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Proceedings Paper

Higher-order Bessel like beams with z-dependent cone angles
Author(s): Y. Ismail; G. Barnes; T. Mhlanga; V. Belyi; A. Forbes
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Paper Abstract

As in the case of zero-order Bessel beam being produced by illuminating an axicon with a Gaussian beam, higher-order Bessel beams are generated by substituting the Gaussian beam with a Laguerre Gaussian (LG) beam. These beams hold similar properties to zero-order Bessel beams except they carry orbital angular momentum (OAM). They also undergo an abrupt spatial transformation at the boundary of their non-diffracting regime whereby the near-field intensity distribution is a Bessel function which transforms into an annular ring (far-field profile). This can be considered a disadvantage to such beams in comparison to a Gaussian beam that is propagation invariant. By using a double axicon lens system this Bessel beams with z-dependent cone angles can be produced however at the expense of its non-diffracting nature. Here we outline an optical design to produce higher-order Bessel-like beams with z-dependent cone angles that will retains its spatial distribution as z→∞.

Paper Details

Date Published: 16 August 2010
PDF: 6 pages
Proc. SPIE 7789, Laser Beam Shaping XI, 77890C (16 August 2010); doi: 10.1117/12.863345
Show Author Affiliations
Y. Ismail, Council for Scientific and Industrial Research (South Africa)
Univ. of KwaZulu-Natal (South Africa)
G. Barnes, Univ. of KwaZulu-Natal (South Africa)
T. Mhlanga, Univ. of KwaZulu-Natal (South Africa)
V. Belyi, B.I. Stepanov Institute of Physics (Belarus)
A. Forbes, Council for Scientific and Industrial Research (South Africa)
Univ. of KwaZulu-Natal (South Africa)

Published in SPIE Proceedings Vol. 7789:
Laser Beam Shaping XI
Andrew Forbes; Todd E. Lizotte, Editor(s)

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