研究目的
Investigating the influence of laser intensity fluctuation on the trapping lifetime of single-cesium atoms in a 1064-nm microscopic optical tweezer.
研究成果
The suppression of laser intensity fluctuation extended the trapping lifetime of single-Cs atoms in the microscopic optical tweezers from 4.04 s to 6.34 s. The feedback bandwidth in the frequency domain reached approximately 33 kHz, covering the axial trap frequency and its double frequency of the optical tweezer.
研究不足
The trapping lifetime of single-Cs atoms in the optical tweezer is mainly limited by atomic collisions under the typical pressure of approximately 6 × 10?7 Pa. The suppression effect of the laser intensity fluctuation feedback loop cannot be kept at the same level due to the long duration of the experimental process.
1：Experimental Design and Method Selection
The experiment involved analyzing the influence of background pressure, trap frequency of optical tweezers, and laser intensity fluctuation on atomic trapping lifetime. A feedback loop based on an acousto-optical modulator (AOM) was used to suppress laser intensity fluctuation.
2：Sample Selection and Data Sources
Single-cesium atoms were trapped in a microscopic optical tweezer formed by a strongly focused single-spatial-mode Gaussian beam of a red-detuned 1064-nm laser.
3：List of Experimental Equipment and Materials
1064-nm laser (DBR-1064P, Thorlabs), Ytterbium-doped ?ber ampli?er (YDFA), acousto-optical modulator (AOM), single-photon counting module (SPCM), function generator (Model DG635 SRS), PID (Model SIM960, SRS).
4：Experimental Procedures and Operational Workflow
The experiment involved capturing single-atoms in a magneto-optical trap (MOT), transferring them to an optical tweezer, and measuring the trapping lifetime under various conditions. The intensity fluctuation of the laser was suppressed using a feedback loop.
5：Data Analysis Methods
The trapping lifetime was measured and analyzed under different conditions of laser intensity fluctuation and background pressure. The suppression of laser intensity fluctuation was quantified in both time and frequency domains.
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1064-nm laser
DBR-1064P
Thorlabs
Used to form the optical tweezer for trapping single-cesium atoms.
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Function generator
DG635
SRS
Used to load modulation signals on the AOM to simulate intensity fluctuation.
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PID
SIM960
SRS
Used to control the diffraction efficiency of the AOM to stabilize laser intensity.
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Ytterbium-doped ?ber ampli?er
YDFA
Amplifies the 1064-nm laser beam.
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Acousto-optical modulator
3110-197
Crystal Technology
Used to suppress the intensity fluctuation of the 1064-nm laser.
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Single-photon counting module
SPCM
Used to detect fluorescence photons from trapped atoms.
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