Population Inversion

Population Inversion

A state in which a substance has been energized, or excited, so that more atoms or molecules are in a higher excited state than in a lower resting state. This is a necessary prerequisite for laser action.

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Industry/Domain: Industrial machinery
Category: Laser equipment
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population inversion

Materials science; Material physics

A situation where a metastable excited state has a larger occupation number than the ground state. This is usually achieved by continuous excitation, by radiation of the ...

Population

Geography; Countries & Territories

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Inversion

Biology; Genetics

A chromosomal rearrangement characterized by rotation and reintegration of a DNA segment, resulting in an inverted orientation of the segment relative to its typical state.

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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