Abstract
A convex spiral phaser array (CSPA) is designed and fabricated to generate typical convergent Laguerre-Gaussian (LG) beams. A type of 3D printing technology based on the two-photon absorption effect is used to make the CSPAs with different featured sizes, which present a structural integrity and fabricating accuracy of ~200 nm according to the surface topography measurements. The light field vortex characteristics of the CSPAs are evaluated through illuminating them by lasers with different central wavelength such as 450 nm, 530 nm and 650 nm. It should be noted that the arrayed light fields out from the CSPA are all changed from a clockwise vortex orientation to a circular distribution at the focal plane and then a counterclockwise vortex orientation. The circular light field is distributed 380–400 μm away from the CSPA, which is close to the 370 μm of the focal plane design. The convergent LG beams can be effectively shaped by the CASPs produced.
Highlights
As known, vortex light beams demonstrate some potential applications such as quantum communication [1–5], trapping and manipulation of particles [6–9] and biomedicine [10–12], due to their unique orbital angular momentum [13–17]
The light intensity distribution corresponding to different has following characters in common: (1) the convergent LG beams being successfully generated and converged at a distance of about [380–400] μm, μm, which is already close to the focal plane expected at ~370
A convex lenslens can can be used to present thethe effect of of generation convergent. This poorly integrated system will limit its application in generation convergent LG beams
Summary
Vortex light beams demonstrate some potential applications such as quantum communication [1–5], trapping and manipulation of particles [6–9] and biomedicine [10–12], due to their unique orbital angular momentum [13–17]. Any vortex beam can be considered as a linear combination of LG beams. The light intensity distribution corresponding to different has following characters in common: (1) the convergent LG beams being successfully generated and converged at a distance of about [380–400] μm, μm, which is already close to the focal plane expected at ~370. The light intensity distribution exhibiting a clockwise vortex orientation before the μm; focal plane of CSPA. Thedifference differenceisisthat thatthe thenumber numberofofthe the spiral lobes corresponding spiral lobes corresponding to to different wavelength is variable same topological charge (TC). Corresponding different wavelength is variable butbut thethe same as as thethe topological charge corresponding to to light wavelength. LG beams achieved achieved by us means a possibility for itslong-distance efficient long-distance propagation.
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