部分相干反常椭圆空心高斯光束在非Kolmogorov湍流中的光束漂移
发布时间：2019-03-11 13:10
【摘要】：根据非Kolmogorov湍流谱和二阶矩理论得到非Kolmogorov湍流中光束漂移模型的一般表达式,结果表明光束漂移与湍流参数(广义指数参数α、折射率结构参数C_n~2、湍流外尺度L_0和湍流内尺度l_0)以及输入平面上的初始二阶矩有关。以部分相干反常椭圆空心高斯光束(PCAEHGB)为例,对光束漂移的均方根值B_w和相对光束漂移Br进行数值模拟。结果表明,广义指数参数、折射率结构参数、湍流内尺度、湍流外尺度、相干长度和束腰半径越大,Bw和Br越大。当C_n~2=10~(-14) m~(3-α)、传输总路径L=10km时,B_w≈0.22m;当L≈5km时,B_r达到最大。在相同参数条件下,PCAEHGB受湍流的影响比高斯-谢尔模型光束小。
[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 伪, 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-伪) and the total transmission path L=10km, B _ w = 0.22 m, when L 鈮，
本文编号：2438307
[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 伪, 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-伪) and the total transmission path L=10km, B _ w = 0.22 m, when L 鈮，
本文编号：2438307
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