LASER COOLING OF TRAPPED IONS IN A STANDING WAVE
LASER COOLING OF TRAPPED IONS IN A STANDING WAVE
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DOI：
10.1103/physreva.46.2668
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发表时间：
1992-09-01
影响因子：
2.9
通讯作者：
PHILLIPS, WD
中科院分区：
文献类型：
--
作者：
CIRAC, JI;BLATT, R;PHILLIPS, WD
从理论上讨论了驻波和行波结构中俘获离子的激光冷却问题。假设离子在激光波长提供的尺度上是空间局域的(Lamb-Dicke极限)。导出了多能级系统离子质心分布的主方程，并给出了二能级和三能级系统以及谐波囚禁势的显式结果。对于位于驻波结点的二能级系统，我们得到了比运行波极限低2倍的最终温度和不随激光强度饱和的冷却速率。在驻波最大梯度处，发现了类似于自由原子的西西弗斯冷却的蓝色失谐冷却。对于一个三能级系统，我们将我们的结果与Winland，Dalibard和Cohen-Tannoudji的结果进行了比较。SoC。上午好。B 9、32(1992)]。
Laser cooling of trapped ions in a standing- and running-wave configuration is discussed theoretically. The ions are assumed to be spatially localized on the scale provided by the wavelength of the laser (Lamb-Dicke limit). A master equation for the center-of-mass distribution of the ion is derived for a multilevel system and explicit results are presented for two- and three-level systems and harmonic trapping potentials. For the two-level system located at the node of the standing wave, we find final temperatures that are a factor of 2 lower than the limit for a running wave and cooling rates that do not saturate with the laser intensity. At the point of maximum gradient of the standing wave, blue detuned cooling is found that is analogous to the Sisyphus cooling of free atoms. For a three-level system we compare our results with those of Wineland, Dalibard, and Cohen-Tannoudji [J. Opt. Soc. Am. B 9, 32 (1992)].