Abstract
A microscopic correlation-function expression for the photon-echo signal in systems with long-range spatial correlations is developed. In general, the signal is given by an eight-point correlation function of the dipole operator involving two particles. In the absence of long-range spatial correlations, this correlation function may be factorized into a product of two four-point, single-particle correlation functions. Only under these conditions is the signal proportional to the absolute square of the ensemble-averaged nonlinear polarization. We predict that photon echoes may be used to probe the long-range spatial correlations near critical points.
© 1986 Optical Society of America
Full Article | PDF ArticleMore Like This
J. M. Liang, R. R. Dasari, M. S. Feld, and J. E. Thomas
J. Opt. Soc. Am. B 3(4) 506-513 (1986)
M. Defour, J. C. Keller, and J. L. Le Gouët
J. Opt. Soc. Am. B 3(4) 544-547 (1986)
A. Szabo
J. Opt. Soc. Am. B 3(4) 514-522 (1986)