population inversion


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Related to population inversion: laser

population inversion

n.
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.
References in periodicals archive ?
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
b): Impulsive phase control of resonant gain and absorption represents a disruptive key technology rivalling the LASER especially in the hard-x-ray domain, where long-lived population inversion in dense media seems impossible.
X-MUSIC: XUV/X-ray Multidimensional Spectroscopy of Fundamental Electron Dynamics and Impulsive Control of X-ray Light
The next way to generate the radiation is using p-Germanium laser which is based on population inversion between light and heavy holes.
Advances in terahertz technology with emphasis on quantum cascade lasers/ Kvantiniu-pakopiniu lazeriu naudojimas terahercinems technologijoms tobulinti
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