Digital analysis of a speckle pattern of chaotic mode composition and restoration of a regular intensity pattern after a multimode fiber
| Autor: | Ya. Akimova, Yu. A. Egorov, M. Bretsko, Alexander V. Volyar |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
Materials science
Information theory Chaotic Physics::Optics Digital analysis 02 engineering and technology 01 natural sciences 010309 optics Speckle pattern shannon entropy Optics 0103 physical sciences vortex beams sorting Electrical and Electronic Engineering Q350-390 Multi-mode optical fiber business.industry Mode (statistics) QC350-467 Composition (combinatorics) Optics. Light 021001 nanoscience & nanotechnology Atomic and Molecular Physics and Optics Computer Science Applications Intensity (physics) information optics 0210 nano-technology business |
| Zdroj: | Компьютерная оптика, Vol 45, Iss 2, Pp 179-189 (2021) |
| ISSN: | 2412-6179 0134-2452 |
| Popis: | A process of mode matching in a chaotic speckle pattern without a reference beam responsible for the formation of a holographic grating was studied experimentally and theoretically. Our approach was based on measuring the amplitudes and phases of the Hermite-Gauss (HG) and Laguerre-Gauss (LG) modes in a speckle pattern formed by the radiation of a multimode gradient fiber. The speckle pattern was formed in a hologram of a spatial light modulator using a multimode gradient fiber model while taking into account the mode and polarization dispersion, as well as random phase jumps of each eigenmode. We managed to match 210 modes of the speckle pattern and restore not only the original pattern, but also each structured LG mode and the entire chain of HG eigenmodes. |
| Databáze: | OpenAIRE |
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