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光外差探测效率不仅与大气湍流有关,还与信号光及本振光在探测器光敏面上的分布特性有。对不同光场分布下大气湍流对外差效率的影响进行了分析对比,讨论了湍流影响下外差效率随探测器半径的变化关系。结果表明:当信号光和本振光为Airy+Gauss模型时,大气湍流对外差效率的影响最小,且外差效率达到最大值后不随探测器半径的增大而变化;Airy+平面波模型受湍流的影响最大,即使在弱湍流下外差效率下降也十分迅速,最大可下降95.13%。
The detection efficiency of optical heterodyne is not only related to atmospheric turbulence but also to the distribution characteristics of signal light and local light on the photosensitive surface of the detector. The effects of atmospheric turbulence on the heterodyne efficiency under different light field distribution are analyzed and compared. The relationship between the heterodyne efficiency and the radius of the detector under turbulence is discussed. The results show that the atmospheric turbulence has the least effect on the heterodyne efficiency when the signal light and the local light are the Airy + Gaussian model, and does not change with the radius of the detector when the heterodyne efficiency reaches the maximum value. The Airy + plane wave model is turbulent The influence is the greatest. Even under the weak turbulence, the efficiency of heterodyne decreases rapidly and the maximum can drop by 95.13%.