In the case of lidar, the waves are in the form of an infra-red laser beam.

至于激光雷达，电磁波是以红外激光束的形式发射的。

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It is easy to set up: simply hook up infra-red laser transceivers on top of two buildings and then align them.

便易安装：将两座建筑顶端的红外线激光收发器简单地连接起来，然后将它们调整成行即可。

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And then since we have my red laser pointer, we will also try with the red laser pointer, which is centered at wavelength of 700 nanometers.

然后因为我们有我的红色激光笔，我们也可以用它试一下，它的波长集中在700纳米处。

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And then since we have my red laser pointer, we will also try with the red laser pointer, which is centered at wavelength of 700 nanometers.

然后因为我们有我的红色激光笔，我们也可以用它试一下，它的波长集中在700纳米处。

麻省理工公开课 - 化学原理课程节选

But luckily we had the control of the red laser pointer where nothing moved at all.

但是很幸运我们可以,控制红色激光笔,虽然什么都没有移动。

麻省理工公开课 - 化学原理课程节选

Also, what's the energy per photon of this red laser pointer, and then it's also worth trying a calculation dealing with intensity. So let's also try calculating the numbers of photons that would be emitted by this laser pointer, if, for example, we were to use it for 60 seconds and this were a one milliwatt laser.

同样，红色激光笔的,每个光子能量是多少，这也值得用处理强度的方法计算一下,让我们也计算一下,有多少光子会从这个激光笔射出，举个例子，如果我们使用它持续60秒,这里会有一毫瓦的激光。

麻省理工公开课 - 化学原理课程节选

In the case of lidar, the waves are in the form of an infra-red laser beam.

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