Pellegrino J, Bourgain R, Jennewein S, Sortais Y R P, Browaeys A, Jenkins S D, Ruostekoski J
Laboratoire Charles Fabry, Institut d'Optique, CNRS, Université Paris Sud, 2 Avenue Augustin Fresnel, 91127 Palaiseau cedex, France.
Mathematical Sciences, University of Southampton, Southampton SO17 1BJ, United Kingdom.
Phys Rev Lett. 2014 Sep 26;113(13):133602. doi: 10.1103/PhysRevLett.113.133602.
We study the emergence of collective scattering in the presence of dipole-dipole interactions when we illuminate a cold cloud of rubidium atoms with a near-resonant and weak intensity laser. The size of the atomic sample is comparable to the wavelength of light. When we gradually increase the number of atoms from 1 to ~450, we observe a broadening of the line, a small redshift and, consistently with these, a strong suppression of the scattered light with respect to the noninteracting atom case. We compare our data to numerical simulations of the optical response, which include the internal level structure of the atoms.
当我们用近共振且弱强度的激光照射铷原子冷云时，我们研究了在偶极 - 偶极相互作用存在下集体散射的出现情况。原子样本的尺寸与光的波长相当。当我们将原子数量从1逐渐增加到约450时，我们观察到谱线变宽、出现小的红移，并且与这些现象一致的是，相对于非相互作用原子的情况，散射光受到强烈抑制。我们将我们的数据与光学响应的数值模拟进行比较，该模拟包括原子的内部能级结构。
