dorsal/arxiv
View SchemaA cesium gas strongly confined in one dimension : sideband cooling and collisional properties
| Authors | I. Bouchoule, M. Morinaga, D. S. Petrov, C. Salomon |
|---|---|
| Categories | |
| ArXiv ID | quant-ph/0106032 |
| URL | https://arxiv.org/abs/quant-ph/0106032 |
| DOI | 10.1103/PhysRevA.65.033402 |
Abstract
We study one-dimensional sideband cooling of Cesium atoms strongly confined in a far-detuned optical lattice. The Lamb-Dicke regime is achieved in the lattice direction whereas the transverse confinement is much weaker. The employed sideband cooling method, first studied by Vuletic et al.\cite{Vule98}, uses Raman transitions between Zeeman levels and produces a spin-polarized sample. We present a detailed study of this cooling method and investigate the role of elastic collisions in the system. We accumulate $83(5)%$ of the atoms in the vibrational ground state of the strongly confined motion, and elastic collisions cool the transverse motion to a temperature of $2.8 \mu $K=$0.7 \hbar\omega_{\rm osc}/k_{\rm B}$, where $\omega_{\rm osc}$ is the oscillation frequency in the strongly confined direction. The sample then approaches the regime of a quasi-2D cold gas. We analyze the limits of this cooling method and propose a dynamical change of the trapping potential as a mean of cooling the atomic sample to still lower temperatures. Measurements of the rate of thermalization between the weakly and strongly confined degrees of freedom are compatible with the zero energy scattering resonance observed previously in weak 3D traps. For the explored temperature range the measurements agree with recent calculations of quasi-2D collisions\cite{Petr01}. Transparent analytical models reproduce the expected behavior for $k_{\rm B}T \gg \hbar \omega_{\rm osc}$ and also for $k_{\rm B}T \ll \hbar \omega_{\rm osc}$ where the 2D features are prominent.
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"abstract": "We study one-dimensional sideband cooling of Cesium atoms strongly confined\nin a far-detuned optical lattice. The Lamb-Dicke regime is achieved in the\nlattice direction whereas the transverse confinement is much weaker. The\nemployed sideband cooling method, first studied by Vuletic et al.\\cite{Vule98},\nuses Raman transitions between Zeeman levels and produces a spin-polarized\nsample. We present a detailed study of this cooling method and investigate the\nrole of elastic collisions in the system. We accumulate $83(5)%$ of the atoms\nin the vibrational ground state of the strongly confined motion, and elastic\ncollisions cool the transverse motion to a temperature of $2.8 \\mu $K=$0.7\n\\hbar\\omega_{\\rm osc}/k_{\\rm B}$, where $\\omega_{\\rm osc}$ is the oscillation\nfrequency in the strongly confined direction. The sample then approaches the\nregime of a quasi-2D cold gas. We analyze the limits of this cooling method and\npropose a dynamical change of the trapping potential as a mean of cooling the\natomic sample to still lower temperatures. Measurements of the rate of\nthermalization between the weakly and strongly confined degrees of freedom are\ncompatible with the zero energy scattering resonance observed previously in\nweak 3D traps. For the explored temperature range the measurements agree with\nrecent calculations of quasi-2D collisions\\cite{Petr01}. Transparent analytical\nmodels reproduce the expected behavior for $k_{\\rm B}T \\gg \\hbar \\omega_{\\rm\nosc}$ and also for $k_{\\rm B}T \\ll \\hbar \\omega_{\\rm osc}$ where the 2D\nfeatures are prominent.",
"arxiv_id": "quant-ph/0106032",
"authors": [
"I. Bouchoule",
"M. Morinaga",
"D. S. Petrov",
"C. Salomon"
],
"categories": [
"quant-ph"
],
"doi": "10.1103/PhysRevA.65.033402",
"title": "A cesium gas strongly confined in one dimension : sideband cooling and collisional properties",
"url": "https://arxiv.org/abs/quant-ph/0106032"
},
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