Abstract content <br> (Max 300 words)
We demonstrate the intra-cavity generation of a coherent superposition of Laguerre-Gaussian modes of zero radial order but opposite azimuthal order. The superposition is achieved through a set of amplitude rings in a diode-pumped solid-state resonator. By adjusting the number of rings and their thicknesses we can produce modes up to azimuthal order 12. To infer the purity of these modes we perform a full azimuthal modal decomposition by an inner product executed on a phase-only spatial light modulator. We also investigate if there is a phase difference between the Laguerre-Gaussian modes to identify if the phase difference is spatially or temporally dependent. A hallmark of a phase difference is the rotation of the field as the beam propagates into the far field or a rotation of the field at a fixed position over time.
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Andrew Forbes, firstname.lastname@example.org
CSIR, University of Stellenbosch