Coherent light

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

Ledcoherence

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Opticalcoherencetomography

相干长度

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He-Nelaser

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For an electromagnetic wave, the coherence time is the time over which a propagating wave (especially a laser or maser beam) may be considered coherent, meaning that its phase is, on average, predictable.

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Coherence length

A single mode fiber laser has a linewidth of a few kHz, corresponding to a coherence time of a few hundred microseconds. Hydrogen masers have linewidth around 1 Hz, corresponding to a coherence time of about one second.[1] Their coherence length approximately corresponds to the distance from the Earth to the Moon.

Coherencetime

Superconductingcoherence length

The coherence time, usually designated τ, is calculated by dividing the coherence length by the phase velocity of light in a medium; approximately given by τ = 1 Δ ν ≈ λ 2 c Δ λ {\displaystyle \tau ={\frac {1}{\Delta \nu }}\approx {\frac {\lambda ^{2}}{c\,\Delta \lambda }}} where λ is the central wavelength of the source, Δν and Δλ is the spectral width of the source in units of frequency and wavelength respectively, and c is the speed of light in vacuum.

The object of this experiment is to estimate the coherence length for several different sources using a Michelson Interferometer. In addition, the difference in ...

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As of 2022, research groups worldwide have demonstrated superconducting qubits with coherence times up to several 100 μs.[2]

If the angle is greater than zero we calculate the diffuse color by multiplying the basic light color by the constant diffuse intensity and then scaling the ...