Abstract
Internal conical refraction leads to the formation of zero (J<sub>0</sub>) and first order (J<sub>1</sub>) Bessel beams in superposition. The (J<sub>0</sub>) beam retains the input circular polarisation and the (J<sub>1</sub>) has opposite polarisation but with a single phase change around the beam axis giving it &barh; optical angular momentum per photon. This results in the conical beam having ½ &barh; net optical angular momentum per photon. This provides a simple system in which a beam of 0, ½ and &barh; optical angular momentum can be easily generated and selected with use of only a circular polariser. In the far field the characteristic Bessel beam structures are formed and can be made non-diverging with use of a lens. We report the formation of non-diverging Bessel beam of core diameter (a) of 5.7μm over a maximum non-diverging core length of 1(±.05)mm. However due to the fine structure of the conical beam at its beam waist position two cores are produces and are of opposite phase.
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