coherence

coherence

coherence constant phase difference in two or more Waves over time. Two waves are said to be in phase if their crests and troughs meet at the same place at the same time, and the waves are out of phase if the crests of one meet the troughs of another. The waves are incoherent if the crests and troughs meet randomly. Coherence underlies a variety of physical phenomena, such as interference and diffraction . Coherence is also responsible for many of the remarkable properties of laser radiation; laser light is coherent, which is to say that the light waves from a laser are all in phase.

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"coherence." The Columbia Encyclopedia, 6th ed.. 2008. Encyclopedia.com. 12 Feb. 2012 <http://www.encyclopedia.com>.

"coherence." The Columbia Encyclopedia, 6th ed.. 2008. Encyclopedia.com. (February 12, 2012). http://www.encyclopedia.com/doc/1E1-coherenc.html

"coherence." The Columbia Encyclopedia, 6th ed.. 2008. Retrieved February 12, 2012 from Encyclopedia.com: http://www.encyclopedia.com/doc/1E1-coherenc.html

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coherence

coherence A measure of the extent to which electromagnetic waves are in step with one another. On an astrophysical scale, maser sources are the most notable emitters of coherent radiation.

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"coherence." A Dictionary of Astronomy. 1997. Encyclopedia.com. 12 Feb. 2012 <http://www.encyclopedia.com>.

"coherence." A Dictionary of Astronomy. 1997. Encyclopedia.com. (February 12, 2012). http://www.encyclopedia.com/doc/1O80-coherence.html

"coherence." A Dictionary of Astronomy. 1997. Retrieved February 12, 2012 from Encyclopedia.com: http://www.encyclopedia.com/doc/1O80-coherence.html

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coherence

coherence Two wave trains which are in phase. Coherence is also an indication of the similarity of two functions and is the frequency domain analogy with correlation in the time domain.

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AILSA ALLABY and MICHAEL ALLABY. "coherence." A Dictionary of Earth Sciences. 1999. Encyclopedia.com. 12 Feb. 2012 <http://www.encyclopedia.com>.

AILSA ALLABY and MICHAEL ALLABY. "coherence." A Dictionary of Earth Sciences. 1999. Encyclopedia.com. (February 12, 2012). http://www.encyclopedia.com/doc/1O13-coherence.html

AILSA ALLABY and MICHAEL ALLABY. "coherence." A Dictionary of Earth Sciences. 1999. Retrieved February 12, 2012 from Encyclopedia.com: http://www.encyclopedia.com/doc/1O13-coherence.html

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coherence

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"coherence." Oxford Dictionary of Rhymes. 2007. Encyclopedia.com. 12 Feb. 2012 <http://www.encyclopedia.com>.

"coherence." Oxford Dictionary of Rhymes. 2007. Encyclopedia.com. (February 12, 2012). http://www.encyclopedia.com/doc/1O233-coherence.html

"coherence." Oxford Dictionary of Rhymes. 2007. Retrieved February 12, 2012 from Encyclopedia.com: http://www.encyclopedia.com/doc/1O233-coherence.html

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Free newspaper and magazine articles

Coherence in Thought and Action.
Magazine article from: The Review of Metaphysics; 9/1/2001
Policy coherence and policy domains.
Magazine article from: Policy Studies Journal; 8/1/2006
Olsson, Erik J. Against Coherence. Truth, Probability, and...
Magazine article from: The Review of Metaphysics; 12/1/2007

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