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AMPLIFICATION IN RECOMBINING PLASMAS (PLASMA LASERS)
by Gudzenko, L.I., Shelepin,L.A., Yakovlenko,S.I.:
P.N. Lebedev Physics Institute, USSR Academy of Sciences, I.V. Kurchatov
Institute of Atomic Energy
1975, Sov.Phys.Usp., 17, 848.
Abstract: A review is given of the investigations of lasers in which the amplifying
medium is a rapidly recombining (supercooled in respect to free electrons)
dense plasma. Efficient amplification of visible and ultraviolet radiation
is possible in a plasma with free-electron density Ne = 10^13 - 10^18 cm^-3
and an electron temperature Te = 0.05 - 2 eV. At short wavelengths and high
energies, the plasma lasers have important advantages over the conventional
gas lasers in which the active medium is a gas-discharge overheated plasma
which is being ionized. The purpose of the review is to identify the
developing trends in the investigations of plasma lasers. An analysis is
made of the recombination mechanisms of population inversion of atomic,
ionic and molecular levels, of the methods of producing a supercooled
plasma, and of the characteristics of different variants of plasma lasers.
The general theoretical ideas are illustrated by numerical calculations
and experimental results.
- Introduction.
- Recombination mechanisms of population inversion
of atomic and ionic levels.
- Relaxation of population.
- Population inversion in a plasma of simple chemical composition.
- Methods of generation of supercooled plasmas.
- Pulsed plasma lasers.
- Quasicontinuous systems.
- Conclusions.
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