coherence length


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coherence length

[kō′hir·əns ‚leŋkth]
(physics)
For a beam of particles, the typical length of a wave packet along the beam; the more monochromatic the beam, the greater its coherence length.
(solid-state physics)
A measure of the distance through which the effect of any local disturbance is spread out in a superconducting material. Also known as coherence distance.
References in periodicals archive ?
The specifications for selecting a laser segment discusses wavelength, coherence length, beam divergence, and Rayleigh range.
However, the resolution of a coherent optical sensor depends on the coherence length of a light source [7].
In neutron-diffraction studies of B2-ordered Fe-Al alloys, a correlation of the magnetic moments with a coherence length of about 5 nm was revealed [6].
When the optical lengths of the sample and reference path are almost equal (i.e., the difference is no more than the source coherence length), the interference pattern becomes visible.
OCT takes the advantage of short coherence length of broadband light sources to perform micrometer-scale, cross-sectional imaging of biologic tissue sample.
This project will unravel the mechanism of high-temperature superconductivity in H3S, derive design principles, and find new high-temperature superconductors.We will measure key parameters of the superconducting state in H3S including the London penetration depth, coherence length, superconducting gap, charge carrier concentration, electron-phonon coupling, and Fermi surface topology as well as the isotope effect on these.
where [[rho].sub.0] = [(0.546[C.sup.2.sub.n][k.sup.2]L).sup.-3/5] is the coherence length of a spherical wave propagating in turbulence.
These studies shown that the size of the fluctuation effects vary inversely proportional to the coherence length x, which determines the spatial response of superconductor.
Interference fringes occur with backreflected light under the condition that both path lengths match to within the coherence length of the light.
Specifically in triple-axis diffractometer measurements, the broadening of the rocking curve ([omega]-scan or angular-scan) of the symmetric (0002), (0004), and (0006) reflections for the epitaxial layer is influenced only by the [[alpha].sub.tilt] angle and short coherence length parallel to the substrate surface [L.sub.P] [8,9,21, 23].