Abstract
Bessel beams are widely used in optical metrology mainly because of their large Rayleigh range (focal length). Radial/azimuthal polarization of such beams is of interest in the fields of material processing, plasma absorption or communication. In this paper an experimental set-up is presented, which generates a Bessel-type vector beam with a spatial polarization, oscillating along the optical axis, when propagating in free space. A first holographic axicon (HA) HA1 produces a normal, linearly polarized Bessel beam, which by a second HA2 is converted into the spatial oscillating polarized beam. The theory is briefly discussed, the set-up and the experimental results are presented in detail.
Highlights
Bessel beams are widely used in optical metrology mainly because of their large Rayleigh range
SLM1 upload the combined hologram in (b) and SLM2 upload the combined hologram in (c). (b,c) show the hologram to generate first order oscillating polarized (OP) vector beams. (b) The hologram on SLM1 to generate Bessel beams, which corresponds to an axicon (HA1) and a first order spiral phase plate (SPP). (c) The hologram on SLM2 to generate the additional phase shift, where HA2 combined with a second order SPP
The unique characteristic of the OP beams is the linear rotation of the polarization distribution along the optical axis
Summary
Bessel beams are widely used in optical metrology mainly because of their large Rayleigh range (focal length). By using axicon holograms realized by spatial light modulators (SLM 1, SLM 2), a new method is presented to generate Bessel-type vector beams with spatial oscillating polarization along the z-axis. Right and left circularly polarized Bessel beams, which have opposite topological charge can be combined and result in a Bessel-type vector beam, as shown in Eq (3)
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