Abstract
We propose a simple method for the detection of Bessel beams with arbitrary radial and azimuthal indices, and then demonstrate it in an all-digital setup with a spatial light modulator. We confirm that the fidelity of the detection method is very high, with modal cross-talk below 5%, even for high orbital angular momentum carrying fields with long propagation ranges. To illustrate the versatility of the approach we use it to observe the modal spectrum changes during the self-reconstruction process of Bessel beams after encountering an obstruction, as well as to characterize modal distortions of Bessel beams propagating through atmospheric turbulence.
Highlights
Since their discovery in 1987 by Durnin [1,2], Bessel beams have been extensively studied due to their nominally non-diffracting behaviour and their ability to self-reconstruct after encountering an obstruction [3,4,5]
We propose a simple method for the detection of Bessel beams with arbitrary radial and azimuthal indices, and demonstrate it in an all-digital setup with a spatial light modulator
We confirm that the fidelity of the detection method is very high, with modal cross-talk below 5%, even for high orbital angular momentum carrying fields with long propagation ranges
Summary
Since their discovery in 1987 by Durnin [1,2], Bessel beams have been extensively studied due to their nominally non-diffracting behaviour and their ability to self-reconstruct after encountering an obstruction [3,4,5] These beams are characterized by a radial wave vector (kr) and azimuthal index (l), which results from their helical wave front structure. An ideal Bessel beam requires an infinite amount of energy; this beam is practically approximated in a finite region by Bessel Gaussian (BG) Beams [9] Such beams have been generated using annular ring-slits in the far field [2,10], axicons in the near field [11,12], as well as the digital equivalent of both [13,14,15,16]. Such fields are interesting for communication purposes since they carry OAM over extended distances in a nominally non-diffracting manner, and may be advantageous for signal delivery to distance receivers
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