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SUMMARY:High order harmonic generation and the control of quantum paths - 
 Amelle Zair (Imperial College\, London)
DTSTART:20121203T153000Z
DTEND:20121203T170000Z
UID:TALK41172@talks.cam.ac.uk
CONTACT:6270
DESCRIPTION:High order harmonic generation (HHG) is a non-linear process r
 esulting from the interaction of an intense and short laser pulse with mat
 ter. This process consists in the up-conversion of the laser fundamental f
 requency to provide a broad frequency comb covering photon energy from UV 
 to XUV\, allowing the production of attosecond pulses in a very robust way
 .\n\nThe process of HHG can be understood as a subsequent of 3 steps where
  an electronic wavepacket is first free in the continuum by tunnel ionisat
 ion\, driven away then back to the parent ion by the laser field and then 
 recombine with the core inducing the emission of harmonics photons. These 
 3 steps can be seen as Feynman paths that can be controlled in order to re
 veal dynamical processes in atoms and molecules. In the last past year I d
 emonstrated a unique technique where conditions can be found to make these
  Feynman paths interfere. This technique is now named 'quantum path interf
 erences'. I will present how I first demonstrate this technique in atoms a
 nd how it is possible to use it to reveal ultra-fast molecular dynamics af
 ter ionisation. It is crucial to found self-referenced technique that allo
 w us to retrieve information on charge migration after ionisation (nuclear
  and/or electronic) as this is these ultra fast dynamics that underpins st
 ructural changes in molecules within activation or inhibition of molecular
  properties.\n\n \n\n \n\n
LOCATION:Rutherford building\, Seminar Room B
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