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While spatial coherence is concerned with the phase correlation of waves in different observation points, temporal coherence entails the phase correlation of waves at a given point in space at two different instances of time,it is the measure of the average correlation between the value of a wave and itself delayed by a certain period of time depicting the characteristics of how well a wave can create an interference with itself.The delay on which the correlation effect is emphatically low is denoted by the degree of Tc (coherence time)[3], a state at which there is a significant shift in amplitude.
Michelson--Morley experiment
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Showing Temporal Coherence
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When one of the mirrors is moved away gradually, the time for the beam to travel increases and the infringes become dull and finally are lost
Young's interference experiment
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----Showing spatial coherence
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If the space between the two slits is increased, the coherence dies gradually and finally the infringes disappear
Ø References
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1. Interference and coherence definitions \[Online source\] Url:[http://en.wikipedia.org/wiki/Coherence_%28physics%29] |
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2<ac:structured-macro ac:name="anchor" ac:schema-version="1" ac:macro-id="4a921891-22af-4fac-9455-01c955c0363f"><ac:parameter ac:name="">2</ac:parameter></ac:structured-macro>2.Interference and Coherence applet \[Online source\] Url:[http://serc.carleton.edu/NAGTWorkshops/deepearth/activities/40826.html] |
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3.Temporal and spatial coherence definitions \[Online source\] Url:[http://en.wikipedia.org/wiki/Coherence_%28physics%29] |
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4. Interference description \[Online source\] |