Pump and amplification dynamics of gamma rays in a nuclear medium with the hidden population inversion

The features of the pump dynamics of isomeric nuclei excited by X-rays of a repetitively pulsed relativistic electron beam followed by the production of a medium with the negative absorption of gamma quanta are analysed. In the extended nuclear medium, the pump excites a travelling hidden-population...

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Bibliographic Details
Published in:Quantum electronics (Woodbury, N.Y.) N.Y.), 2009-12, Vol.39 (12), p.1125-1130
Main Author: Rivlin, Lev A
Format: Article
Language:English
Subjects:
ABSORPTION
AMPLIFICATION
ANISOTROPY
BEAMS
CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
CRYSTALS
ELECTROMAGNETIC RADIATION
ELECTRON BEAMS
ELECTRONIC EQUIPMENT
ENERGY RANGE
ENERGY-LEVEL TRANSITIONS
EXCITATION
GAMMA RADIATION
IONIZING RADIATIONS
ISOMERIC NUCLEI
LEPTON BEAMS
MIRRORS
MONOCRYSTALS
NUCLEAR PHYSICS AND RADIATION PHYSICS
NUCLEI
PARTICLE BEAMS
POPULATION INVERSION
POWER DENSITY
PUMPING
RADIATION SOURCES
RADIATIONS
RELATIVISTIC RANGE
RESONATORS
SORPTION
X RADIATION
X-RAY SOURCES
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Summary:The features of the pump dynamics of isomeric nuclei excited by X-rays of a repetitively pulsed relativistic electron beam followed by the production of a medium with the negative absorption of gamma quanta are analysed. In the extended nuclear medium, the pump excites a travelling hidden-population-inversion wave with the anisotropic gamma amplification, which becomes positive in the case of the excess over the critical pump parameter equal to the product of the peak spectral power density of the X-ray source and the relative duration of an ultrashort relativistic electron bunch. In the alternative scheme with orthogonal directions of pumping X-rays and a flux of amplified gamma quanta, the absence of the amplification anisotropy opens up the possibility for constructing a standard two-mirror resonator with Bragg single-crystal reflectors. The critical peak value of the spectral pump power density is compared with the known characteristics of relativistic-electron X-ray sources by examples of some nuclides. (active media)
ISSN:1063-7818
1468-4799
DOI:10.1070/QE2009v039n12ABEH014041