【摘要】：根據非Kolmogorov湍流譜和二階矩理論得到非Kolmogorov湍流中光束漂移模型的一般表達式,結果表明光束漂移與湍流參數(shù)(廣義指數(shù)參數(shù)α、折射率結構參數(shù)C_n~2、湍流外尺度L_0和湍流內尺度l_0)以及輸入平面上的初始二階矩有關。以部分相干反常橢圓空心高斯光束(PCAEHGB)為例,對光束漂移的均方根值B_w和相對光束漂移Br進行數(shù)值模擬。結果表明,廣義指數(shù)參數(shù)、折射率結構參數(shù)、湍流內尺度、湍流外尺度、相干長度和束腰半徑越大,Bw和Br越大。當C_n~2=10~(-14) m~(3-α)、傳輸總路徑L=10km時,B_w≈0.22m;當L≈5km時,B_r達到最大。在相同參數(shù)條件下,PCAEHGB受湍流的影響比高斯-謝爾模型光束小。
[Abstract]:Based on the non-Kolmogorov turbulence spectrum and the second-order moment theory, the general expression of beam drift model in non-Kolmogorov turbulence is obtained. The results show that the beam drift and turbulence parameters (generalized exponential parameter 偽, refractive index structure parameter C = 2), The external scale of turbulence is related to the inner scale of turbulence and the initial second moment on the input plane. Taking the partially coherent anomalous elliptic hollow Gao Si beam (PCAEHGB) as an example, the root mean square (RMS) and relative beam drift (Br) of the beam drift are numerically simulated. The results show that the larger the coherence length and the larger the beam waist radius, the larger the Bw and Br are, the larger the generalized exponential parameter, the refractive index structure parameter, the internal scale, the outer scale, the larger the coherence length and the waist radius. When C = 2 ~ (- 14) m ~ (- 14) m ~ (3-偽) and the total transmission path L=10km, B _ w = 0.22 m, when L 鈮，

本文編號：2438307