Optical gratings in the collective interaction between radiation and atoms, including recoil and collisions

Year: 2002

Authors: Perrin M., Lippi GL., Politi A.

Autors Affiliation: Institut Non Lineaire Nice, UMR 6618 CNRS, Univ. Nice-Sophia Antipolis, 1361 Route des Lucioles F-06560, Valbonne, France;
Istituto Nazionale di Ottica Appliocata, Largo E. Fermi 6, 50125 Firenze, Italy

Abstract: The introduction of collisions and of a thermal distribution for the atomic momentum in the model for the Collective Atomic Recoil Laser (CARL) is at the origin of important modifications in the interpretation of the mechanisms that give rise to the amplification of the backreflected wave. It is shown that the atomic density grating, considered to be the cause of gain in CARL, disappears in the presence of collisions, while other gratings-in population and polarization phase-survive. While the population grating appears to be merely a consequence of the collective interaction, the latter is the likely cause for the instability,. Finally, simulations show that models that make use of an exponential relaxation mechanism for the atomic momentum, rather than accounting for collisions explicitly, largely overestimate the strength of the interaction.

Journal/Review: JOURNAL OF MODERN OPTICS

Volume: 49 (3-4)      Pages from: 419  to: 429

KeyWords: INDUCED RESONANCES; 2-LEVEL ATOMS; AMPLIFICATION
DOI: 10.1080/09500340110087651

Citations: 8
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