Efficient scaling of output pulse energy in static hollow fiber compressors X. Chen, A. Malvache, A. Ricci, A. Jullien, R. Lopez-Martens ICUIL 2010, Watkins.

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Presentation transcript:

Efficient scaling of output pulse energy in static hollow fiber compressors X. Chen, A. Malvache, A. Ricci, A. Jullien, R. Lopez-Martens ICUIL 2010, Watkins Glenn, 29 september UMR 7639

Size of focus ~ 2 “lambda cube” regime Wavefront correction Goal: relativistic intensity at 1kHz Peak intensity ~ W/cm 2 Peak intensity ~ W/cm 2 Deformable Mirror Target Low f parabaloid Tight focusing 1 mJ, 5 fs 1 kHz Albert et al., Optics Letters 2000

Hollow fiber compression principle Spectral broadening via SPM in rare gas Guided propagation High damage threshold, low absorption Compression using chirped mirrors standard: 25fs ~ 1mJ< 10fs < mJ Scaling limited by ionization/self-focusing Nisoli et al., Appl. Phys. Lett. 68, 2793 (1996)

Solutions Pressure gradients (5m, 5fs) Bohman et al., Opt. Lett. 35, 1887 (2010) High pressures, large setups planar waveguides (8mJ, 11fs) Akturk et al., Opt. Lett. 34, 838 (2005) complex setup, non-uniform beam guided ionization (12fs, 14 mJ) Fourcade Dutin et al., Opt. Lett. 35, 253 (2010) Blue-shifting, high losses

Circular polarization n 2 (CP) = 2/3 n 2 (LP) Less self-focusing Better coupling Into fiber Reduced ionization Experimental conditions

Commercial Front-end Femtopower Compact Pro CEP Single pump laser 11 W 1 kHz frequency-doubled Nd-YLF laser DM50 series Photonics Industries Home made 3-pass amplifier 20 W CEP-stable multi-mJ laser Hybrid compressor: Transmission gratings + chirped mirrors 2 mJ, 26 fs, CEP stabilized pulses Canova et al., Opt. Lett. 34, 1333 (2009)

High energy hollow fiber compression Chen et al., Opt. Lett. 34, 1588 (2009)

Circular polarization = higher throughput better coupling up to 30% more transmission better coupling up to 30% more transmission

More stable propagation for CP CP = more stable propagation LP CP Spectral stability

1mJ, sub-5fs, CEP locked pulses Sub-5fs duration Robust CEP lock (~250mrad)

Commercial Front-end Femtopower Compact Pro CEP Single pump laser 11 W 1 kHz frequency-doubled Nd-YLF laser DM50 series Photonics Industries Home made 3-pass amplifier 20 W Laser upgrade Hybrid compressor: New transmission gratings + chirped mirrors 2 mJ, 26 fs, CEP stabilized pulses 3.5 mJ, 26 fs, CEP stabilized pulses

Pulse pre-chirping in Neon 3 mJ input 70 % < 27 %

Controlled spectral broadening

Optimal results 1.6 mJ, sub-5fs (after chirped mirrors) 1.6 mJ, sub-5fs (after chirped mirrors) CEP control

On-target intensity 1.6mJ, 4.8fs target f/1.7 parabola Beam expander Vacuum chamber HHG 1.7 x 1.8  m 2 I max ~ 3 x W/cm 2

Confirmed by solid target HHG results f/6 focusing : 3 x W/cm 2 HHG spectra CEP dependence Harmonic order CEP (deg)

Further scaling options Higher energies: Helium gas

more efficient chirped mirrors Ultrafast Innovations GmbH (Pervak et al., Opt. Exp. 17, 7943 (2009)) Further scaling options 1.9mJ, 4.3 fs (63% !) Raw FROG trace Temporal profile Better compression in UV Need to work on IR

circular polarization Helium gas input pulse pre-chirping larger core fiber (~ 400  m) CEP-stable, 5mJ, 5fs (1 TW) « compact » setup I max W/cm 2 Future with laser upgrade to 10mJ: