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Observation of cold atom output from an evanescent-light funnel
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View: Figures


Image of FIG. 1.
FIG. 1.

Funneling cold atoms using repulsive evanescent light excited in funnel optics by total internal reflection of a blue-detuned hollow light beam. Cold atoms released from an MOT are reflected again with Sisyphus cooling and are output from a small exit hole at the bottom.

Image of FIG. 2.
FIG. 2.

Experimental configuration using double MOTs to observe atoms output from the evanescent-light funnel. Each MOT consists of 3D cooling beams and anti-Helmholtz coils. The upper MOT is used to generate cold atoms inside the funnel optics, while the lower MOT with the CCD is used to detect the output atoms. An additional pumping light beam induces Sisyphus cooling. The funnel optics with a exit hole is composed of three glass plates.

Image of FIG. 3.
FIG. 3.

Net number of funneled atoms plotted as a function of the frequency detuning with respect to the , , transition, where the number of incident atoms is and the excitation light power is . We subtract the number obtained without the pumping light beam from that obtained with it.

Image of FIG. 4.
FIG. 4.

Flux intensity of output atoms calculated as a function of the light power, , and the exit-hole diameter, , where and . The estimated flux intensity is for and .


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Observation of cold atom output from an evanescent-light funnel