population inversion

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Related to population inversion: laser

population inversion

The condition of having enough excited or high-energy states distributed throughout a substance to sustain a chain-reaction of stimulated emission. Lasers, for example, require population inversion in order to generate radiation.

American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

Translations

inversione di popolazione

References in periodicals archive ?

A critical step in the lasing is the injection of a large amount of electrical current into the organic layers to achieve a condition called population inversion. However, the high resistance to electricity of many organic materials makes it difficult to get enough electrical charges in the materials before they heat up and burn out.

Going organic: Japanese researchers have fabricated laser diodes using organic materials

The nitrogen molecules from the air absorbed the electric energy and population inversion is created between the 3 upper level and B3 lower level.

ANALYSIS OF TRANSVERSELY ELECTRICAL EXCITED ATMOSPHERIC (TEA) NITROGEN LASER AND DIFFERENT PARAMETERS OF HOMEMADE IGNITION SYSTEM

It is well known fact that working principle of doped fiber amplifier (TDFA under consideration) is population inversion. The gain of TDFA depends on the metastable state ions.