Generating a hollow twisted correlated beam using correlated perturbations

Area of Science:

• Optics and Photonics
• Quantum Optics
• Laser Physics

Background:

• Coherence vortices typically possess nonzero topological charge (TC).
• Generating hollow-centered optical beams with controllable properties is challenging.
• Low coherence environments require specialized optical tools for particle manipulation.

Purpose of the Study:

• To synthesize a novel twisted correlated optical beam with a dark hollow center.
• To investigate the generation of beams with zero topological charge (TC) mode.
• To explore applications in optical particle manipulation within low coherence environments.

Main Methods:

• Synthesis via correlated correlation perturbation and incoherent mode superposition.
• Constructing correlations between twist factor and spot structure parameter.
• Theoretical analysis and experimental verification of beam properties.

Main Results:

• A twisted correlated optical beam with a tunable dark hollow center was successfully synthesized.
• The generated beam exhibits a zero topological charge (TC) mode, distinguishing it from coherence vortices.
• Twist correlation results in asymmetric orbital angular momentum spectral distribution and tunable intensity centers.
• Focal spots with a dark core were achieved by controlling correlation parameters, even with zero dominant TC mode.

Conclusions:

• The developed method provides a new route to generate nontrivial optical beams with unique intensity profiles.
• The ability to control the beam's dark core and TC mode is crucial for advanced optical applications.
• These findings offer significant technical preparations for optical particle manipulation in low coherence settings.