Higher-order Bessel like beams with z-dependent cone angles

Y. Ismail; G. Barnes; T. Mhlanga; V. Belyi; A. Forbes

doi:10.1117/12.863345

16 August 2010 Higher-order Bessel like beams with z-dependent cone angles

Y. Ismail, G. Barnes, T. Mhlanga, V. Belyi, A. Forbes

Proceedings Volume 7789, Laser Beam Shaping XI; 77890C (2010) https://doi.org/10.1117/12.863345
Event: SPIE Optical Engineering + Applications, 2010, San Diego, California, United States

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→∞.

Citation Download Citation

Y. Ismail, G. Barnes, T. Mhlanga, V. Belyi, and A. Forbes "Higher-order Bessel like beams with z-dependent cone angles", Proc. SPIE 7789, Laser Beam Shaping XI, 77890C (16 August 2010); https://doi.org/10.1117/12.863345

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