A team of physicists in the us has created an infrared laser beam at a point in mid air, by focusing a UV laser onto a tiny volume of oxygen molecules.

美国的一个物理学家团队通过将一束紫外激光聚焦于一小块氧分子中，发明了一种聚焦于半空中一点的红外激光束。

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But what they noticed was that even when they turned the flame off they were still getting a signal - in other words, the laser was breaking up as well as exciting the oxygen.

但他们发现，即使将火焰熄灭，仍可以获得一个信号——换句话说，就是激光在激发氧原子的同时也分成了两束。

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It's suitable for: oxygen, nitrogen making, dental therapeutic apparatus, instruments and meters, food packaging, laser cutting, and many other industries.

它的适用范围：制氧、制氮、牙科治疗仪、仪器仪表、食品包装、激光切割等诸多行业。

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