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Simon Hutchinson February 21 st 2012

Simon Hutchinson February 21 st 2012. What did they accomplish?. “full electromagnetic transparency to XUV light in He can be achieved by destructively interfering two distinct multi-photon ionization pathways”. Electromagnetic transparency via q uantum interference.

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Simon Hutchinson February 21 st 2012

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  1. Simon Hutchinson February 21st 2012

  2. What did they accomplish? “full electromagnetic transparency to XUV light in He can be achieved by destructively interfering two distinct multi-photon ionization pathways” Electromagnetic transparency via quantum interference 2. Multi-photon ionization pathway – XUV + IR IR XUV Helium Ip = 24.6 eV 3. Results: Transparency and modulation of ionisation rate at twice the electromagnetic frequency of the IR pulse.

  3. Electromagnetically Induced Transparency |3› Dressing field |2› IMPORTANT FOR LATER Fairies Quantum Opposite phase Same amplitude |1› Creates coherent states and allows for quantum interference

  4. Assisted Ionisation Channels in Helium Continuum 2p -3.63 eV -3.69 eV Dressing Field -6.84 eV 1. Coherence2. Coupling 1. 2. -24.59 eV 1s

  5. Control in the Experiment (Total Ionization Channel Probability Amplitude) 1. XUV amplitude • XUV mirror coatings • Al filter 2. XUV energy tuning • Phase-matching via pressure tuning

  6. Control in the Experiment 3. Phases of interfering channels • Delay between IR dressing field and XUV pulses

  7. The Experiment (part one) (XUV at t0, IR x-axis) Using COLTRIMS, measure He+ yield as the 13th harmonic is scanned. Enhancement for positive delays: transient (resonant?) multi-photon ionisation.

  8. The Experiment (part two) Lifetime of 2p state in helium = 10ps Phys. Rev. A 28, 3340–3348 (1983)

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