coherent sources

(redirected from coherent source)
Also found in: Encyclopedia.

coherent sources 

If light beams from two independent sources reach the same point in space, there is no fixed relationship between the phases of the two light beams and they will not combine to form interference effects. Such light waves are called incoherent. If, on the other hand, the two light beams are superimposed after reaching the same point by different paths but are both radiated from one point of a source, interference effects will be seen because the phase difference in the two beams is constant. The two virtual sources from which these two beams are apparently coming are called coherent sources and any rays in which there is a constant phase difference are called coherent rays. Prior to the advent of the laser, the only way in which one could obtain coherent rays was by dividing the light coming from a point source into two parts. See Young's experiment; holography; clinical maxwellian view system; optical coherence tomography.
References in periodicals archive ?
The spatial smoothing technique can be applied to resolve even more coherent sources in the expense of decreasing aperture.
Plonus, "Optical beam propagation for a partially coherent source in the turbulent atmosphere," J.
The design of amplifiers integral to a feed-forward system is based on the phase coherent source concept.
By combing the SS or MR techniques with subspace-based algorithms, several DOA estimation algorithms have been developed to handle the scenarios where uncorrelated and coherent sources coexist [9-13].
The classical limit calculations for interatomic distance between two coherent sources depend on detached-electron energy as well as photon energy.
Furthermore, the steering vector of coherent source and noise subspace are not orthogonal anymore and the subspace approaches such as MUSIC do not work well.
Knox, also of the University of Rochester, show that lines from a partially coherent source can be shifted to the red or the blue according to Wolf's prediction.
Vector z amounts to the received data from a coherent source vector b.
These lasers would typically be used in high-volume markets, such as fibre to the premises, high capacity, optical communication links in data-centres and as coherent sources for trace gas sensing.'
Plasmon lasers are promising nanoscale coherent sources of optical fields because they support ultra-small sizes and show ultra-fast dynamics.