Interaction of laser radiation with matter. Laser plasma

Absorption of resonance laser radiation in ultracold plasma

N. Ya. Shaparev<sup>ab

a</sup> Institute of Computational Modelling, Siberian Branch of the Russian Academy of Sciences, Krasnoyarsk
^b Tomsk State University

Abstract: The absorption of resonance laser radiation in an expanding ultracold plasma is considered. Initially the optical thickness τ₀ of the medium decreases due to correlation heating of the ions; the subsequent lowering of τ₀ is due to the variation of radial ion velocities. The expanding optically thick medium is shown to become transparent when the ratio between the particle expansion velocity at the sphere boundary and the thermal velocity exceeds the optical thickness τ₀.

Keywords: optical transparentisation, resonance laser radiation, expanding ultracold laser-produced plasma.

Received: 16.05.2017
Revised: 29.06.2017

 English version: Quantum Electronics, 2017, 47:8, 718–721

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