Superradiant self-diffraction
| Autor: | A. I. Lvovsky, S. R. Hartmann |
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| Rok vydání: | 1999 |
| Předmět: | |
| Zdroj: | Physical Review A. 59:4052-4057 |
| ISSN: | 1094-1622 1050-2947 |
| Popis: | We calculate the far-field intensity pattern of superradiant emission from an optically thin ensemble of atomic oscillators excited by a spatially nonuniform laser pulse of large Rabi area. As the excitation intensity is increased, the superradiant field develops ring structure and expands due to self-diffraction. This effect is made manifest by a two-pulse photon echo experiment where the second pulse is spatially much broader than the first and has a small Rabi area. As a function of the intensity of the first excitation pulse, we measure the on-axis and off-axis echo intensity and find, in agreement with our calculations, that the two behave differently. We also show that for a random, sufficiently smooth excitation profile, the total power of cooperative emission is proportional to the integral, over the excited volume, of the induced dipole moment squared. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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