双曲余弦高斯列阵光束通过湍流大气传输的角扩展及方向性
Angular spread and directionality of cosh-Gaussian array beams propagating through atmospheric turbulence
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摘要: 采用积分变换,推导出了双曲余弦高斯(ChG)列阵光束通过湍流大气传输的二阶矩束宽和角扩展的解析公式,给出了ChG列阵光束与一束高斯光束具有相同角扩展的条件。研究表明:相干合成的ChG列阵光束的角扩展比非相干合成的小,但是,非相干合成的ChG列阵光束的角扩展受湍流影响比相干合成ChG光束小;相干合成情况下,ChG列阵光束的角扩展随离心参数、束腰宽度和相对子光束间距的变化均出现振荡,但在湍流中的振荡减弱,非相干合成情况下,ChG列阵光束的角扩展与相对子光束间距和光束数无关。
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关键词:
- 双曲余弦高斯列阵光束 /
- 湍流 /
- 相干和非相干合成 /
- 角扩展 /
- 方向性
Abstract: The closed-form expressions for the mean-squared beam width and the angular spread of cosh-Gaussian (ChG) array beams propagating through atmospheric turbulence are derived by the integral transform technique. The condition in which ChG array beams have the same directionality as single Gaussian beam is given. It is shown that the angular spread of ChG array beams for coherent combination is smaller than that for incoherent combination, while the latter is less sensitive to turbulence. For coherent combination, the angular spread oscillates when the decentered parameter, waist width and relative separation distance of beams vary. And the oscillatory behavior becomes weaker in turbulence. For incoherent combination, the angular spread is independent of the relative separation distance of be
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