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|Title:||Vibrational ground state cooling of a neutral atom in a tightly focused optical dipole trap|
|Authors:||Aljunid, S.A. |
|Source:||Aljunid, S.A.,Lee, J.,Paesold, M.,Chng, B.,Maslennikov, G.,Kurtsiefer, C. (2011). Vibrational ground state cooling of a neutral atom in a tightly focused optical dipole trap. 2011 Conference on Lasers and Electro-Optics Europe and 12th European Quantum Electronics Conference, CLEO EUROPE/EQEC 2011 : -. ScholarBank@NUS Repository. https://doi.org/10.1109/CLEOE.2011.5943303|
|Abstract:||It was recently shown that a single atom can efficiently scatter photons out of a focused coherent light beam [1, 2, 3]. The scattering probability is strongly dependent on a thermal motion of the atom and can be maximized if the atom is well localized at a focus. To achieve that, we implement a Raman sideband cooling technique that is commonly used in ion traps . Our trap, formed by focused Gaussian light beam at 980nm, has characteristic frequencies of ντ = 55 kHz and l = 7 kHz corresponding to transverse and longitudinal confinements. A single 87Rb atom is loaded into the trap from an optical molasses. Two Raman beams couple the motional states of F = 2 and F = 1 manifolds with a Lamb-Dicke parameter = 0.084 (Figure 1). The Raman beams are oriented such that momentum transfer occurs only along the strong confinement of the trap with ντ = 55 kHz. The cooling sequence consists of following steps: (1) initial preparation of the atom in F = 2,mF = 2 Zeeman state, (2) Raman transfer between the motional states F = 2,mF = 2,N and F = 1,mF = 1,N 1. (3) recycling the atomic population back to F = 2,mF = 2 state via an optical pulse resonant to 5P3/2, F = 2 state thus removing a phonon via spontaneous emission. © 2011 IEEE.|
|Source Title:||2011 Conference on Lasers and Electro-Optics Europe and 12th European Quantum Electronics Conference, CLEO EUROPE/EQEC 2011|
|Appears in Collections:||Staff Publications|
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