Measuring high-order orbital angular momentum based on a microlens array with sectorial subaperture
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Summary
This summary is machine-generated.A novel microlens array with sector sub-aperture (MLA-S) accurately measures orbital angular momentum (OAM) of vortex beams. This device precisely determines OAM magnitude and sign, even for complex multi-ring beams.
Area Of Science
- Optics and Photonics
- Quantum Information Science
Background
- Vortex beams carry orbital angular momentum (OAM), crucial for advanced optical applications.
- Accurate OAM measurement is essential for OAM-based communication and sensing.
Purpose Of The Study
- To propose and experimentally validate a microlens array with sector sub-aperture (MLA-S) for precise OAM measurement.
- To demonstrate the MLA-S's capability in measuring OAM magnitude, sign, and handling multi-ring vortex beams.
Main Methods
- Utilizing a circularly symmetric MLA-S to split the spiral phase of vortex beams.
- Approximating sub-wavefronts as tilted wavefronts for OAM characterization.
- Analyzing far-field spot displacement to determine OAM information.
Main Results
- Achieved precise OAM measurement with a range up to ±112 orders and low absolute errors (~0.1).
- Successfully separated and measured OAM for individual rings in multi-ring perfect vortex beams simultaneously.
- Demonstrated error compensation for off-center beam deviations due to the MLA-S's circular symmetry.
Conclusions
- The MLA-S offers a new, robust technical approach for measuring vortex beam OAM.
- The device shows significant promise for various OAM-based applications, including secure communication and advanced imaging.
- The MLA-S's design facilitates accurate and simultaneous OAM analysis of complex light fields.
View abstract on PubMed
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