Abstract
Radiative losses of plasma produced by ultrashort laser pulses near the surface of solid targets were studied by the methods of high‐resolution x‐ray spectroscopy and using the numerical simulation of gas‐dynamics and radiation processes. The experiments were carried out at the “NEODIM” laser facility in the Central Research Institute for Machine Building. The flux density was as high as 1017 W/cm2 when the radiation was focussed onto the surface of solid targets from Al and Cu. The time‐integrated discrete spectra of plasma of the multiply charged ions were recorded in the soft x‐ray band from 0.8 to 3.0 keV. The experimental spectra were compared with the results of numerical calculations within the framework of the model, which considered both hydrodynamic and radiation‐collisional processes. The association of the radiation dynamics of the individual groups of lines with the spatial and temporal dynamics of the laser torch was revealed. Such an association permits one to judge the nonstationary processes in the expanding plasma even by the spectra integrated over time. From comparison of the experimental results and model calculations, it follows that the line emission of a relatively narrow (in the charge number) group of ions constitutes the major portion of radiation losses.
Article PDF
Similar content being viewed by others
Avoid common mistakes on your manuscript.
References
V. S. Belyaev, V. I. Vinogradov, A. S. Kurilov, et. al., Kvantovaya Électron., 30, 229 (2000).
I. Yu. Skobelev, A. Ya. Faenov, B. A. Bryunetkin, et. al., Zh. Éksp. Teor. Fiz., 56, 1234 (1995).
N. N. Demchenko and V. B. Rozanov, J. Russ. Laser Res., 22, 228 (2001).
G. A. Vergunova and V. B. Rozanov, Laser and Particle Beams, 17, 579 (1999).
G. A. Vergunova, E. M. Ivanov, and V. B. Rozanov, “Collisional-radiation model for calculation of the ionization composition and level populations of nonequilibrium plasma (Al, Ar, Au)” [in Russian], Preprint of the Lebedev Physical Institute, No. 12, Moscow (1998).
G. A. Vergunova, E. M. Ivanov, and V. B. Rozanov, “Calculation of the optical behavior of the aluminum and copper nonequilibrium plasma” [in Russian], Preprint of the Lebedev Physical Institute, No. 74, Moscow (1999).
Ya. B. Zel'dovich and Yu. P. Raiser, Physics of Shock Waves and High-Temperature Hydrodynamic Phenomena, Academic, New York (1966, 1967), Vols. 1 and 2.
A. F. Nikiforov, V. G. Novikov, and V. B. Uvarov, Quantum-Statistical Models of High-Temperature Plasma and Computing Methods for Rosseland Lengths and Equations of State [in Russian], Fizmatlit, Moscow (2000).
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Bryunetkin, B.A., Belyaev, V.S., Demchenko, N.N. et al. Radiative Losses of Plasma on Interaction of Ultrashort Laser Pulses with Matter. Journal of Russian Laser Research 22, 383–402 (2001). https://doi.org/10.1023/A:1012848903250
Issue Date:
DOI: https://doi.org/10.1023/A:1012848903250