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An optical tweezer composed of a strongly focused single-spatial-modeGaussian 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 forcoherent manipulation of single-quantum bits and single-photon sources. Thetrapping lifetime of the atoms in the optical tweezers is very short due to theimpact of the background atoms, the laser intensity fluctuation of opticaltweezer and the residual thermal motion of the atoms. In this paper, weanalyzed the influence of the background pressure, the trap frequency ofoptical tweezers and the parametric heating of the optical tweezer on theatomic trapping lifetime. Combined with the external feedback loop based on anacousto-optical modulator (AOM), the intensity fluctuation of the 1064-nm laserin the time domain was suppressed from $\pm$ 3.360$\%$ to $\pm$ 0.064$\%$, andthe suppression bandwidth reached approximately 33 kHz. The trapping lifetimeof a single Cs atom in the microscopic optical tweezer was extended from 4.04 sto 6.34 s.

Influence of Laser Intensity Fluctuation on Single-Cesium Atom Trapping Lifetime in a 1064-nm Microscopic Optical Tweezer