beam spreading 束散 ; 光束扩展
A modified light diffusion solution model was proposed from a heuristic version of beam spreading (BS) model and diffusion approximation (DA) theory.
受到光束扩散模型和漫射近似理论的启发，提出了一种改进的光传输求解模型。
The expression of optical-beam wander is obtained from above long-term optical-beam spreading formula and the MA.
应用上面长期光束扩展半径表达式和马尔可夫近似获得了光束漂移表达式。
The results show that the obscuring ratio has obvious influence on the beam spreading in weak turbulence.
结果表明，对于均强聚焦光束湍流大气传输，在弱湍流效应条件下，光斑扩展受遮拦比影响较大；
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