Opticalcoherencetomography

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In long-distance transmission systems, the coherence length may be reduced by propagation factors such as dispersion, scattering, and diffraction.

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Linewidth

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Coherent light

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The expression above is a frequently used approximation. Due to ambiguities in the definition of spectral width of a source, however, the following definition of coherence length has been suggested[citation needed]:

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Ledcoherence

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In physics, coherence length is the propagation distance from a coherent source to a point where an electromagnetic wave maintains a specified degree of coherence. The significance is that interference will be strong within a coherence length of the source, but not beyond it. This concept is also commonly used in telecommunication engineering.

Coherence

Superconductingcoherence length

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Coherencetime

where c is the speed of light in a vacuum, n is the refractive index of the medium, and Δf is the bandwidth of the source.

Helium-neon lasers have a typical coherence length of 20 cm, while semiconductor lasers reach some 100 m. Fiber lasers can have coherence lengths exceeding 100 km.

The coherence length is the optical path length difference of a self-interfering laserbeam which corresponds to a 50% fringe visibility, where the fringe visibility is defined as

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where λ is the central wavelength of the source, n is the refractive index of the medium, and Δλ is the spectral width of the source.

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