A focussing funnel for metastable helium

G. Labeyrie; A. Browaeys; W. Rooijakkers; D. Voelker; J. Grosperrin; B. Wanner; C. I. Westbrook; A. Aspect

doi:10.1007/s100530050577

A focussing funnel for metastable helium

G. Labeyrie, A. Browaeys, W. Rooijakkers, D. Voelker, J. Grosperrin, B. Wanner, C. I. Westbrook, A. Aspect

Research output: Contribution to journal › Article › peer-review

Abstract

We have constructed a magneto-optical funnel for He atoms and studied its properties using a laser cooled, highly mono-energetic atomic beam. A simple model of its action allows us to quantitatively understand the observed spot size and "focal length". We show that for a fast beam, the velocity damping coefficient plays an important role in determining the focal length of the device. The observed spot size is limited mainly by transverse heating processes which impose a transverse velocity spread. The device also permits easy scanning of the focussed spot.

Original language	English
Pages (from-to)	341-350
Number of pages	10
Journal	European Physical Journal D
Volume	7
Issue number	3
DOIs	https://doi.org/10.1007/s100530050577
Publication status	Published - 1 Jan 1999
Externally published	Yes

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AU - Labeyrie, G.

AU - Browaeys, A.

AU - Rooijakkers, W.

AU - Voelker, D.

AU - Grosperrin, J.

AU - Wanner, B.

AU - Westbrook, C. I.

AU - Aspect, A.

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N2 - We have constructed a magneto-optical funnel for He atoms and studied its properties using a laser cooled, highly mono-energetic atomic beam. A simple model of its action allows us to quantitatively understand the observed spot size and "focal length". We show that for a fast beam, the velocity damping coefficient plays an important role in determining the focal length of the device. The observed spot size is limited mainly by transverse heating processes which impose a transverse velocity spread. The device also permits easy scanning of the focussed spot.

AB - We have constructed a magneto-optical funnel for He atoms and studied its properties using a laser cooled, highly mono-energetic atomic beam. A simple model of its action allows us to quantitatively understand the observed spot size and "focal length". We show that for a fast beam, the velocity damping coefficient plays an important role in determining the focal length of the device. The observed spot size is limited mainly by transverse heating processes which impose a transverse velocity spread. The device also permits easy scanning of the focussed spot.

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DO - 10.1007/s100530050577

M3 - Article

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SP - 341

EP - 350

JO - European Physical Journal D

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A focussing funnel for metastable helium

Abstract

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