The bichromatic force has been used to both slow and collimate a beam of metastable 2³S He atoms (He*). The collimation capture range is an extraordinary ±85 m/s corresponding to ~0.18 radians from our source. Both slowing and collimation were accomplished in the unprecedented short distance of ~5 cm each. The overall brightness increase is ×3200, and there is potential for considerably more.
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Partlow et al. (2004) studied this question.
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