TIME-DEPENDENT PROPAGATION OF HIGH-ENERGY LASER-BEAMS THROUGH ATMOSPHERE
TIME-DEPENDENT PROPAGATION OF HIGH-ENERGY LASER-BEAMS THROUGH ATMOSPHERE
复制标题
DOI：
10.1007/bf00896333
复制
发表时间：
1976-01-01
期刊：
影响因子：
--
通讯作者：
FEIT, MD
中科院分区：
文献类型：
--
作者：
FLECK, JA;MORRIS, JR;FEIT, MD
本文描述了激光束在三维空间中传输时变的计算。该方法适用于高能激光束通过大气中的水平风和湍流的存在下，为大多数情况下的利益的传播。可能的情况是连续波光束通过滞止区的传播，多脉冲传播，包括脉冲自晕的自洽处理，以及涉及跨音速回转的传播。本文用离散傅里叶变换方法在菲涅耳近似下求解了麦克斯韦波动方程，令人惊讶地，它对衍射问题给出了很好的结果。后者为任何求解方法的准确性提供了严格的测试。在求解流体动力学方程时，也相当多地使用了离散傅立叶变换方法。湍流的处理是基于在每个计算步骤中沿传播路径沿着产生随机相位屏。在与时间相关的计算中，随机相位屏可以在给定的传播位置随风移动，或者在每个连续的时间重新产生。
The computation of time-dependent three-space-dimensional laser beam propagation is described. The methods are applicable to the propagation of high energy laser beams through the atmosphere in the presence of a horizontal wind and turbulence for most situations of interest. Possible cases are propagation of cw beams through stagnation zones, multi-pulse propagation, including the self-consistent treatment of pulse self-blooming, and propagation involving transonic slewing. The solution of the Maxwell wave equation in Fresnel approximation is obtained by means of a discrete Fourier transform method, which, surprisingly, gives excellent results for diffraction problems. The latter provide a stringent test for the accuracy of any solution method. Considerable use is also made of discrete Fourier transform methods in solving the hydrodynamic equations. The treatment of turbulence is based on the generation of random phase screens at each calculation step along the propagation path. In a time-dependent calculation the random phase screens can be either made to move with the wind at a given propagation position or generated anew for each successive time.