Speaker
Mr
Ruan Viljoen
(Stellenbosch University)
Description
Probing the vibrational energy states of molecules can be done by Coherent Anti-Stokes Raman Scattering (CARS) Spectroscopy. Traditionally two or three different laser beams are employed to pump and probe the vibrational spectrum of molecules, probing the molecules one wavelength at a time. With the introduction of a coherent broadband light source it is possible to pump and probe multiple states simultaneously, with a single broadband beam. Increasing the pump bandwidth has the disadvantage of increasing the non-resonant CARS signal which drowns out and masks the spectrum-containing resonant signal. For broadband single beam CARS, the question is: how does one extract the Raman spectrum from the mix of resonant and non-resonant CARS? In this presentation we introduce novel techniques that answer this question. We simulate these techniques to illustrate the expected single beam CARS measurements and how a vibrational Raman spectrum can be extracted. Comparisons are made between these simulations and experiments on liquid and crystalline samples to prove the techniques.
Supervisor details<br><b>If not a student, type N/A.</b><br>Student abstract submision<br>requires supervisor permission:<br>please give their name,<br> institution and email address.
Prof Erich Rohwer, Laser Research Institute, egr@sun.ac.za
| Consideration for<br>student awards<br><b>Choose one option<br>from those below.</b><br>N/A<br>Hons<br>MSc<br>PhD | PhD |
|---|---|
| Please confirm that you<br>have carefully read the<br>abstract submission instructions<br>under the menu item<br>"Call for Abstracts"<br><b>(Yes / No)</b> | Yes |
Primary authors
Mr
Dirk-Mathys Spangenberg
(University of Stellenbosch)
Prof.
Erich Rohwer
(University of Stellenbosch)
Dr
Pieter Neethling
(Laser Research Institute, University of Stellenbosch)
Mr
Ruan Viljoen
(Stellenbosch University)
