研究目的
The main objective of our study was the experimental comparison of the scintillation performance among beams with different correlation functions.
研究成果
The results show generally increased absolute values of scintillation index for NUC beams as compared with GSM and MGSM beams. This effect is hypothesized to be related to the method of NUC beams generation. The study highlights the need for further investigation to explore the propagation of uniformly correlated spatially partially coherent as well as non-uniformly correlated beam classes in more depth.
研究不足
The presented results document only the given experimental scenarios and show the relative comparison between GSM, MGSM and NUC beams with Gaussian used as a turbulence level benchmark. Further investigation is necessary to broaden the scope of our explorations.
1：Experimental Design and Method Selection:
The study involved propagating non-uniformly correlated (NUC), Gaussian Schell (GSM), and Multi-Gaussian Schell (MGSM) model spatially partially coherent laser beams underwater in two scenarios: still water and mechanically agitated water.
2：Sample Selection and Data Sources:
A stabilized 2 mW,
3：8 nm He–Ne laser was used, expanded to fill a 256 × 256 (14 × 14 mm) SLM. List of Experimental Equipment and Materials:
6 Equipment included a spatial light modulator (SLM), lenses, linear polarizers, a mechanical iris, mirrors, a beam splitter, a water tank, and cameras for recording intensity fluctuations.
4：Experimental Procedures and Operational Workflow:
The laser light intensity fluctuations were recorded using two cameras, one positioned on-axis and another perpendicularly to the primary beam path, before and after the underwater link.
5：Data Analysis Methods:
The scintillation index of light over the sensor area was analyzed, with background noise eliminated from all analyzed images.
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He–Ne laser
Used as the light source for the experiments.
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Spatial Light Modulator
256 × 256 (6.14 × 6.14 mm)
Used to generate non-uniformly correlated (NUC), Gaussian Schell (GSM), and Multi-Gaussian Schell (MGSM) model spatially partially coherent laser beams.
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Linear polarizer
Used to align the linear polarization state of the laser with the SLM’s control state.
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Mechanical iris
Used to isolate the desired first diffraction order and block the rest.
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Mirror
Used to direct the laser beam.
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Beam splitter
90:10
Used to split the laser beam.
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Water tank
76 cm long by 30 cm wide, 30 cm in height
Used to simulate underwater conditions for the experiments.
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Mechanical agitator
Used to move the water in the tank to simulate mechanically agitated water conditions.
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Camera
480 × 640 pixels (7.4 μm pitch)
Used to record laser light intensity fluctuations.
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