TERMIUM Plus®

The Government of Canada’s terminology and linguistic data bank.

POPULATION INVERSION [2 records]

Record 1 2012-04-17

English

Subject field(s)
  • Lasers and Masers
CONT

When more molecules (atoms, ions) in a laser are in a metastable state than in the ground state (a situation needed for sustaining a high rate of stimulated emissions), a "population inversion" is said to exist. Without a population inversion, there can be no lasing action.

French

Domaine(s)
  • Masers et lasers
DEF

Inversion des conditions d'équilibre thermique due à un changement de l'état énergétique du semi-conducteur; la probabilité d'occupation de la bande de conduction est supérieure à celle de la bande de valence.

Spanish

Save record 1

Record 2 1979-01-24

English

Subject field(s)
  • Electromagnetic Radiation
  • Atomic Physics
  • Optics
DEF

A nonequilibrium condition that exists when there are more atoms in the excited state than in the ground state.

French

Domaine(s)
  • Rayonnements électromagnétiques
  • Physique atomique
  • Optique
CONT

Pour observer véritablement une amplification de l'onde incidente (...) il faut produire une inversion des populations, c'est-à-dire réaliser des conditions spéciales où les atomes à l'état d'énergie supérieure sont plus nombreux que les atomes à l'état inférieur (...)

Spanish

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