Journal of the Optical Society of Korea

Optical Society of Korea (한국광학회)
권호 표지
DOI QR코드

DOI QR Code

Study of The Anisotropy of Electron Energy Distribution of Optical-Field Ionized Oxygen Plasma by Using Polarization Spectroscopy

  • Kim, Dong-Eon (Department of Physics, Pohang University of Science and Technology) ;
  • Kim, Jae-Hoon (Department of Physics, Pohang University of Science and Technology) ;
  • Kawachi, Tetsuya (Advanced Photon Research Center, Japan Atomic Energy Research Institute) ;
  • Hasegawa, Noboru (Advanced Photon Research Center, Japan Atomic Energy Research Institute) ;
  • Sukegawa, Kouta (Advanced Photon Research Center, Japan Atomic Energy Research Institute) ;
  • Iwamae, Atsushi (Department of Engineering, Faculty of Engineering, Kyoto University,) ;
  • Fujimoto, Takashi (Department of Engineering, Faculty of Engineering, Kyoto University,)
  • Received : 2003.06.26
  • Published : 2003.09.01
Download PDF
⟨ Previous Next ⟩

Abstract

The anisotropy of electron energy distribution in oxygen plasmas produced by a high intensity laser was investigated by using polarization spectroscopy. An ultra-short pulsed laser with a pulse duration of 66.5 fs and a power density of $1 {\times} 10^17/ W/$\textrm{cm}^2$$ was used. At this power density and pulse duration, the plasma was generated predominantly by optical field ionization. The degree of polarization of OVI 1s$^2$2p$^2$p2- 1s$^2$4d$^2$D$^{0}$ (J = 1/2-3/2 and 3/2-5/2) transition line at 129.92 $\AA$ was measured. O VI 1s$^2$2p$^2$P$^2$ -1s$^2$4s$^2$S$^2$ (J = 1/2-1/2 and 3/2-1/2) transition line at 132.26 $\AA$ was used to calibrate the sensitivity of the optical system. The dependencies of the degree of polarization on the initial gas density and on the laser polarization were investigated. When the laser polarization was changed from a linear to a circular polarization, the degree of polarization was decreased. When the initial gas density was increased, the degree of polarization was decreased.

Keywords

References

  1. P. Gibbon and E. F¨oster, “Short-pulse laser-plasma interaction,” Plamsa Phys. Control. Fusion, vol. 38, pp. 769-793, 1996. https://doi.org/10.1088/0741-3335/38/6/001
  2. P. B. Corkum, N. H. Burnett, and F. Brunel, “Abovethreshold ionization in the long-wavelength limit,” Phys. Rev. Lett., vol. 62, no. 11, pp. 1259-1262, 1989. https://doi.org/10.1103/PhysRevLett.62.1259
  3. S. Hulin, T. Auguste, P. D Oliveira, P. Monot, S. Jacquemot, L. Bonnet, and E. Lefebvre, “Soft-x-ray laser scheme in a plasma created by optical-fieldinduced ionization of nitrogen,” Phys. Rev. E, vol. 61, no. 5, pp. 5693-5700, 2000. https://doi.org/10.1103/PhysRevE.61.5693
  4. A. Egbert, D. M. Simanovskii, B. N. Chichkov, and B. Wellegehausen, “Optically field-ionized He plasmas,” Phys. Rev. E, vol. 57, no. 6, pp.7138-7145, 1998. https://doi.org/10.1103/PhysRevE.57.7138
  5. N. B. Delone and V. P. Krainov, “Energy and angular electron spectra for the tunnel ionization of atoms by strong low-frequency radiation,” J. Opt. Soc. Am. B vol. 8, no. 6, p. 1207, 1991. https://doi.org/10.1364/JOSAB.8.001207
  6. T. E. Glover, J. K. Crane, M. D. Perry, R. W. Lee, and R. W. Falcone, “Measurement of velocity distributions and recombination kinetics in tunnel-ionized Helium plasmas,” Phy. Rev. Lett., vol. 75, no. 3, pp. 445-448, 1995. https://doi.org/10.1103/PhysRevLett.75.445
  7. T. Fujimoto and S. A. Kazantsev, “Plasma polarization spectroscopy,” Plamsa Phys. Control. Fusion, vol. 39, pp. 1267-1294, 1997. https://doi.org/10.1088/0741-3335/39/9/002
  8. J. C. Kieffer, et al, “Electron distribution anisotropy in laser-produced plasmas from X-ray line polarization measurements,” Phy. Rev. Lett., vol. 68, no. 4, p p. 480-483, 1992. https://doi.org/10.1103/PhysRevLett.68.480
  9. B. N. Chichkov, A. Egbert, H. Eichmann, C. Momma, and S. Nolte, “Soft-x-ray lasing to the ground states in low-charged oxygen ions,” Phys. Rev. A, vol. 52, no. 2, pp. 1629-1639, 1995. https://doi.org/10.1103/PhysRevA.52.1629
  10. F. F. Chen, Introduction to plasma physics and controlled fusion, 2nd Edition, Plenum Press, NewYork, 1984.