Techniques to sort Bessel beams

Angela Dudley; Thandeka Mhlanga; André McDonald; Filippus S. Roux; Martin Lavery; Miles Padgett; Andrew Forbes

doi:10.1117/12.2026943

28 September 2013 Techniques to sort Bessel beams

Angela Dudley, Thandeka Mhlanga, André McDonald, Filippus S. Roux, Martin Lavery, Miles Padgett, Andrew Forbes

Proceedings Volume 8843, Laser Beam Shaping XIV; 884306 (2013) https://doi.org/10.1117/12.2026943
Event: SPIE Optical Engineering + Applications, 2013, San Diego, California, United States

Abstract

In this work we will present two techniques for the measurement of superimposed higher-order Bessel beams. In the first technique we will outline a simple approach using only a spatial light modulator and a Fourier transforming lens to decompose the OAM spectrum of an optical field. We test this approach on symmetric and non-symmetric superpositions of non-diffracting higher-order Bessel beams. Our second procedure consists of two refractive optical elements which perform a Cartesian to log-polar coordinate transformation, translating helically phased beams into a transverse phase gradient. By introducing two cylindrical lenses we can focus each of the azimuthal modes associated with each Bessel beam to a different lateral position in the Fourier plane, while separating the radial wave-vectors in the image-plane.

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Angela Dudley, Thandeka Mhlanga, André McDonald, Filippus S. Roux, Martin Lavery, Miles Padgett, and Andrew Forbes "Techniques to sort Bessel beams", Proc. SPIE 8843, Laser Beam Shaping XIV, 884306 (28 September 2013); https://doi.org/10.1117/12.2026943

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KEYWORDS

Bessel beams

Optical components

Cylindrical lenses

Spatial light modulators

Holograms

Fourier transforms

Spherical lenses

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