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Essay

Lasers And Their Uses

Essay specific features

 

Issue:

Science

 

Written by:

Thomas T

 

Date added:

May 24, 2012

 

Level:

University

 

Grade:

A

 

No of pages / words:

4 / 847

 

Was viewed:

6417 times

 

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Essay content:

It stands for "light amplification by stimulated emission of radiation". They produce a narrow, intense beam of coherent light. In a laser the atoms or molecules of a crystal, like ruby or garnet-or of a gas, liquid, or other substance-are excited so that more of them are at higher energy levels than are at lower energy levels...
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They produce a narrow, intense beam of coherent light. In a laser the atoms or molecules of a crystal, like ruby or garnet-or of a gas, liquid, or other substance-are excited so that more of them are at higher energy levels than are at lower energy levels. If a photon whose frequency corresponds to the energy difference between the excited and ground states strikes an excited atom, the atom is stimulated, as it falls back to a lower energy state, to emit a second photon of the same frequency, in phase with and in the same direction as the bombarding photon...
displayed 300 characters

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