9-13 July 2012
Azimuthal Decomposition of Optical Modes
Presented by Mrs. Angela DUDLEY on 12 Jul 2012 from 16:20 to 16:40
Type: Oral Presentation
Track: Track C - Photonics
We outline a simple approach, using only digital holograms, to perform an azimuthal decomposition of optical modes carrying orbital angular momentum. The decomposition is executed by obtaining the inner product of the incoming mode with a predetermined match filter, which is programmed as a digital hologram. We demonstrate the success of this technique by decomposing a mode which consists of a superposition of two orbital angular momentum carrying Bessel beams, having an arbitrary phase delay between them. From our measurements we are able to reconstruct the spatial distribution, phase and orbital angular momentum density of the initial mode. The ability to decompose modes (especially those carrying orbital angular momentum) is relevant in both classical and quantum optics, as well as the field of mode multiplexing for optical communication.
Prof Andrew Forbes, AForbes1@csir.co.za, CSIR National Laser Centre