衍射理论的另一个重要应用就是研究准直光束的远场发散角。
Another important application of diffraction theory is the study of the far field divergence Angle of a collimated light beam.
可是，由于存在着多种影响收敛和发散的机制和力量，至今，我们仍难以用一个完整的理论来解释各国（地区）的经济增长经验以及兴盛、衰落。
Since there exist many kinds of mechanism and force working on convergence or divergence, we can hardly use one integrated theory to explain the development of economy up to now.
根据捕获跟踪策略和激光检测理论，给出了直接探测情况下最佳光束发散角的表示式。
According to acquisition and tracking strategy and laser detection theory, an expression of the best Angle of beam divergence under direct detection is provided.
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