The state of higher population of excited state species than ground state species
In physics, specifically statistical mechanics, a population inversion occurs while a system (such as a group of atoms or molecules) exists in a state in which more members of the system are in higher, excited states than in lower, unexcited energy states. It is called an "inversion" because in many familiar and commonly encountered physical systems, this is not possible. This concept is of fundamental importance in laser science because the production of a population inversion is a necessary step in the workings of a standard laser.
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In physics, specifically statistical mechanics, a populationinversion occurs while a system (such as a group of atoms or molecules) exists in a state...
of a populationinversion. In 1955, Prokhorov and Basov suggested optical pumping of a multi-level system as a method for obtaining the population inversion...
An inversion is a chromosome rearrangement in which a segment of a chromosome becomes inverted within its original position. An inversion occurs when a...
Look up Inversion or inversion in Wiktionary, the free dictionary. Inversion or inversions may refer to: Inversion (artwork), a 2005 temporary sculpture...
energy states than in the higher energy states. However, when a populationinversion is present, the rate of stimulated emission exceeds that of absorption...
laser, the active gain medium must be changed into a state in which populationinversion occurs. The preparation of this state requires an external energy...
laser construction to pump the active laser medium so as to achieve populationinversion. The technique was developed by the 1966 Nobel Prize winner Alfred...
construction, optical cavity design, the physics of producing a populationinversion in laser media, and the temporal evolution of the light field in...
Blue gas lasers are large and expensive instruments relying on populationinversion in rare gas mixtures which use high currents and large cooling due...
order to get some stimulated emission, it is necessary to create a populationinversion of the atoms. This is done in a way that is very similar to the Stern–Gerlach...
1959 titled "Light Amplifiers Employing Collisions to Produce PopulationInversions" (subsequently amended as a continuation in part and finally issued...
Lasing without inversion (LWI), or lasing without populationinversion, is a technique used for light amplification by stimulated emission without the...
pumped with very high energy, usually from a flashtube, to achieve a populationinversion. The rod is often placed between two mirrors, forming an optical...
respectively.[citation needed] The simple existence of a pumped populationinversion is not sufficient for the observation of a maser. For example, there...
number of particles in the ground state or a less-excited state, populationinversion is achieved. In this condition, the mechanism of stimulated emission...
chemical shifts to undergo populationinversion in the SPI step without its undesirable selectivity. Selective PopulationInversion 180°S — τ — 90°I (Y), 90°S...
positive-temperature system. A standard example of such a system is populationinversion in laser physics. Thermodynamic systems with unbounded phase space...
one sometimes uses negative temperatures to describe systems with populationinversion, which can be considered to have a temperature greater than positive...
rely on two physical phenomena to work, stimulated emission and populationinversion. An atom is made of a nucleus and a number of electrons orbiting...
picosecond) dissociates back into two unbound atoms. This forms a populationinversion.[citation needed] The wavelength of an excimer laser depends on the...
ones). The gain medium is excited by the pump source to produce a populationinversion, and it is in the gain medium where spontaneous and stimulated emission...
allows the gain medium to have a high populationinversion. When the gain medium has the desired populationinversion, the Pockels cell is switched "open"...
faster for closely spaced levels. A populationinversion therefore builds up in the 62S1/2 upper laser level. Inversion occurs between this and the 52P3/2...
ASE is produced when a laser gain medium is pumped to produce a populationinversion. Feedback of the ASE by the laser's optical cavity may produce laser...
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