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Optics Express

Optics Express

  • Editor: J. H. Eberly
  • Vol. 8, Iss. 4 — Feb. 12, 2001
  • pp: 238–245

Coherent Mechanism of Robust Population Inversion

J. Vala and R. Kosloff  »View Author Affiliations


Optics Express, Vol. 8, Issue 4, pp. 238-245 (2001)
http://dx.doi.org/10.1364/OE.8.000238


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Abstract

A coherent mechanism of robust population inversion in atomic and molecular systems by a chirped field is presented. It is demonstrated that a field of sufficiently high chirp rate imposes a certain relative phase between a ground and excited state wavefunction of a two-level system. The value of the relative phase angle is thus restricted to be negative and close to 0 or -π for positive and negative chirp, respectively. This explains the unidirectionality of the population transfer from the ground to the excited state. In a molecular system composed of a ground and excited potential energy surface the symmetry between the action of a pulse with a large positive and negative chirp is broken. The same framwork of the coherent mechanism can explain the symmetry breaking and the population inversion due to a positive chirped field.

© Optical Society of America

OCIS Codes
(020.1670) Atomic and molecular physics : Coherent optical effects
(030.1670) Coherence and statistical optics : Coherent optical effects

ToC Category:
Research Papers

History
Original Manuscript: December 19, 2000
Published: February 12, 2001

Citation
Jiri Vala and Ronnie Kosloff, "Coherent mechanism of robust population inversion," Opt. Express 8, 238-245 (2001)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-8-4-238


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References

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