Wu Saijun, Plisson Thomas, Brown Roger C, Phillips William D, Porto J V
Joint Quantum Institute, NIST and University of Maryland, Gaithersburg, Maryland 20899, USA.
Phys Rev Lett. 2009 Oct 23;103(17):173003. doi: 10.1103/PhysRevLett.103.173003.
We demonstrate a magnetooptical trap (MOT) configuration which employs optical forces due to light scattering between electronically excited states of the atom. With the standard MOT laser beams propagating along the x and y directions, the laser beams along the z direction are at a different wavelength that couples two sets of excited states. We demonstrate efficient cooling and trapping of cesium atoms in a vapor cell and sub-Doppler cooling on both the red and blue sides of the two-photon resonance. The technique demonstrated in this work may have applications in background-free detection of trapped atoms, and in assisting laser cooling and trapping of certain atomic species that require cooling lasers at inconvenient wavelengths.
我们展示了一种磁光阱（MOT）配置，该配置利用了原子电子激发态之间光散射产生的光力。在标准的MOT激光束沿x和y方向传播时，沿z方向的激光束具有不同的波长，该波长耦合两组激发态。我们展示了在蒸汽池中对铯原子的高效冷却和捕获，以及在双光子共振的红边和蓝边的亚多普勒冷却。这项工作中展示的技术可能在捕获原子的无背景检测中，以及在辅助冷却某些需要不方便波长冷却激光的原子种类的激光冷却和捕获方面有应用。
