8-12 July 2013
Africa/Johannesburg timezone
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A coaxial superposition of coherent Gaussian beams

Presented by Mr. Darryl NAIDOO on 9 Jul 2013 from 10:50 to 11:10
Type: Oral Presentation
Session: Photonics
Track: Track C - Photonics

Abstract

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.

Award

Yes

Level

PhD

Supervisor

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

Paper

No

Place

Location: A1-11


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