Abstract
At light intensities exceeding I* = 1014W/cm2 (for ruby and neodymium glass lasers), nonlinear effects start to become efficient. One of these effects at plasma densities close to the cut-off-case is the creation of a force, directed towards lower plasma density which exceeds the thermokinetic forces. An elementary description of the force is given showing a drift of the oscillating electrons where only the nonlinear longitudinal oscillation has to be included. The general derivation of the force is given by the equation of motion of the Lorentz theory for nonrelativistic plasma with or without collisions at oblique incidence of the radiation and at total reflection. The transferred momentum can be expressed by a nonlinearly increased radiation pressure, and the resulting ion energy of translatory motion is equal to the increased oscillation energy of the electrons in the plasma. The evaluation of the threshold I* for the nonlinear effect is based on a nonlinear intensity dependence of the inverse bremstrahlung. A self-focusing mechanism in plasma has a threshold at laser powers of only 1 MW. It results in light filaments with electromagnetic energy densities exceeding the thermokinetic values (I> I*) which can explain measured filament diameters in gas breakdown and nonlinear effects in the usual cases of laser produced plasma. It cannot be excluded that the high energy, nonthermal ions at laser produced plasmas (Linlor effect) are due to the described nonlinear acceleration after self-focusing occurred.
Presented at the Workshop on “Laser Interaction and Related Plasma Phenomena”, Rensselaer Polytechnic Institute, Hartford Graduate Center, June 9–13, 1969.
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Hora, H. (1971). Nonlinear Effect of Expansion of Laser Produced Plasmas. In: Schwarz, H.J., Hora, H. (eds) Laser Interaction and Related Plasma Phenomena. Springer, Boston, MA. https://doi.org/10.1007/978-1-4684-0901-7_18
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