激光器是将光放大，产生光束的设备。它是一种距离远、直线性、单色光，它有固体、气体、半导体、液体。
Lasers are devices which amplify and produce beams of light which are very distance, directional, and pure in color. They can be solid state, gas, semiconductor, or liquid.
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.
光束模式展开法可用于近似计算远场的弱截断光束。
The beam expansion method is suited to approximate the weakly truncated beams in the far field.
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