Counterintuitive Gaussian pulse sequence in three-level ladder scheme |
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Authors: | Koganov G A Shuker R Smolik E Braunstein D |
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Institution: | 1.Physics Department, Ben Gurion University of the Negev, P. O. Box 653, Beer sheva, 84105, Israel ;2.Eilat Campus, Ben Gurion University of the Nege, Hatmarim Blv, Eilat, 88000, Israel ;3.Physics Department, Shammoon College of Engineering, P. O. Box 45, Beer sheva, 84100, Israel ; |
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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 coupling 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. |
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