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SUMMARY:From Ultrafast Spectroscopy to X-ray imaging and back again - Dr J
 eff Davis Swinburne Univ of Tech Australia
DTSTART:20080617T100000Z
DTEND:20080617T113000Z
UID:TALK12454@talks.cam.ac.uk
CONTACT:6270
DESCRIPTION:Non-linear spectroscopy has been an important tool for reveali
 ng the dynamics in condensed matter systems for decades. Two-dimensional F
 ourier transform spectroscopy (2DFTS) is such a technique that has recentl
 y been extended from nmr to optical spectroscopy and is becoming increasin
 gly important for revealing the dynamics of quantum mechanical coupling be
 tween different electronic states.  In standard 2DFTS a transient four-wav
 e mixing signal is detected by spectral interfereometry\, which allows det
 ermination of both the intensity and phase as a function of emission energ
 y.  However\, this approach requires phase stability between each of the t
 hree pulses generating the FWM signal and a fourth local oscillator pulse\
 , which is challenging\, and prevents the use of two-colour excitation. We
  have developed a technique that is able to retrieve the phase of the emis
 sion from spectrally resolved intensity measurements\, thereby removing th
 e need for interferometry\, simplifying the experimental setup\, and allow
 ing the possibility of two-colour excitation.  \n\nI will be discussing th
 e development of this technique\, including the experimental fundamentals\
 , and the phase retrieval teqhniques that are drawn from other areas of ph
 ysics including coherent diffractive imaging and frequency resolved optica
 l gating (FROG) measurements.  I will also discuss the significance and in
 terpretation of 2DFTS\, and the exciting applications of the technique in 
 the past\, present and future.\n\n \n\n
LOCATION:HEP Seminar Room (980) Rutherford Building\, Cavendish Laboratory
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