What Defines Coherent Sources?

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SUMMARY

Coherent sources are defined as sources that maintain the same frequency and a constant phase difference. While some literature suggests that a constant phase difference alone qualifies as coherence, this is misleading. If two waves have different frequencies, they cannot maintain a constant phase difference over time. Therefore, both the same frequency and a constant phase difference are essential for coherence.

PREREQUISITES
  • Understanding of wave properties, specifically frequency and phase difference
  • Basic knowledge of wave interference and superposition principles
  • Familiarity with concepts of coherent and incoherent sources in physics
  • Knowledge of mathematical representation of waves, including sine and cosine functions
NEXT STEPS
  • Research the mathematical conditions for wave coherence in physics
  • Explore the implications of phase difference in wave interference patterns
  • Learn about applications of coherent sources in technologies like lasers and telecommunications
  • Study the differences between coherent and incoherent sources in practical scenarios
USEFUL FOR

Students of physics, educators teaching wave mechanics, and professionals in fields involving wave technology, such as optics and telecommunications.

Amith2006
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Sir,
Coherent sources are defined as sources having same frequency and constant phase difference. In some books it is given that coherent sources have constant phase difference only. Which is correct?
 
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If two waves had different frequencies would they have a constant phase difference?

~H
 
Constant phase difference will do as this in effect would mean that the sources possesses the same frequency.
But the reverse is not applicable.
Frequency can remain same with varying phase difference over time .
 

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