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Atoms 2015, 3(4), 495-508;

Two-Photon Collective Atomic Recoil Lasing

Department of Physics & SUPA, University of Strathclyde, John Anderson Building, 107 Rottenrow, Glasgow G4 0NG, UK
These authors contributed equally to this work.
Author to whom correspondence should be addressed.
Academic Editors: Jonathan Goldwin and Duncan O’Dell
Received: 4 September 2015 / Accepted: 30 October 2015 / Published: 20 November 2015
(This article belongs to the Special Issue Cavity Quantum Electrodynamics with Ultracold Atoms)
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We present a theoretical study of the interaction between light and a cold gasof three-level, ladder configuration atoms close to two-photon resonance. In particular, weinvestigate the existence of collective atomic recoil lasing (CARL) instabilities in differentregimes of internal atomic excitation and compare to previous studies of the CARL instabilityinvolving two-level atoms. In the case of two-level atoms, the CARL instability is quenchedat high pump rates with significant atomic excitation by saturation of the (one-photon)coherence, which produces the optical forces responsible for the instability and rapid heatingdue to high spontaneous emission rates. We show that in the two-photon CARL schemestudied here involving three-level atoms, CARL instabilities can survive at high pump rateswhen the atoms have significant excitation, due to the contributions to the optical forces frommultiple coherences and the reduction of spontaneous emission due to transitions betweenthe populated states being dipole forbidden. This two-photon CARL scheme may form thebasis of methods to increase the effective nonlinear optical response of cold atomic gases. View Full-Text
Keywords: collective atomic recoil; instabilities; two-photon collective atomic recoil; instabilities; two-photon

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McKelvie, J.A.; Robb, G.R. Two-Photon Collective Atomic Recoil Lasing. Atoms 2015, 3, 495-508.

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