High-efficiency generation of Bessel-Gaussian vortex beams using Bessel-phase-embedded fork-shaped holograms

Area of Science:

• Optics and Photonics
• Beam Generation and Manipulation

Background:

• Bessel-Gaussian vortex (BGV) beams are crucial for applications requiring non-diffracting and vortex properties.
• Conventional methods for generating BGV beams, such as using spiral phase plates (SPPs) and axicons, can be complex and less efficient.

Purpose of the Study:

• To present a high-efficiency protocol for constructing pure amplitude and phase Bessel-phase-embedded fork-shaped holograms.
• To generate Bessel-Gaussian vortex (BGV) beams with high fidelity and efficiency.

Main Methods:

• Development of novel Bessel-phase-embedded fork-shaped holograms.
• Illumination of holograms with a Gaussian beam to produce BGV beams.
• Introduction of a quality factor to quantify the similarity between generated and ideal BGV beams.
• Comparison of diffraction efficiency for pure amplitude and phase holograms.

Main Results:

• The proposed holograms generate BGV beams with significantly higher similarity compared to conventional SPP and axicon methods.
• Pure amplitude holograms demonstrate high diffraction efficiency.
• Phase holograms were implemented using a spatial light modulator (SLM).

Conclusions:

• The developed holograms provide a superior method for generating BGV beams.
• Pure amplitude holograms offer an efficient, cost-effective, and straightforward alternative for BGV beam generation.