Beam Divergence

Beam Divergence

Angle of beam spread measured in radians or milliradians (1 milliradian = 3.4 minutes-of-arc or approximately 1 mil). For small angles where the cord is approximately equal to the arc, the beam divergence can be closely approximated by the ratio of the cord length (beam diameter) divided by the distance (range) from the laser aperture.

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Industry/Domain: Industrial machinery
Category: Laser equipment
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beam divergence

Telecommunications; General telecom

Of an electromagnetic beam, in any plane that intersects the beam axis, the increase in beam diameter with distance from the aperture from which the beam emerges. Note 1: Beam ...

Divergence

Industrial machinery; Laser equipment

The increase in the diameter of the laser beam with distance from the exit aperture. The value gives the full angle at the point where the laser radiant exposure or irradiance is ...

Beam

Industrial machinery; Laser equipment

A collection of rays that may be parallel, convergent, or divergent.

Beam

Language; Encyclopedias

An ancient prov. of France, fell to the crown with the accession of Henry IV. in 1589; formed a great part of the dep. of Basses-Pyrénées, capital Pau.

Absorb

Industrial machinery; Laser equipment

To transform radiant energy into a different form accompanied by a rise in temperature.

Absorption Coefficient

Industrial machinery; Laser equipment

Factor describing light's ability to be absorbed per unit of path length.

Accessible Emission

Industrial machinery; Laser equipment

The magnitude of accessible laser (or other collateral) radiation of a specific wavelength or emission duration at a particular point as measured by appropriate methods and ...

Accessible Emission Limit

Industrial machinery; Laser equipment

The maximum accessible emission level limit (AEL) permitted within a particular class. In ANSI Z-136.1, AEL is determined as the product of Accessible Emission times the Maximum ...

Active Medium

Industrial machinery; Laser equipment

Collection of atoms or molecules capable of undergoing stimulated emission at a given wavelength.

Afocal

Industrial machinery; Laser equipment

Literally, "without a focal length"; an optical system with its object and image point at infinity.

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