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 ?
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.
Interference fringes occur with backreflected light under the condition that both path lengths match to within the coherence length of the light.
Coherence length is over 3 metres with peak pulse power at 40, 120 and 300 kW respectively.
In the case where the inner scale of turbulence is smaller than the spatial coherence length of the optical wave, we base our calculations on the conventional Kolmogorov spectrum [[PHI].
1-3) When the optical path length of light backscattered from the sample and light reflected from the reference mirror are within the coherence length of the light source, constructive interference occurs, and a signal is generated.
where [MATHEMATICAL EXPRESSION NOT REPRODUCIBLE IN ASCII] is the coherence length of a spherical wave propagating in the slant atmospheric turbulence and [C.
Examples include laser cavity optimization, adjustment of beam delivery optics, measurement of laser beam coherence length, and general applications requiring fine adjustment of lenses, mirrors, and other position-sensitive photonic components Newport Corp.
The coherence length of each of these lasers is approximately a few centimeters.
which corresponds to the (001) diffraction, is estimated from the Scherrer relation to have a very high coherence length of 168 A (18, 22).
The Scorpion SMPF-2030 also features long coherence length (>50 kin), high mode stability (+/-30 MHz/hour), closed loop RIN suppression system and low phase noise.
The large line width corresponds to a medium coherence length of 15 cm to 30 cm, considerably less than the typical 1-m to 2-m fiber pigtail or patchcord length used during testing.
In NbTi this is not a problem because the superconducting coherence length is several orders of magnitude greater than the grain-boundary thickness, and the attentuation at each boundary is negligible.