7-11 July 2014
Africa/Johannesburg timezone
<a href="http://events.saip.org.za/internalPage.py?pageId=16&confId=34"><font color=#0000ff>SAIP2014 Proceedings published on 17 April 2015</font></a>

Control of CO2 vibrational dynamics via shaped-pulse Coherent Anti-Stokes Raman Spectroscopy

8 Jul 2014, 11:50
20m
D Les 102

D Les 102

Oral Presentation Track C - Photonics Photonics

Speaker

Mr Attie Hendriks (CSIR)

Apply to be<br> considered for a student <br> &nbsp; award (Yes / No)?

Yes

Level for award<br>&nbsp;(Hons, MSc, <br> &nbsp; PhD)?

PhD

Would you like to <br> submit a short paper <br> for the Conference <br> Proceedings (Yes / No)?

Yes

Main supervisor (name and email)<br>and his / her institution

Hermann Uys
HUys@csir.co.za

Abstract content <br> &nbsp; (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.

Primary author

Co-authors

Dr Anton du Plessis (Stellenbosch University) Dr Christine Steenkamp (University of Stellenbosch) Dr Hermann Uys (CSIR)

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