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ENE 451

ENE 451. Fundamental of Optical Engineering Lecture 6 extra. Interference. This can occur when 2 or more waves overlap each other in space. Assume that 2 waves have the same frequency. The interference results in an addition of wave amplitudes. Interference.

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ENE 451

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  1. ENE 451 Fundamental of Optical Engineering Lecture 6 extra

  2. Interference • This can occur when 2 or more waves overlap each other in space. • Assume that 2 waves have the same frequency. • The interference results in an addition of wave amplitudes.

  3. Interference • Two wave interference: the resulting field becomes

  4. Interference • Power density, PA

  5. Interference

  6. Interference • If lights behave without interference, we would expect where E1 and E2 are orthogonal. • If there is an interference, it is clearly seen that the term is the term for “interference”.

  7. Interference • PA is max for 1 - 2= 0, 2, …, 2N • PA is min for 1 - 2= , 3, …, (2N+1) • Therefore,

  8. Examples of interference

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