慧差光束通过海洋湍流的传输特性

发布时间：2018-04-27 23:09

本文选题：物理光学 + 慧差　；参考：《中国激光》2017年08期

【摘要】：随着水下光通信、传感和激光雷达等技术的快速发展,深入研究海洋湍流对光束传输特性的影响具有重要的意义。采用数值模拟方法研究了慧差光束通过海洋湍流的传输特性。研究结果表明:海洋湍流会导致光束慧形分布消失;慧差光束的质心位置与最大光强位置不重合;相比于以最大光强位置为中心,以光束质心位置为中心时计算得到的束宽要小,但其受海洋湍流影响更大;以能量Strehl比作为评价参数时,慧差越严重,则光束能量集中度受海洋湍流影响越小;以β参数作为评价参数时,当慧差系数取某特定值时,光束能量集中度受海洋湍流的影响最大,在实际应用中应该避免这种情况。能量Strehl比与β参数的物理含义不同,按照给定桶半径内所含能量定义的能量集中度(能量Strehl比)与按照给定桶中功率百分比定义的能量集中度(β参数)受海洋湍流的影响是不同的,这在实际应用中应当特别注意。
[Abstract]:With the rapid development of underwater optical communication, sensing and lidar, it is of great significance to study the influence of ocean turbulence on beam propagation. Numerical simulation is used to study the propagation characteristics of the oblique beam through ocean turbulence. The results show that ocean turbulence will lead to the disappearance of the beam shape distribution, the mismatch between the center of mass of the beam and the position of the maximum light intensity, and the difference between the position of the center of mass and the position of the maximum light intensity. When the beam center is centered on the center of the beam, the beam width is smaller, but it is more affected by the ocean turbulence, and when the energy Strehl ratio is used as the evaluation parameter, the more serious the wisdom difference is, the less the influence of ocean turbulence on the energy concentration of the beam is. When 尾 parameter is used as the evaluation parameter, the energy concentration of the beam is most affected by ocean turbulence when the coefficient of wisdom difference is taken as a certain value, which should be avoided in practical application. The physical meaning of the energy Strehl ratio is different from that of the 尾 parameter. The energy concentration (energy Strehl ratio) defined according to the given barrel radius is different from the energy concentration (尾 parameter) defined by the given bucket power percentage, which should be paid special attention in practical application.
【作者单位】：四川师范大学物理与电子工程学院;
【基金】：国家自然科学基金(61475105)
【分类号】：O43

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