Numerical investigation of the propagation of a pulse of radiation with λ=10.6 μm through absorbing media

  • V. A. Levin
  • V. V. Netesov
  • A. M. Starik


The passage of electromagnetic radiation through gaseous media is of special interest when reasonantly absorbing impurities are present in the gas. The interaction of radiation with such a medium can lead, for example, to a temporal decrease of the gas temperature or to its strong heating [1-3]. At the same time the index of refraction in the channel of the light beam is altered, which leads to a deviation of the light rays from the initial direction. The main characteristics of such thermal selfaction within the framework of linear absorption theory for steady and nonsteady processes have been discussed in [4-12]. Nonequilibrium processes in the medium upon absorption of resonant radiation were not taken into account. The effect of the kinetics of vibrational energy exchange on the state of a medium upon the propagation of radiation through a mixture of CO2 and N2 gases was first considered in [2, 13, 14]. However, the simplest models of vibrational energy exchange were used, and saturation of the absorbing transition P20 [10°0 → 00°1] in the CO2 molecule was not taken into account. Thus linearized equations of vibrational kinetics were used in [13], and only one channel of relaxation of asymmetric vibrations of CO2 and excited nitrogen was considered in [14]. The propagation of a pulse of radiation with λ=10.6 μm through an absorbing medium is investigated and the influence of the saturation effect and nonlinear processes of vibrational energy exchange on the self-action of light beams of Gaussian profile is studied in this paper.


Refraction Light Beam Electromagnetic Radiation Gaseous Medium Linear Absorption 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

Literature cited

  1. 1.
    F. G. Gebhardt and D. C. Smith, “Kinetic cooling of a gas by absorption of CO2 laser radiation,” Appl. Phys. Lett.,20, 129 (1972).Google Scholar
  2. 2.
    A. D. Wood, M. Camac, and F. T. Gerry, “Effects of 10.6 μm laser-induced air chemistry on the atmospheric refractive index,” Appl. Opt.,10, 1877 (1971).Google Scholar
  3. 3.
    B. F. Gordiets, A. I. Osipov, and R. V. Khokhlov, “Cooling of a gas upon the passage of powerful radiation of a CO2 laser through the atmosphere,” Zh. Tekh. Fiz.,44, 1063 (1974).Google Scholar
  4. 4.
    G. A. Askar'yan, “The self-focusing effect,” Usp. Fiz. Nauk.111, 243 (1973).Google Scholar
  5. 5.
    A. P. Sukhorukov, “Thermal self-focusing of light beams,” in: Nonlinear Processes in Optics [in Russian], Nauka, Novosibirsk (1970).Google Scholar
  6. 6.
    V. P. Lugovoi and A. M. Prokhorov, “Theory of the propagation of powerful laser radiation in a nonlinear medium,” Usp. Fiz. Nauk,111, 203 (1973).Google Scholar
  7. 7.
    F. G. Gebhardt, “High-power laser propagation,” Appl. Opt.,15, 1479 (1976).Google Scholar
  8. 8.
    J. A. Fleck, J. R. Morris, and M. D. Feit, “Time-dependent propagation of high-energy laser beams through the atmosphere,” Appl. Phys.,10, 129 (1976).Google Scholar
  9. 9.
    A. F. Mastryukov and V. S. Synakh, “Nonsteady thermal self-focusing of pulses,” Zh. Prikl. Mekh. Tekh. Fiz., No. 2 (1978).Google Scholar
  10. 10.
    J. W. Strohbehn (ed.), The Propagation of a Laser Beam in the Atmosphere, Springer, Berlin (1978).Google Scholar
  11. 11.
    A. A. Vedenov and O. A. Markin, “The propagation of powerful laser radiation in a medium with absorption,” Zh. Eksp. Teor. Fiz.,76, 1198 (1979).Google Scholar
  12. 12.
    V. D. Gora, Yu. N. Karamzin, and A. P. Sukhorukov, “Self-action of light beams in connection with resonant absorption,” Kvantovaya Elektron.,7, 720 (1980).Google Scholar
  13. 13.
    V. A. Vysloukh and L. I. Ognev, “Resonant self-focusing in a mixture of CO2 and N2,” Zh. Prikl. Mekh. Tekh. Fiz., No. 4 (1980).Google Scholar
  14. 14.
    K. D. Egorov, V. P. Kandidov, and L. I. Ognev, “Self-action of a light beam under conditions of kinetic cooling,” Kvantovaya Elektron.,8, 1012 (1981).Google Scholar
  15. 15.
    A. S. Biryukov, “The kinetics of physical processes in gas dynamic lasers,” Tr. Fiz. Inst. Akad. Nauk SSSR (im. P. N. Lebedeva),83, 13 (1975).Google Scholar
  16. 16.
    S. A. Losev, Gas Dynamic Lasers [in Russian], Nauka, Moscow (1977).Google Scholar
  17. 17.
    K. Smith and R. Thomson, Numerical Simulation of Gas Lasers [Russian translation], Mir, Moscow (1981).Google Scholar
  18. 18.
    K. F. Herzfeld, “Deactivation of vibrations by collisions in. the presence of Fermi resonance, “ J. Chem. Phys.,47, 743 (1967).Google Scholar
  19. 19.
    A. A. Samarskii, Theory of Difference Schemes [in Russian], Nauka, Moscow (1977).Google Scholar

Copyright information

© Plenum Publishing Corporation 1984

Authors and Affiliations

  • V. A. Levin
    • 1
  • V. V. Netesov
    • 1
  • A. M. Starik
    • 1
  1. 1.Moscow

Personalised recommendations