In physics, specifically statistical mechanics, a population inversion occurs when a system (such as a group of atoms or molecules) exists in a state in...

An inversion is a chromosome rearrangement in which a segment of a chromosome becomes inverted within its original position. An inversion occurs when a...

of a population inversion. In 1955, Prokhorov and Basov suggested optical pumping of a multi-level system as a method for obtaining the population inversion...

other neon transitions were investigated to identify ones in which a population inversion could be achieved. The 633 nm line was found to have the highest...

laser, the active gain medium must be changed into a state in which population inversion occurs. The preparation of this state requires an external energy...

specific proportions vary according to the particular laser. The population inversion in the laser is achieved by the following sequence: electron impact...

Look up Inversion or inversion in Wiktionary, the free dictionary. Inversion or inversions may refer to: Inversion (artwork), a 2005 temporary sculpture...

1959, titled "Light Amplifiers Employing Collisions to Produce Population Inversions" (subsequently amended as a continuation in part and finally issued...

the electrons of the dopant atoms that a population inversion can be produced, and this population inversion is essential for the stimulated emission...

energy states than in the higher energy states. However, when a population inversion is present, the rate of stimulated emission exceeds that of absorption...

positive-temperature system. A standard example of such a system is population inversion in laser physics. Thermodynamic systems with unbounded phase space...

pumped with very high energy, usually from a flashtube, to achieve a population inversion. The rod is often placed between two mirrors, forming an optical...

faster for closely spaced levels. A population inversion therefore builds up in the 62S1/2 upper laser level. Inversion occurs between this and the 52P3/2...

one sometimes uses negative temperatures to describe systems with population inversion, which can be considered to have a temperature greater than positive...

respectively.[citation needed] The simple existence of a pumped population inversion is not sufficient for the observation of a maser. For example, there...

optical switch is inserted in the laser cavity waiting for a maximum population inversion in the neodymium ions before it opens. Then the light wave can run...

organic lasers Laser dye photostability Laser crystals Lasing without population inversion Electromagnetically induced transparency Optics communications Digital...

order to get some stimulated emission, it is necessary to create a population inversion of the atoms. This is done in a way that is very similar to the Stern–Gerlach...

construction, optical cavity design, the physics of producing a population inversion in laser media, and the temporal evolution of the light field in...

chemical shifts to undergo population inversion in the SPI step without its undesirable selectivity. Selective Population Inversion 180°S — τ — 90°I (Y), 90°S...

higher than the amount in the normal ground state, the population inversion occurs. The inversion, like the one caused with germanium, makes it possible...

allows the gain medium to have a high population inversion. When the gain medium has the desired population inversion, the Pockels cell is switched "open"...

) then n 3 > n 2 {\displaystyle n_{3}>n_{2}} and a population inversion will exist. The population ratio is defined as n 3 n 2 = τ 32 τ 21 = W 21 W 32...

number of particles in the ground state or a less-excited state, population inversion is achieved. In this condition, the mechanism of stimulated emission...

necessary condition for the generation of a laser radiation is the population inversion, which can be achieved either by exciting atoms and inducing percussion...

Blue gas lasers are large and expensive instruments relying on population inversion in rare gas mixtures which use high currents and large cooling due...

Lasing without inversion (LWI), or lasing without population inversion, is a technique used for light amplification by stimulated emission without the...

ASE is produced when a laser gain medium is pumped to produce a population inversion. Feedback of the ASE by the laser's optical cavity may produce laser...

rely on two physical phenomena to work, stimulated emission and population inversion. An atom is made of a nucleus and a number of electrons orbiting...

medium (producing an optical resonator with low Q). This produces a population inversion, but laser operation cannot yet occur since there is no feedback...