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Kansas State Light Source

Kansas State Light Source. The dream laser for AMO studies. The Optical Prospect of Laser-matter Interaction. High power, or high repetition rate?. High power laser ( 10 15 W ) Ultrahigh intensity: 10 21 W/cm 2 Relativistic plasma physics (hot, but not our expertise) High cost

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Kansas State Light Source

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  1. Kansas State Light Source The dream laser for AMO studies

  2. The Optical Prospect of Laser-matter Interaction

  3. High power, or high repetition rate? • High power laser ( 1015 W ) • Ultrahigh intensity: 1021 W/cm2 • Relativistic plasma physics (hot, but not our expertise) • High cost • Single shot • High repetition rate laser (1012 W) • High intensity: 1015-18 W/cm2 • Nonperturbative atomic physics (also hot, our expertise) • High stability (1% RMS) and high repetition rate • Fast accumulation of weak signal (TOF, COTRIMS) • Fast feedback control (coherent control)

  4. “Nominal” parameters of KSLS I = 2x1015W/cm2 • Focal spot size : 100µm • Pulse duration : 20 fs • Pulse energy : 6 mJ • Repetition rate : 1 KHz

  5. Kansas State Light Source Development Plan • The 1st phase: 11/30/01, 3 mJ, 20fs • The 2nd Phase: 01/31/01, 6 mJ, 20fs • The 3rd Phase: 03/31/02, 3 mJ, 7fs 12/31/00 12/31/01 12/31/02

  6. Kansas State Light Source Pump Laser Faraday Pockels Cell Isolator Oscillator Stretcher Isolator Amplifier Compressor Pump Laser Pump Laser 6 mJ, 20 fs, 1 kHz Beam Expander

  7. Achievable Intensity with KSLS I = 2x1019W/cm2 • Focal spot size : 1µm • Pulse duration : 20 fs • Pulse energy : 6 mJ • Repetition rate : 1 KHz

  8. Experiments using Kansas State Light Source • Ionization • Barrier suppression (above-barrier, Barrier suppression) • Molecules • Non-sequential • High Harmonic Generation • Attosecond pulse • keV x-ray • Phase-matching • Ion+laser-atom interaction

  9. High Harmonic Generation -The experiment done with Ultrafast Photon Source, the brother of Kansas State Light Source

  10. HHG Experimental Set-up

  11. Extending the Cut-off • Using long wavelength pulse lasers

  12. Slit HHG Spectrum Grating 2000 l/mm =2 deg sphere High Harmonic Generation with OPA MCP & Phosphor Ti:S Laser 1.2mJ, 25fs Gas nozzle CCD OPA 1.1 ~ 1.6m 30 ~ 100J 25 fs Filter FL=88.3mm I=3x1014 W/cm2

  13. Tunability of X-ray Wavelength 0.8 m 1.51 m order = 37 1.37 m order = 37 1.22 m order = 37 30 40 50 60 70 80 90 Photon Energy (eV)

  14. 0.8 m 1.51 m 0.2 m B Filter Al Edge Cutoff 0.2 m Al Filter 40 60 80 100 120 140 160 180 200 HHG Photon Energy (eV) Extension of Harmonic Cutoff

  15. Prediction: Ultrafast KeV X-ray Generation Z. Chang PRL, 1997

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