Take laser transmission, for example. "High powers concentrated in a narrow laser beam could cause serious damage to a person, " says Karalis.

拿激光传输来说，卡拉里斯就称：“大量能量聚集成一束狭窄的激光束，可能会给人造成严重伤害。”

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Moreover, engineers have worked out how to make laser beams more intense by using short lengths of optical fibre to narrow the beam.

此外，工程师们还通过光纤的短长缩小了传送的光束，由此找到了让激光传送器能源更加密集的方法。

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This laser beam covers a very narrow range of frequencies.

这种激光束的频率范围很窄。

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Moreover, engineers have worked out how to make laser beams more intense by using short lengths of optical fibre to narrow the beam.

ECONOMIST: Monitor

It works by scanning a laser beam across an object and manipulating the reflected light to produce an extremely narrow focal plane.

ECONOMIST: The Archimedes palimpsest: Eureka! | The