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Multilevel Spiral Axicon for High-Order Bessel-Gauss Beams Generation.

Rebeca Tudor1, George Andrei Bulzan1,2, Mihai Kusko1

  • 1National Institute for Research and Development in Microtechnologies IMT, 077190 Bucharest, Romania.

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|February 11, 2023
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Summary
This summary is machine-generated.

Researchers developed a compact optical element, a multilevel spiral axicon, for efficient generation of Bessel-Gauss beams with orbital angular momentum (OAM). This offers a simpler alternative for optical and quantum communications.

Keywords:
OAMdivergence-free beamsfused silica opticspropagation invariancespiral axicon

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Area of Science:

  • Optics and Photonics
  • Diffractive Optics
  • Beam Shaping

Background:

  • Generating Bessel-Gauss beams with orbital angular momentum (OAM) is crucial for advanced optical applications.
  • Existing methods often involve complex setups like spatial light modulators (SLMs) or interferometric techniques.
  • There is a need for simpler, more efficient methods for OAM beam generation.

Purpose of the Study:

  • To present an efficient and compact method for generating high-order Bessel-Gauss beams carrying OAM.
  • To demonstrate the fabrication and characterization of multilevel spiral axicons for this purpose.
  • To offer a viable alternative to complex OAM beam generation techniques.

Main Methods:

  • Fabrication of multilevel spiral axicons with 16 and 32 levels.
  • Characterization of the fabricated diffractive optical elements (DOEs) for visible light (λ = 633 nm).
  • Evaluation of mode conversion efficiency and transmission properties.

Main Results:

  • Successful fabrication of multilevel spiral axicons.
  • High mode conversion efficiency and good transmission achieved for visible light.
  • Demonstration of efficient generation of Bessel vortex states.

Conclusions:

  • Multilevel spiral axicons provide an efficient and compact method for generating Bessel-Gauss beams with OAM.
  • This approach simplifies OAM beam generation compared to existing complex methods.
  • The generated Bessel vortex states are suitable for optical and quantum communication systems.