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Journal of the Optical Society of America B

Journal of the Optical Society of America B

| OPTICAL PHYSICS

  • Vol. 3, Iss. 4 — Apr. 1, 1986
  • pp: 477–482

Saturation-spectroscopy transients from Raman coherence between metastable levels

Ch. Lerminiaux and M. Dumont  »View Author Affiliations


JOSA B, Vol. 3, Issue 4, pp. 477-482 (1986)
http://dx.doi.org/10.1364/JOSAB.3.000477


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Abstract

We present a theoretical and experimental study of the time evolution of the saturation-spectroscopy line shape when the saturating beam is suddenly switched on. We consider two metastable levels coupled by two Doppler-broadened transitions with a common excited level. In this special case, the fast transients from the upper level are rapidly damped, and the slow transients from populations and from Raman coherence in the metastable levels are easy to observe and are used for studying the collisional relaxation. For the sake of clarity, the theoretical analysis is developed according to a perturbation calculation. Nevertheless, saturation of the metastable levels must be taken into account in a more realistic theory (velocity-selective optical pumping): We give only a few results that are in excellent agreement with the experiments performed on neon metastable levels 3P0 and 3P2.

© 1986 Optical Society of America

Citation
Ch. Lerminiaux and M. Dumont, "Saturation-spectroscopy transients from Raman coherence between metastable levels," J. Opt. Soc. Am. B 3, 477-482 (1986)
http://www.opticsinfobase.org/josab/abstract.cfm?URI=josab-3-4-477


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References

  1. For a complete bibliography see Ref. 4.
  2. T. Hänsch, R. Keil, A. Schabert, Ch. Schmelzer, and P. Toschek, "Interaction of laser light waves by dynamic Stark splitting," Z. Phys. 226, 293 (1969).
  3. T. Hänsch and P. Toschek, "Theory of three-level gas laser amplifier," Z. Phys. 236, 213 (1970).
  4. M. Ducloy, J. R. Leite, and M. S. Feld, "Laser saturation spectroscopy in the time-delayed mode. Theory of optical free induction decay in coupled Doppler-broadened systems," Phys. Rev. A 17, 623 (1978).
  5. M. Ducloy and M. S. Feld, "Laser-induced transients in coupled Doppler-broadened systems," J. Phys. (Paris) Lett. 37, L173 (1976). In this paper preliminary results are given on switching on transients, but with simplified relaxation processes.
  6. J. R. Leite, M. Ducloy, A. Sachez, D. Seligon, and M. S. Feld, "Measurement of molecular alignment relaxation rate in NH3 using non-Lorentzian laser-induced saturation resonances," Phys. Rev. Lett. 39, 1465 (1977); "Laser saturation resonance in NH3 observed in the time delayed mode," Phys. Rev. Lett. 39, 1469 (1977).
  7. See, for instance, Ref. 4. Compared with this reference, we have an additional source term from spontaneous emission in equations for σb and σc.
  8. J. R. Leite, R. L. Sheffield, M. Ducloy, R. D. Sharma, and M. S. Feld, "Theory of coherent three-level beats," Phys. Rev. A 14, 1151 (1976).
  9. D. Hennecart, "Etude des transferts collisionnels de population et d'alignment à l'intérieur des configurations 2p5 3s et 2p5 3p du néon," Thèse d'Etat (Université de Caen, Caen, France, 1982), and references therein.
  10. The evolution of the shape of the population signal has been studied with a more convenient three-level system in which the common level a was the metastable state 3P0 and b and c were excited levels. The coherent transient was observed as a broadening of the resonance for short time delays [M. Gorlicki, Thèse d'Etat (Université Paris-Nord, Paris, 1985) (to be published)]. Indeed, time resolution was not good enough to permit the observation of oscillating wings. For long delays, the broadening of the line and the growth of a background (both due to velocity-changing collisions) were studied in great detail: M. Gorlicki, A. Peuriot, and M. Dumont, J. Phys. (Paris) Lett. 41, L275 (1980); M. Dumont, M. Gorlicki, and F. Manzano, Ann. Phys. (Paris) 7, 381 (1982); M. Gorlicki, Ch. Lerminiaux, and M., Dumont, Phys. Rev. Lett. 49, 1394 (1982); M. Dumont, M. Gorlicki, and Ch. Lerminiaux, in Spectral Line Shapes, K. Burnett, ed. (Walter de Gruyter, Berlin, 1983), Vol. 2, p. 881.
  11. γb and γc are mainly due to velocity-changing collisions and metastability-exchange collisions. For the short time delays considered here, this can be seen as a simple relaxation, and the arrival term from this type of collision may be ignored. Nevertheless, this recovery is at the origin of the slow broadening of population signal from the lower level and of a very-long-term slow decrease of the Raman-signal amplitude. See Ref. 10.
  12. H. G. Kuhn and E. L. Lewis, Proc. R. Soc London Ser. A 299, 423 (1967).
  13. M. Dumont, "Velocity selective optical pumping in saturation spectroscopy: transients from populations and coherences," J. Opt. (Paris) (to be published); "Du pompage optique à l'absorption saturée résolue en temps," in Hommage à Alfred Kastler, F. Laloe, ed., Ann. Phys. (Paris) 10 (1985).

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