beam divergence


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beam divergence

[′bēm də‚vər·jəns]
(optics)
The angle between points on opposite sides of a light beam at which the irradiance drops to 1/ e (0.37) times its maximum value.
(physics)
The angular spread in the directions of the components of a beam of particles or radiation.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.

beam divergence

(Brit.) Same as beam spread.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.
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References in periodicals archive ?
Given being at a safe distance from the target is invaluable for soldiers, the pointing stability and the laser beam divergence have panned out to be as prominent factors in laser designation.
Beam divergence and lens coating will also determine the dot's shape across the entire illumination range.
If it is far from the source, and close to the detector, the beam divergence becomes relatively narrow.
Important parameters such as beam divergence and transmitter power depend on pointing accuracy as well and thus, influence the laser terminal design.
In addition, it was revealed in [16] that OAM multiplexing can only be applicable to short range distance communication due to the beam divergence. Regarding the controversy, it should be noted that OAM and MIMO have intersection when using UCA to produce OAM; however, they are absolutely two different domains.
Edge-emitting laser is typically used in many approaches to improve their vertical beam divergence as multi active region [1], double barrier separate confinement heterostructure [2] and inserting anti- guiding layers [3, 4].
The LOS links are also of two types, one is directed LOS in which the transmitter and receiver are directed towards each other with narrow transmitter semi beam divergence angle and smaller receiver FOV as shown in Fig.
We want to point out that the reduction of the beam wander of the partially coherent beams sacrifices the beam divergence because the angular spread of the beam become far large with the decrease of the coherence length.