Speaker
Apply to be<br> considered for a student <br> award (Yes / No)?
Yes
Would you like to <br> submit a short paper <br> for the Conference <br> Proceedings (Yes / No)?
Yes
Level for award<br> (Hons, MSc, <br> PhD)?
PhD
Main supervisor (name and email)<br>and his / her institution
Hermann Uys
HUys@csir.co.za
Abstract content <br> (Max 300 words)<br><a href="http://events.saip.org.za/getFile.py/access?resId=0&materialId=0&confId=34" target="_blank">Formatting &<br>Special chars</a>
We investigate control of the vibrational dynamics of CO2 molecules in gas phase using Coherent Anti-stokes Raman Scattering (CARS). During CARS, a pump and Stokes pulse excite a vibrational mode via a Raman process. This is followed by a probe pulse which indicates the extent of mode occupation through Anti-Stokes fluorescence. In our experiment we simultaneously excite the bend and stretch modes of CO2, and observe coherent temporal oscillations in the Anti-Stokes signal, at the beat-note of the two modes. Using a learning algorithm we execute time-frequency shaping of the pump pulses in our CARS experiment. This provides selective excitation between the stretch and bend modes. We compare the experimental outcomes to a perturbative model that simulates the nonlinear dynamics.
