Experimental and numerical study of underwater beam propagation in a Rayleigh-Benard turbulence tank

Nootz Gero; Matt Silvia; Kanaev Andrey; Judd Kyle P.; Hou Weilin

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Experimental and numerical study of underwater beam propagation in a Rayleigh-Benard turbulence tank

机译：瑞利奔料湍流箱水下梁繁殖的实验与数值研究

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The propagation of a laser beam through Rayleigh-Benard (RB) turbulence is investigated experimentally and by way of numerical simulation. For the experimental part, a focused laser beam transversed a 5 m x 0.5 m x 0.5 m water filled tank lengthwise. The tank is heated from the bottom and cooled from the top to produce convective RB turbulence. The effect of the turbulence on the beam is recorded on the exit of the beam from the tank. From the centroid motion of the beam, the index of refraction structure constant C-n(2) is determined. For the numerical efforts RB turbulence is simulated for a tank of the same geometry. The simulated temperature fields are converted to the index of refraction distributions, and C-n(2) is extracted from the index of refraction structure functions, as well as from the simulated beam wander. To model the effect on beam propagation, the simulated index of refraction fields are converted to discrete index of refraction phase screens. These phase screens are then used in a split-step beam propagation method to investigate the effect of the turbulence on a laser beam. The beam wander as well as the index of refraction structure parameter C-n(2) determined from the experiment and simulation are compared and found to be in good agreement. (C) 2017 Optical Society of America

机译：通过数值模拟研究了激光束通过瑞利奔蚁（RB）湍流的传播。对于实验部分，聚焦激光束纵向横向5米×0.5M×0.5M的水填充罐。罐从底部加热并从顶部冷却以产生对流RB湍流。湍流对光束上的效果被记录在来自罐的光束的出口上。从光束的质心运动，确定折射结构常数C-N（2）的索引。对于数值努力，对同一几何形状的罐模拟RB湍流。模拟温度场转换为折射率分布，并且从折射结构函数的索引中提取C-N（2），以及模拟光束漂移。为了模拟对光束传播的影响，将折射率的模拟索引转换为离散折射率折射率。然后在分流步进光束传播方法中使用这些相屏来研究湍流对激光束的影响。比较来自实验和仿真确定的折射率和折射结构参数C-N（2）的索引，并发现良好的一致性。（c）2017年光学学会

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《Applied optics》 |2017年第22期|共8页
作者
Nootz Gero; Matt Silvia; Kanaev Andrey; Judd Kyle P.; Hou Weilin;
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Naval Res Lab Natl Res Council Res Associate 1009 Balch Blvd Stennis Space Ctr MS 39529 USA;

Naval Res Lab Ocean Sci Branch Stennis Space Ctr MS 39529 USA;

Naval Res Lab Appl Opt Branch Washington DC 20375 USA;

Naval Res Lab Appl Opt Branch Washington DC 20375 USA;

Naval Res Lab Ocean Sci Branch Stennis Space Ctr MS 39529 USA;

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Experimental and numerical study of underwater beam propagation in a Rayleigh-Benard turbulence tank

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