Generation of continuously tunable fractional optical orbital angular momentum using internal conical diffraction
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2010Citation:
O'Dwyer, DP, Phelan, CF, Rakovich, YP, Eastham, PR, Lunney, JG, Donegan, JF, Generation of continuously tunable fractional optical orbital angular momentum using internal conical diffraction, Optics Express, 18, 16, 2010, 16480-16485Download Item:
Abstract:
When a left-circularly polarised Gaussian light beam, which has
spin angular momentum (SAM)
J
sp
=
?
?
= 1
?
per photon, is incident along
one of the optic axes of a slab of biaxial crystal it undergoes internal conical
diffraction and propagates as a hollow cone of light in the crystal. The
emergent beam is a superposition of equal amplitude zero and first order
Bessel like beams. The zero order beam is left-circularly polarised with zero
orbital angular momentum (OAM)
J
orb
=
?
?
= 0, while the first order beam
is right-circularly polarized but carries OAM of
J
orb
= 1
?
per photon. Thus,
taken together the two beams have zero SAM and
J
orb
= ?
?
per photon. In
this paper we examine internal conical diffraction of an elliptically polarised
beam, which has fractional SAM, and demonstrate an all-optical process for
the generation light beams with fractional OAM up to ? 1
?
Author's Homepage:
http://people.tcd.ie/jdoneganhttp://people.tcd.ie/phelanci
http://people.tcd.ie/rakovicy
http://people.tcd.ie/jlunney
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Optics Express18
16
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Gaussian light beamDOI:
http://dx.doi.org/10.1364/OE.18.016480Metadata
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