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Single-path interferometric technique for measuring the orbital angular momentum spectrum of a structured light beam
Optics Letters
|August 15, 2025
Summary
We developed a new single-path interferometric technique for measuring the orbital angular momentum (OAM) spectrum of light. This method enhances measurement efficiency and accuracy for real-time optical applications.
Area of Science:
- Optics and Photonics
- Quantum Information Science
Background:
- Accurate measurement of orbital angular momentum (OAM) spectrum is crucial for advanced optical systems.
- Existing methods for OAM spectrum analysis can be inefficient and lack real-time capability.
Purpose of the Study:
- To propose and demonstrate a novel single-path interferometric technique for OAM spectrum measurement.
- To enhance the efficiency and accuracy of OAM mode decomposition and full-field reconstruction.
Main Methods:
- Development of a single-path interferometric setup.
- Experimental demonstration of full-field reconstruction and OAM mode decomposition.
- Single-shot intensity measurement for OAM spectrum retrieval (under specific conditions).
Main Results:
- The proposed technique significantly improves measurement efficiency and accuracy compared to standard methods.
- Successful full-field reconstruction and OAM mode decomposition were achieved.
- OAM spectrum retrieval from a single-shot measurement is possible for beams without opposing OAM modes.
Conclusions:
- The single-path interferometric technique offers a new approach for fast and accurate OAM spectrum diagnosis.
- This method has significant potential for real-time and broadband applications, including high-dimensional optical communications.
