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Journal of the Optical Society of America B

Journal of the Optical Society of America B

| OPTICAL PHYSICS

  • Editor: Henry M. Van Driel
  • Vol. 25, Iss. 5 — May. 1, 2008
  • pp: 865–876

Enhancement of the simultaneous absorption of two photons for pulsed laser–molecule interactions

William J. Meath  »View Author Affiliations


JOSA B, Vol. 25, Issue 5, pp. 865-876 (2008)
http://dx.doi.org/10.1364/JOSAB.25.000865


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Abstract

The dependence of the population of the target state, and the excitation cross section and rate, on pulse duration Q, laser intensity I, and a molecular matrix element A is discussed for two-photon molecular excitation. Perturbative and rotating wave approximation (RWA) expressions for the observables are obtained; the latter are used to discuss the validity of the former. For example, the perturbative cross section and rate increasingly underestimate the RWA results as I increases for given A and Q. Two- and ten-level model dipolar molecules are employed for illustrative purposes. The results are relevant for understanding two-photon excitation processes and their enhancement and include discussions of the roles the permanent dipole- and virtual-state mechanisms in such processes and of the validity of using intensity-independent cross sections to gauge the strength of such excitations.

© 2008 Optical Society of America

OCIS Codes
(190.0190) Nonlinear optics : Nonlinear optics
(190.4180) Nonlinear optics : Multiphoton processes
(190.4710) Nonlinear optics : Optical nonlinearities in organic materials

ToC Category:
Nonlinear Optics

History
Original Manuscript: December 11, 2007
Revised Manuscript: February 25, 2008
Manuscript Accepted: February 25, 2008
Published: April 30, 2008

Citation
William J. Meath, "Enhancement of the simultaneous absorption of two photons for pulsed laser-molecule interactions," J. Opt. Soc. Am. B 25, 865-876 (2008)
http://www.opticsinfobase.org/josab/abstract.cfm?URI=josab-25-5-865

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