相干时间

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Coherent light

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相干长度

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.

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Superconductingcoherencelength

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Linewidth

Ledcoherence

These compact, high-resolution, infinite conjugate lenses are ideal for unmanned aerial vehicle (UAV) and other mobile robotics systems.

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]:

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.

Opticalcoherencetomography

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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.

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Coherencetime

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

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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.