Abstract
It is established that purely collisional mechanisms are insufficient and recourse to multiphoton ionization (MPI) mechanism is necessary, to explain the initial stage of laser plasma generation in a gas target. Based on simple assumptions, a numerical estimate from below is obtained for the MPI rate, which shows that this process is highly effective in the case of short-wavelength laser radiation of moderate intensity. It is suggested to use a combination of short-and long-wavelength lasers for increasing the efficiency of laser plasma as a source of extreme UV emission.
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Original Russian Text © S.G. Kalmykov, 2008, published in Pis’ma v Zhurnal Tekhnicheskoĭ Fiziki, 2008, Vol. 34, No. 17, pp. 65–71.
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Kalmykov, S.G. The role of multiphoton ionization in the generation and heating of laser plasma. Tech. Phys. Lett. 34, 757–759 (2008). https://doi.org/10.1134/S1063785008090113
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DOI: https://doi.org/10.1134/S1063785008090113