星火的回答是：射出去6英里远的激光到大气中间层，测量失真，然后调整激光的反射镜直到光束背对焦点。

Starfire’s answer: Shoot a laser 56 miles into themesosphere and measure the distortion. Then adjust the laser’smirrors until the beam is back in focus.

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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.

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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.

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