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Chapter 24
Chapter 24

Key Point: The wave model of light that is so well establishe needs
Key Point: The wave model of light that is so well establishe needs

... Not C or D: The light may be brighter or dimmer depending on the power of the light source. Note: It will probably appear to be brighter, because the light sources will be of similar power, but our eyes are more sensitive to green light. It’s either A or B: To answer this they have to remember what ...
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Unit 18 - HKU Physics
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... • Lasers are sources of coherent radiation • Coherence is associated with the wave like nature of light • Coherence manifests itself in – Interference – Diffraction • Temporal coherence – In the direction of travel (wave vector k) – Important in amplitude splitting - Michelson Interferometer • Later ...
Chapter 33 The Nature And Propagation Of Light
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... the use of instructors in teaching their courses and assessing student learning. Dissemination or sale of any part of this work (including on the World Wide Web) will destroy the integrity of the work and is not permitted. The work and materials from it should never be made available to students exc ...
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Chapter 24 Lecture Notes

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Electromagnetic Waves

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Slide 1 - Mr Lundy`s Room

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Coherence (physics)

In physics, two wave sources are perfectly coherent if they have a constant phase difference and the same frequency. It is an ideal property of waves that enables stationary (i.e. temporally and spatially constant) interference. It contains several distinct concepts, which are limiting cases that never quite occur in reality but allow an understanding of the physics of waves, and has become a very important concept in quantum physics. More generally, coherence describes all properties of the correlation between physical quantities of a single wave, or between several waves or wave packets. Interference is nothing more than the addition, in the mathematical sense, of wave functions. A single wave can interfere with itself, but this is still an addition of two waves (see Young's slits experiment). Constructive or destructive interferences are limit cases, and two waves always interfere, even if the result of the addition is complicated or not remarkable.When interfering, two waves can add together to create a wave of greater amplitude than either one (constructive interference) or subtract from each other to create a wave of lesser amplitude than either one (destructive interference), depending on their relative phase. Two waves are said to be coherent if they have a constant relative phase. The amount of coherence can readily be measured by the interference visibility, which looks at the size of the interference fringes relative to the input waves (as the phase offset is varied); a precise mathematical definition of the degree of coherence is given by means of correlation functions. Spatial coherence describes the correlation (or predictable relationship) between waves at different points in space, either lateral or longitudinal. Temporal coherence describes the correlation between waves observed at different moments in time. Both are observed in the Michelson–Morley experiment and Young's interference experiment. Once the fringes are obtained in the Michelson–Morley experiment, when one of the mirrors is moved away gradually, the time for the beam to travel increases and the fringes become dull and finally are lost, showing temporal coherence. Similarly, if in Young's double slit experiment the space between the two slits is increased, the coherence dies gradually and finally the fringes disappear, showing spatial coherence.
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