nuclear-pumped lasing
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Nuclear pumped laser — A nuclear pumped laser is a laser pumped with the energy of fission fragments. The lasing medium is enclosed in a tube lined with uranium 235 and subjected to high neutron flux in a nuclear reactor core. The fission fragments of the uranium… … Wikipedia
Laser pumping — is the act of energy transfer from an external source into the gain medium of a laser. The energy is absorbed in the medium, producing excited states in its atoms. When the number of particles in one excited state exceeds the number of particles… … Wikipedia
Strategic Defense Initiative — Organization SDIO Agency overview Formed 1984 Dissolved 1993 (renamed) Superseding a … Wikipedia
ЛАЗЕР С ЯДЕРНОЙ НАКАЧКОЙ — (ЛЯН) лазер, в к ром усиливающая свет среда возбуждается непосредственно продуктами ядерных реакций. Обычно основа ЛЯН трубка с газом, помещённая в поток тепловых нейтронов (рис.). Нейтроны стимулируют реакции в ядерно активном веществе, к рое… … Физическая энциклопедия
Laser — For other uses, see Laser (disambiguation). United States Air Force laser experiment … Wikipedia
Xenon — (PronEng|ˈzɛnɒn [Xenon, entry in the Oxford English Dictionary, prepared by J. A. Simpson and E. S. C. Weiner, vol. 20, second edition, Oxford: Clarendon Press, 1989. ISBN 0 19 861232 X (vol. 20), ISBN 0 19 861186 2 (set.)] or IPAlink en|ˈziːnɒn… … Wikipedia
Physical Sciences — ▪ 2009 Introduction Scientists discovered a new family of superconducting materials and obtained unique images of individual hydrogen atoms and of a multiple exoplanet system. Europe completed the Large Hadron Collider, and China and India took… … Universalium
Mathematics and Physical Sciences — ▪ 2003 Introduction Mathematics Mathematics in 2002 was marked by two discoveries in number theory. The first may have practical implications; the second satisfied a 150 year old curiosity. Computer scientist Manindra Agrawal of the… … Universalium
Astrophysical maser — An astrophysical maser is a naturally occurring source of stimulated spectral line emission, typically in the microwave portion of the electromagnetic spectrum. This emission may arise in molecular clouds, comets, planetary atmospheres, stellar… … Wikipedia
Active laser medium — The active laser medium or gain medium is the source of optical gain within a laser. The gain results from the stimulated emission of electronic or molecular transitions to a lower energy state from a higher energy statepreviously populated by a… … Wikipedia
Population inversion — In physics, specifically statistical mechanics, a population inversion occurs when a system (such as a group of atoms or molecules) exists in state with more members in an excited state than in lower energy states. The concept is of fundamental… … Wikipedia
