研究目的
Understanding and mitigating the interaction between laser light and random media, such as atmospheric turbulence, is a fundamental challenge in optical communications. This study focuses on exploring the radial intensity fluctuations, or scintillations, of a beam carrying OAM in comparison to a Gaussian beam when propagating in near-maritime atmosphere.
研究成果
The study found a weak reduction in scintillation index for increasing topological charge in laser beams carrying OAM compared to Gaussian beams in a near-maritime environment. However, the statistical significance of this trend was inconclusive due to the variability in atmospheric conditions. Future research should include more extensive testing to confirm these findings and explore higher topological charges.
研究不足
The study faced challenges due to the variation in atmospheric turbulence during testing, which complicated the analysis. The statistical significance of the findings was limited by the standard deviation of the scintillation index measurements. Additional testing is needed to confirm the observed weak trend in scintillation index reduction for higher topological charges.
1：Experimental Design and Method Selection:
The study involved propagating laser beams carrying OAM in a near-maritime environment over an 890 meter link. The OAM beams were generated using green light (532 nm) and etched spiral phase plates with different topological charges. A co-aligned scintillometer was used to measure atmospheric turbulence.
2：Sample Selection and Data Sources:
The experiment was conducted across the Severn River at the United States Naval Academy, capturing over 14.8 million data points over 28 experimental runs.
3：8 million data points over 28 experimental runs.
List of Experimental Equipment and Materials:
3. List of Experimental Equipment and Materials: A 532 nm laser diode, etched spiral phase plates, a photodetector, and a Scintec ? BLS450 Large Aperture scintillometer were used.
4：Experimental Procedures and Operational Workflow:
The laser beams were propagated over an 890 m link, and the light intensity fluctuations were measured. Data was recorded for approximately 1 min per trial with a sampling rate of 10 kHz.
5：Data Analysis Methods:
The scintillation index was calculated to compare the intensity fluctuations of Gaussian and OAM beams. The refractive index structure constant was measured to quantify turbulence strength.
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