强湍流区的光束漂移
Beam wander in moderate to strong turbulence
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摘要: 基于修正Rytov理论，导出了适应于强湍流起伏区的光束漂移方差表达式，分析了湍流外尺度、有效散射区域尺度和光束束腰对光束漂移的影响，并与实验结果进行了比较。结果表明，相对于基于指数模型的光束漂移方差表达式，基于修正Rytov理论给出的表达式的计算结果能更好地与实验结果吻合。当光束束腰大于有效散射区域尺度时，不发生饱和效应，导出的表达式与传统理论给出的表达式一致；当光束束腰小于有效散射区域尺度时，光束漂移的幅度不随Rytov方差的增大而明显变化。Abstract: Based on the Rytov approximation which is modified with a filter function, expressions are derived for the variance associated with the beam wander in moderate to strong turbulence regimes. The effects of the diameter of the effective scattering region and beam waist on the beam wander are analyzed, and the derived variance expression is compared with experimental data. The results show that the calculated value from the derived displacement variance extending into all regimes is in better agreement with experimental data, compared with the variance based on the exponential model. When the beam waist is larger than the diameter of the effective scattering region, the effects of the saturation don’t occur. When the diameter of the effective scattering region is larger than the beam waist,
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