This article is cited in 5 papers

Interaction between radiation and matter. Laser plasma

Thermal oscillations of radiation harmonics generated by a laser plasma

V. F. Kovalev, V. V. Pustovalov


Abstract: It is shown that there is a set of oscillations with 0.5n(n + 1) periods against the background of a dependence of the efficiency of conversion of laser radiation into n≥2 harmonics that decays monotonically with increasing laser plasma temperature. The electron rest energy reduced by a factor (L / λ) >> 1 (L is the characteristic inhomogeneity scale of the plasma density, λ is the wavelength of the laser radiation) serves as the characteristic scale of the periods, which are an algebraic function of the harmonic number. In a hot laser plasma (T> 1 keV) with an inhomogeneity scale L = 50 μm exposed to the action of neodymium laser radiation, the flux density of the third harmonic oscillates with a period of the order of 0.5 keV.

UDC: 621.323.826:533.9

PACS: 52.50.Jm, 52.35.Fp, 52.25.Kn, 52.38.-r, 42.60.Lh

Received: 03.08.1988

 English version: Soviet Journal of Quantum Electronics, 1989, 19:11, 1454–1457

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