages of DKDP 3.7 J output energy transform limited pulse duration: 5.3fs

22 Summary On the route towards Joule-scale few-cycle pulse generation by short-pulse pumped OPCPA we have demonstrated the feasibility of the main building blocks: → generation of synchronized seed pulses → active stabilization of seed and pump pulse to ~ 100 fs → broadband amplification in DKDP and LBO → agreement between experiment and calculation Next stage of pumplaser under development: 4 × 1 J Next steps for OPA: → compression with material and chirped mirrors → verify inherently good contrast → demonstrate scalability

23 Thank you! PFS-team (MPQ) S. A. Trushin, I. Ahmad, C. Wandt, S. Klingebiel, C. Skrobol, M. Siebold*, J. A. Fülöp**, Zs. Major, F. Krausz, and S. Karsch * HZDR, Germany; ** University of Pécs, Hungary MPQ + LMU V. Pervak, A. Apolonski Universidad de Salamanca, Spain R. Borrego Varillas University of Szeged, Hungary M. Mero ICFO Barcelona, Spain A. Thai, P. K. Bates, J. Biegert Forsvarets Forskningsinstitutt, Kjeller, Norway G. Arisholm Friedrich-Schiller Universität, Jena, Germany J. Hein


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