coherent sources

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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 ?
After determining that Wolf's theoryapplies to acoustics as well as to optics, Bocko, Douglass and Knox set up an acoustical experiment with a partially coherent source because it was easier than an optical one.
The AN/SSQ-125 Coherent Source sonobuoy is an A-size, expendable, acoustic source sonobuoy.
Pioneer's S-IW891, S-IW691 and S-IW691L integrate the exclusive Coherent Source Transducer (CST) driver technology that improves off-axis performance and provide a smoother, more accurate frequency response to fundamentally expand a room's "sweet spot.
Pioneer's proprietary Coherent Source Transducer (CST) technology is the truly dramatic advancement that functions to improve off-axis performance and deliver a smoother, more accurate frequency response.
Jones and team incorporated a specialized angled baffle configuration that works with Pioneer's exclusive Coherent Source Transducer (CST) technology to further envelop discerning entertainment enthusiasts into their favorite film and music content.
Plasmon lasers are promising nanoscale coherent sources of optical fields because they support ultra-small sizes and show ultra-fast dynamics.
There are no grounds, on the basis of the argument in the first Critique, to think that the goals reason sets for one can be achieved; nor does Kant's theory provide a basis for defending his conception of reason against other plausible and coherent sources of warranted assertion, such as religion or culture.