Effective trapping of cold atoms using dipole and radiative forces in an optical trap
Effective trapping of cold atoms using dipole and radiative forces in an optical trap
复制标题
在光阱中利用偶极子和辐射力有效捕获冷原子
DOI：
10.1103/physreva.100.063426
复制
发表时间：
2019
影响因子：
2.9
通讯作者：
Tojo Satoshi
中科院分区：
文献类型：
--
作者：
Mashimo Taro;Abe Masashi;Tojo Satoshi
本文报道了在近光共振区用单光阱方法对冷铷原子的稳定有效囚禁。近光共振条件下的光阱不仅包含偶极力，还包含辐射力，而远光共振条件下的光阱仅包含偶极力。在~ THz范围内，通过改变失谐量，测量了近光共振阱中原子的质心位置和原子的负载效率的空间行为.光阱中空间行为的时间依赖性表明，由于光偶极子与辐射力之间的平衡条件依赖于光阱激光失谐量，原子稳定保持的合适位置发生了变化。稳定位置不是高斯光束光学系统中的主要焦点位置，它仅取决于由于辐射力的变化而引起的激光失谐，而与激光强度的变化无关，这导致辐射力和偶极力之间的平衡。
We report on the stable effective trapping of cold rubidium atoms by a method for a single optical trap in the near-optical resonant regime. An optical trap with the near-optical resonance condition consists of not only the dipole but also the radiative forces, while a trap using a far-off resonance dominates only the dipole force. We measure the spatial behaviors of the center-of-mass positions and the loading efficiencies of the trapped atoms in the near-optical resonant trap, by changing the detuning over the range oftoTHz from theresonance. The time dependence of the spatial behavior in the trap indicates that the suitable positions for stably holding atoms are altered because the equilibrium condition between the optical dipole and the radiative forces depends on the trap laser detuning. The stable position, which is not a primary position of focus in the Gaussian beam optics, depends only on the laser detuning due to the change in the radiative force, while it is independent of the change in the laser intensity, which results in a balance between the radiative and dipole forces.