Underwater propagation of spatially partially coherent beams carrying orbital angular momentum

Fjordia Akhtar; Svetlana Avramov-Zamurovic; Charles Nelson; Nate A. Ferlic; K. Peter Judd

doi:10.1117/12.2663794

12 June 2023 Underwater propagation of spatially partially coherent beams carrying orbital angular momentum

Fjordia Akhtar, Svetlana Avramov-Zamurovic, Charles Nelson, Nate A. Ferlic, K. Peter Judd

Proceedings Volume 12543, Ocean Sensing and Monitoring XV; 1254304 (2023) https://doi.org/10.1117/12.2663794
Event: SPIE Defense + Commercial Sensing, 2023, Orlando, Florida, United States

Abstract

We consider the design and generation of spatially partially coherent (SPC) beams carrying orbital angular momentum (OAM) propagating through complex random media. It has been theoretically shown that spatial coherence can be controlled through a prescribed linear superposition of Laguerre-Gaussian (LG) modes. Experimentally the SPC beams are obtained by randomly cycling the phase screens of the coherent modes, with each mode contributing a weight that is proportional to its eigenvalue in the coherent mode decomposition equation. The spectral degree of coherence, ξ , theoretically varies from 0 (fully coherent) to 1 (incoherent). Experimentally, it is suggested that we can reach the highest level of incoherence when the modes are combined where LG mode orders are of equal weights. Preliminary measurements indicate a reduced coherence corresponding to increasing ξ. Our experimental design imposes turbulence on the beam to examine the effects of its spatial partial coherence on the scintillation index (SI). It has been shown that benefits to communication system performance, specifically underwater, can be achieved through the control of spatial coherence properties of laser light propagation.

Citation Download Citation

Fjordia Akhtar, Svetlana Avramov-Zamurovic, Charles Nelson, Nate A. Ferlic, and K. Peter Judd "Underwater propagation of spatially partially coherent beams carrying orbital angular momentum", Proc. SPIE 12543, Ocean Sensing and Monitoring XV, 1254304 (12 June 2023); https://doi.org/10.1117/12.2663794

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