Influence of laser intensity fluctuation on single-cesium-atom trapping lifetime in a 1064-nm microscopic optical tweezer
Influence of laser intensity fluctuation on single-cesium-atom trapping lifetime in a 1064-nm microscopic optical tweezer
复制标题
激光强度波动对 1064 nm 显微光镊中单铯原子捕获寿命的影响
DOI：
10.3390/app10020659
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发表时间：
2020
期刊：
影响因子：
--
通讯作者：
Junmin WANG
中科院分区：
文献类型：
--
作者：
Rui SUN;Xin WANG;Kong ZHANG;Jun HE;Junmin WANG
由1064 nm红失谐激光的强聚焦单空间模高斯光束组成的光镊可以将单个铯原子限制在光强的最强点。我们可以用它来相干操纵单量子比特和单光子源。由于背景原子的撞击、光镊的光强起伏以及原子的残余热运动等因素，原子在光镊中的囚禁寿命很短。本文分析了背景气压、光镊的囚禁频率以及光镊的参量加热对原子囚禁寿命的影响。结合基于声光调制器（AOM）的外反馈回路，将1064 nm激光在时域的光强起伏从3.360$\%$抑制到0.064$\%$，抑制带宽达到33 kHz左右。单个Cs原子在显微光镊中的囚禁寿命从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.