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laser    音标拼音: [l'ezɚ]
n. 激光

镭射

laser
雷射

laser
雷射

laser
n 1: an acronym for light amplification by stimulated emission
of radiation; an optical device that produces an intense
monochromatic beam of coherent light [synonym: {laser},
{optical maser}]

laser \laser\ n. [acronym from Light Amplification by Stimulated
Emission of Radiation: ca. 1955.]
A device which produces an intense, usually narrow,
monochromatic beam of coherent light; called also {optical
maser}. It has various forms, and is used in various
applications in science and technology. The beam is produced
by boosting the majority of the electrons in specific
radiation-absorbing atoms in a medium into a higher energy
level, from which they are stimulated by their own emitted
radiation to drop back synchronously to their lower energy
level, and emit light which is in phase (coherent).

Syn: optical maser.
[WordNet 1.5]

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  • Laser - Wikipedia
    The first chemical laser was demonstrated in 1965 by Jerome V V Kasper and George C Pimentel at the University of California, Berkeley It was a hydrogen chloride laser operating at 3 7 micrometers
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    An explanation of lasers and their uses from NIST's William D Phillips, who shared the 1997 Nobel Prize in Physics for his pioneering work in using lasers to cool atoms to temperatures near absolute zero Dr Phillips leads NIST's Laser Cooling and Trapping Group, which continues to make fundamental discoveries in atomic, molecular, and optical physics, and is active in science education and
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    The letters in the word laser stand for L ight A mplification by S timulated E mission of R adiation A laser is an unusual light source It is quite different from a light bulb or a flash light Lasers produce a very narrow beam of light This type of light is useful for lots of technologies and instruments—even some that you might use at home! How does a laser work? Light travels in waves
  • How Lasers Work - HowStuffWorks
    Lasers are used in dental drills, eye surgery and even tattoo removal But what exactly is a laser? There are numerous types, but all lasers work basically the same way Learn how they generate such concentrated beams of light
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    Laser Gain Media To understand what a laser gain material is, it’s first necessary to understand the process of stimulated emission Quantum mechanics tells us that atoms and molecules can only exist at certain specific, discrete energy levels The lowest energy level is called the ground state, while higher energy levels are known as excited states Normally, the temperature of a material





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