8-12 July 2013
Africa/Johannesburg timezone
<a href="http://events.saip.org.za/internalPage.py?pageId=13&confId=32"><font color=#ff0000>SAIP2013 PROCEEDINGS AVAILABLE</font></a>

A coaxial superposition of coherent Gaussian beams

9 Jul 2013, 10:50
20m
Oral Presentation Track C - Photonics Photonics

Speaker

Mr Darryl Naidoo (Council for Scientific and Industrial Research)

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)?

No

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

Andrew Forbes, aforbes1@csir.co.za
CSIR, University of Stellenbosch

Abstract content <br> &nbsp; (Max 300 words)

We explore an interferometric beam shaping technique that considers the coaxial superposition of two Gaussian beams. This technique is traditionally implemented in a Mach-Zehnder interferometer; however, to avoid phase shift drift due to vibrations and thermal effects we employ amplitude and phase modulation with an SLM to achieve the beam shaping. We consider two Gaussian beams of equal but opposite curvature that possess the same phase and width incident on a focusing lens. At the plane of the lens we obtain a multi-ringed beam with a central intensity maximum which develops into a multi-ringed beam with a central null at the focal plane of the lens. The interesting feature of this beam is that is possesses two focal spots on either side of the plane of the focal position of the lens. We investigate the possibility of longitudinal optical trapping at the two focal spots with an obstruction positioned at the focal plane of the lens.

Primary author

Mr Darryl Naidoo (Council for Scientific and Industrial Research)

Co-authors

Prof. Andrew Forbes (Council for Scientific and Industrial Research) Prof. Kamel Ait-Ameur (Centre de Recherche sur les Ions, les Matériaux et la Photonique) Dr Michael Fromager (Centre de Recherche sur les Ions, les Matériaux et la Photonique) Dr Thomas Godin (Institut FEMTO-ST)

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