Counterintuitive Gaussian Pulse Sequence
in Three-Level Ladder Scheme¹

G. A. Koganov^{a, b}, R. Shuker^a, E. Smolik^c, and D. Braunstein^c, *

^a Physics Department, Ben Gurion University of the Negev, P. O. Box 653, Beer sheva, 84105, Israel

^bEilat Campus, Ben Gurion University of the Negev, Hatmarim Blv, Eilat 88000, Israel

^c Physics Department, Shammoon College of Engineering, P. O. Box 45, Beer sheva, 84100 Israel

*e-mail: doronb@sce.ac.il

Received November 19, 2011; in final form, November 27, 2011; published online April 3, 2012

Abstract—In a recent publication we have studied counterintuitive pulse sequence applied to a three level ladder
scheme, utilizing rectangular-shaped pulses. In this research we investigate amplification without population
inversion in a three level ladder system interacting with two electromagnetic fields, namely, the probe and cou-
pling fields. We take both probe and drive fields in the form of Gaussian shaped pulses. In a counterintuitive
sequence scheme, the short probe pulse is introduced prior to the application of the coupling field, in contrast to
a regular sequence scheme, where both fields are introduced at the same time. The influence of varying the probe
pulse width and time delay between the initiation times of the probe and coupling fields on transient probe gain
is investigated. It is found that the system exhibits a kind of memory about previously applied weak probe pulse.
This may allow for detection of the past event by applying a strong drive pulse in the future.

DOI: 10.1134/S1054660X12050131

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