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>

Breaking the intra-cavity degeneracy of vortex modes

9 Jul 2014, 11:50
D Les 102

D Les 102

Oral Presentation Track C - Photonics Photonics


Mr Darryl Naidoo (CSIR)

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We investigate an intra-cavity approach for the realisation of arbitrary orbital angular momentum (OAM) mode selection of opposite handedness by implementing a technique of spin angular momentum (SAM) to OAM coupling through a q-plate. It is well known that the spatial intensity distribution of laser modes with opposite handedness (such as +l and -l) in their helicoidal wavefronts are indistinguishable and in the context of a laser cavity they also posses identical intra-cavity losses. The discrimination of either mode thus proves improbable and is accredited to the degeneracy of this set of angular modes. While many studies claim pure OAM mode selection, they suffer from inconclusive confirmation on the state of OAM at the output. In this study we show the controlled intra-cavity selection of pure OAM LG0l modes of opposite handedness and demonstrate it experimentally. With this we also present a direct approach to realise LG0l modes of radial and azimuthal polarisation states, respectively.

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

Prof Andrew Forbes, aforbes1@csir.co.za, CSIR

Primary author

Mr Darryl Naidoo (CSIR)


Prof. Andrew Forbes (CSIR) Dr Angela Dudley (CSIR) Dr Igor Litvin (CSIR)

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