论文标题
激光强度波动对1064 nm显微镜光学镊子中单个占原子捕获寿命的影响
Influence of Laser Intensity Fluctuation on Single-Cesium Atom Trapping Lifetime in a 1064-nm Microscopic Optical Tweezer
论文作者
论文摘要
一个由红色分析的1064 nm激光器的强烈聚焦的单空间模式高斯束组成的光学镊子可以在光强度的最强点上限制单个cesium（CS）原子。我们可以将其用于连贯对单量子钻头和单光子源的操纵。由于背景原子的影响，光学镊子的激光强度波动以及原子的残留热运动，光学镊子中原子的捕获寿命非常短。在本文中，我们分析了背景压力的影响，光镊的陷阱频率以及光学镊子对原子捕获寿命的参数加热。结合基于声学调制器（AOM）的外部反馈循环，在时间域中，1064 nm激光器的强度波动从$ \ pm $ \ pm $ 3.360 $ \％$ \％\％\％至$ \ pm $ \ $ \ $ 0.064 $ \％\％$ \％$ \％$ \％$，以及抑制带的抑制带量及其抑制频道大约33 khz。微观光学镊子中单个CS原子的捕获寿命从4.04 s延长到6.34 s。
An optical tweezer composed of a strongly focused single-spatial-mode Gaussian beam of a red-detuned 1064-nm laser can confine a single-cesium (Cs) atom at the strongest point of the light intensity. We can use this for coherent manipulation of single-quantum bits and single-photon sources. The trapping lifetime of the atoms in the optical tweezers is very short due to the impact of the background atoms, the laser intensity fluctuation of optical tweezer and the residual thermal motion of the atoms. In this paper, we analyzed the influence of the background pressure, the trap frequency of optical tweezers and the parametric heating of the optical tweezer on the atomic trapping lifetime. Combined with the external feedback loop based on an acousto-optical modulator (AOM), the intensity fluctuation of the 1064-nm laser in the time domain was suppressed from $\pm$ 3.360$\%$ to $\pm$ 0.064$\%$, and the suppression bandwidth reached approximately 33 kHz. The trapping lifetime of a single Cs atom in the microscopic optical tweezer was extended from 4.04 s to 6.34 s.
