9-13 July 2012
Africa/Johannesburg timezone
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Modal Analysis through Complex Amplitude and Phase modulation

Presented by Mr. Darryl NAIDOO on 12 Jul 2012 from 17:00 to 17:20
Type: Oral Presentation
Session: Photonics
Track: Track C - Photonics

Abstract

We explore an alternative to the Correlation Filter Method (CFM) for the real-time analysis of laser modes using a phase-only spatial light modulator (SLM) operating in reflection mode. This procedure involves encoding a set of orthonormal basis functions into digital holograms by complex amplitude modulation into which the initial field is decomposed. The advantage of such an approach over the CFM is that prior knowledge of the field is not required and this technique allows any function to be encoded with real-time switching of the digital holograms on the SLM. We implement a modal decomposition on a set of modes propagating in a multimode optical fibre supporting 6 LP modes at λ = 1.064 μm (Core diameter = 25 μm, NA = 0.064, V = 4.92). We show that we can successfully decompose the field in amplitude and phase and reconstruct this observed field with very high fidelity.

Award

Yes

Level

PhD

Supervisor

Prof Andrew Forbes AForbes1@csir.co.za CSIR - National Laser Center; University of Stellenbosch; UKZN

Paper

No

Place

Location: IT 4-5


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