The Virginia Tech team put a laser sensor on the front of the car to look for activity in nearby areas.

VOA: special.2009.11.03

So this gives you a little bit of an idea of just how many individual photons there are in a laser beam of light. This is a huge number of photons.

这个给你们一点思路关于,一个激光束有多少独立的光子,这是一个巨大的光子数目。

麻省理工公开课 - 化学原理课程节选

This angelic laser begins slowly the gradual process in some kind of extraordinary science-fiction sort of way of transforming the virginal human body to the essence of the soul itself.

这天国的激光开始了这渐渐的过程,用一种很特别的科幻小说的方式,把人纯净的身体变成灵魂的精髓。

耶鲁公开课 - 弥尔顿课程节选

Doctors Charles Campbell and Charles Koester used a laser to remove a tumor from a patient's eye at Columbia-Presbyterian Hospital in New York City.

VOA: special.2010.09.01

Intensity, if we increase the intensity, we're not increasing the energy in each photon, we're just increasing the number of photons that we're shooting out of our laser, whatever our light source is.

强度，如果我们增加强度，我们增加的不是,每个光子的能量，我们增加的仅仅是,从我们激光源射出的光子数，无论我们的光源是什么。

麻省理工公开课 - 化学原理课程节选

In Theodore Maiman's first laser, a rod of man-made ruby supplied the electrons.

VOA: special.2010.09.01

So we see that we do not eject electrons in the case of the laser pointer, even if we have this intensity, it is still not related to the energy of an individual photon, so we won't see an effect.

所以我们看到我们用激光笔,还是没有逐出电子，即使我们有这样的强度，它仍然与一个单个的光子能量无关,所以我们不会看到光电效应。

麻省理工公开课 - 化学原理课程节选

Its ultimate aim is to build a series of laser tracking stations in various countries to provide a defensive shield for activity in space.

VOA: standard.2010.07.24

Lang lives in the San Francisco bay area. He is a laser physicist and graduate of the California Institute of Technology, and has nearly 50 U.S.patents to his name.

VOA: standard.2010.03.17