Modification of radiation pressure due to cooperative scattering of light
Modification of radiation pressure due to cooperative scattering of light
复制标题
由于光的协同散射而改变辐射压
DOI：
10.1140/epjd/e2010-00095-6
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发表时间：
2009
期刊：
影响因子：
--
通讯作者：
N. Piovella
中科院分区：
文献类型：
--
作者：
P. Courteille;S. Bux;E. Lucioni;K. Lauber;T. Bienaimé;R. Kaiser;N. Piovella
从N个原子云的单个光子的合作自发辐射实质上改变了由远失谐激光束激发原子所施加的辐射压力。一方面，由光子吸收引起的力依赖于激发态原子的集体衰变率。另一方面，定向自发辐射抵消了由吸收引起的反冲。我们推导了稳态辐射压的解析表达式。对于平滑的扩展原子分布，我们表明辐射压力通过协同散射取决于原子数，并且对于某些原子数，它可以被抑制或增强。在准共振光的存在下，扩展原子云对光的合作散射可以变得重要，并且可以在许多冷原子实验中解决。
Cooperative spontaneous emission of a single photon from a cloud of N atoms modifies substantially the radiation pressure exerted by a far-detuned laser beam exciting the atoms. On one hand, the force induced by photon absorption depends on the collective decay rate of the excited atomic state. On the other hand, directional spontaneous emission counteracts the recoil induced by the absorption. We derive an analytical expression for the radiation pressure in steady-state. For a smooth extended atomic distribution we show that the radiation pressure depends on the atom number via cooperative scattering and that, for certain atom numbers, it can be suppressed or enhanced. Cooperative scattering of light by extended atomic clouds can become important in the presence of quasi-resonant light and could be addressed in many cold atoms experiments.