Abstract
Experimental results are reported of investigations of the optical properties of the plasma produced when an AI2O3 target is irradiated in vacuum by a high-power neodymiunr-glass laser system. It is shown that a number of 0 VIII and 0 VII ion levels with principal quantum numbers n = 2, 3, 4 are inversely populated. The gain at the wavelength λ ≃ 29 nm (4 → 3 transition, O VIII) under the experimental conditions is of the order of 0.01 cm-1. For the heliumlike ions O VII, in a transition with the same principal quantum numbers (ls4p1P1 → ls3s1S0, λ ≃ 36.9 nm), the gain is of the order of ∼ 10-2–10-1 cm-1, depending on the electron density.
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Literature Cited
F. V. Bunkin, V. I. Derzhiev, and S. I. Yakovlenko, “Prospects of light amplification in the far UV”, Kvantovaya Elektron. (Moscow),8, 1621–1649 (1981).
L. I. Gudzenko and L. A. Shelepin, “Negative absorption in a nonequilibrium hydrogen plasma”, Zh. Eksp. Teor. Fiz.,45, No. 5(11), 1445–1449 (1963).
F. E. Irons and N. J. Peacock, “Experimental evidence for population inversion in C5+ in an expanding laser-produced plasma”, J. Phys.,B7, 1109–1112 (1974).
É. Ya. Kononov and K. N. Koshelev, “Inverted population of multiply charged ion levels”, Kvantovaya Elektron. (Moscow),1, 2411–2416 (1974).
É. Ya. Kononov, K. N. Koshelev, Y. A. Levykin, Yu. V. Sidel'nikov, and S. S. Churilov, “Inverted population of Al XI levels in a laser plasma”, ibid.,3, 576–581 (1976).
V. A. Bhagavatula and B. Yaakobi, “Direct observation of population inversion between Al11+ levels in a laser-produced plasma”, Opt. Commun.,24, 331–335 (1978).
V. A. Boiko, B. A. Bryunetkin, B. N. Duvenov, et al., “Inverted population of helium-like magnesium ions in a recombining laser plasma”, Pis'ma Zh. Tekh. Fiz.,7, No. 11, 665–668 (1981).
T. S. Bristov, M. J. Lubin, N. M. Forsyth, E. B. Goldman, and J. M. Soures, “High-intensity x-ray spectra and stimulated emission from laser plasma”, Opt. Commun.,5, 315–318 (1972).
A. V. Vinogradov, I. I. Sobel'man, and E. A. Yukov, “Possibility of producing a laser for the far ultraviolet on transitions of multiply charged ions in an inhomogeneous plasma”, Kvantovaya Elektron. (Moscow),2, 105–113 (1975).
A. V. Vinogradov, I. Yu. Skobelev, I. I. Sobel'man, and E. A. Yukov, “Inverted medium for the vacuum ultraviolet region of the spectrum”, ibid.,2, 289–2195 (1975).
V. A. Bhagavatula, “Soft x-ray population inversion by resonant photoexcitation in multicomponent laser plasma”, J. Appl. Phys.,47, 4535 (1976).
V. G. Movshev, A. N. Ryabtsev, and N. K. Sukhodrev, “Measurement of the sensitivity of the photographic films UF-2T, UF-R, and Sc-5 in the spectral region 1.5–23.6 Å”, Zh. Prikl. Spektrosk.,12, No. 2, 274–279 (1970).
E. V. Aglitskii, V. A. Boiko, T. A. Kalinkina, A. N. Oshurkova, S. A. Pikuz, V. N. Uvarova, A. Ya. Faenov, and N. R. Shpol'skii, “Sensitometric characteristics of the films UF-R, UF-V4, and UF-VR used to record soft x rays (λ=2–10 Å)” Prib. Tekh. Eksp., No. 4, 207–209 (1975).
R. J. Liefeld, S. Hanzenly, T. B. Kirby, and D. Mott, Advances in X-Ray Analysis, Vol. 13, Plenum Press, New York (1970), pp. 373–381.
B. L. Henke, R. White, and B. Lundberg, “Semiempirical determination of mass absorption coefficients for the 5 to 50 Å x-ray region”, J. Appl. Phys.,28, 98–105 (1957).
V. I. Bayanov, S. S. Gulidov, A. A. Mak, G. V. Peregudov, I. I. Sobel'man, A. D. Sarikov, and V. A. Chirkov, “Investigation of the spatial distribution of laser-plasma parameters at a heating-pulse duration 10−10 sec by x-ray spectroscopy methods”, Kvantovaya Elektron. (Moscow),3, No. 10, 2253–2265 (1976).
R. W. P. McWhirter and A. G. Hearn, “A calculation of the instantaneous population densities of the excited levels of hydrogenlike ions in plasma”, Proc. Phys. Soc.,82, 641–654 (1963).
L. A. Vainshtein, I. I. Sobel'man, and E. A. Yukov, Excitation of Atoms and Broadening of Spectral Lines [in Russian], Nauka (1979).
T. F. Stratton, Plasma Diagnostics, Academic Press (1965).
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Translated from Lazernye Sistemy, pp. 5–14 1982.
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Korukhov, V.V., Nikulin, N.G. & Troshin, B.I. Experimental investigation of population inversion of oxygen K-ion levels. J Russ Laser Res 7, 327–332 (1986). https://doi.org/10.1007/BF01120144
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DOI: https://doi.org/10.1007/BF01120144