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Multimodal Volumetric Retinal Imaging by Oblique Scanning Laser Ophthalmoscopy (oSLO) and Optical Coherence Tomography (OCT)
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Sidelobe contrast reduction for optical vortex beams using a helical axicon.

V V Kotlyar1, A A Kovalev, V A Soifer

  • 1Image Processing Systems Institute, Russian Academy of Sciences, Samara State Aerospace University, Samara, Russia.

Optics Letters
|March 22, 2007
PubMed
Summary

We developed a new optical vortex generation method using a helical axicon. This technique reduces sidelobes and energy loss without altering vortex radius, validated by liquid crystal display experiments.

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Shaping the Amplitude and Phase of Laser Beams by Using a Phase-only Spatial Light Modulator
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Shaping the Amplitude and Phase of Laser Beams by Using a Phase-only Spatial Light Modulator
08:39

Shaping the Amplitude and Phase of Laser Beams by Using a Phase-only Spatial Light Modulator

Published on: January 28, 2019

Area of Science:

  • Optics and Photonics
  • Laser Physics
  • Vortex Beam Generation

Background:

  • Optical vortices are crucial in applications like optical trapping and information transmission.
  • Conventional methods for generating optical vortices often suffer from sidelobe issues or energy inefficiencies.
  • Minimizing sidelobes and energy loss is essential for practical applications of vortex beams.

Purpose of the Study:

  • To introduce a novel method for generating optical vortex patterns.
  • To achieve reduced sidelobes in optical vortices without increasing their radius.
  • To minimize energy loss during optical vortex generation.

Main Methods:

  • Combining a spiral phase plate with a weak axicon to create a helical axicon.
  • Utilizing a liquid crystal display for experimental implementation.
  • Theoretical analysis and experimental validation of the generated optical vortex pattern.

Main Results:

  • Successfully generated an optical vortex pattern with significantly reduced sidelobes.
  • Demonstrated that the vortex radius remained unchanged.
  • Observed minimal energy loss in the generated optical vortex.
  • Experimental results closely matched theoretical predictions.

Conclusions:

  • The helical axicon approach is an effective method for generating high-quality optical vortices.
  • This technique offers a practical solution for producing optical vortices with improved fidelity.
  • The method shows promise for advanced optical manipulation and communication systems.