Interactions in Dense Atom Traps

该项目的目标是产生密集的激光冷却原子源，并了解这些密集原子的碰撞和辐射特性。激光冷却的致密原子云将在全息原子陷阱(HAT)中产生，全息原子陷阱(HAT)是通过发射高功率连续波激光穿过全息位相元件，然后将衍射图案想象到暗磁光陷阱内形成的原子云而产生的。多重散射光的影响关键取决于原子的非共振吸收光谱，据预测，该光谱的线宽很窄，但最大值很大，即使在激光调谐到远离共振的情况下，最稠密的帽子云也会在光学上变厚。将对这种影响进行测量。帽子中的高密度还将首次允许系统地研究原子钟以外的超冷碰撞频率漂移。

The goals of this project are to produce dense sources of laser-cooled atoms, and to understand the collisional and radiative properties of these dense atoms. The dense atom cloud of laser-cooled rubidium atoms will be generated in a holographic atom trap (HAT), which is produced by sending a high power continuous-wave YAG laser through a holographic phase element, then imagining the diffraction pattern onto a cloud of atoms formed inside a dark magneto-optical trap. The effects of multiply scattered light depend crucially on the off-resonant absorption spectrum of the atoms, which is predicted to have a narrow linewidth, but a large maximum value, making the densest HAT clouds optically thick even when the laser light is tuned far off resonance. Measurements of this effect will be made. The high densities in the HAT will also allow for the first time systematic studies of ultracold collision frequency shifts outside the context of atomic clocks.