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J.G.C. Tempelaars R.J.W. Stas P.G.M. Sebel H.C.W. Beijerinck E.J.D. Vredenbregt 《The European Physical Journal D - Atomic, Molecular, Optical and Plasma Physics》2002,18(1):113-121
We employ laser cooling to intensify and cool an atomic beam of metastable Ne(3
s) atoms. Using several collimators, a slower and a compressor we achieve a 20Ne* flux of 6×10
10
atoms/s in an 0.7 mm diameter beam traveling at 100 m/s, and having longitudinal and transverse temperatures of 25 mK and 300μK, respectively. This constitutes the highest flux in a concentrated beam achieved to date with metastable rare gas atoms.
We characterize the action of the various cooling stages in terms of their influence on the flux, diameter and divergence
of the atomic beam. The brightness and brilliance achieved are 2.1 ×10
21
s-1m-2sr-1 and 5.0 ×10
22
s-1m-2sr-1, respectively, comparable to the highest values reported for alkali-metal beams. Bright beams of the 21Ne and 22Ne isotopes have also been created.
Received 22 June 2001 相似文献
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B. Smeets R. W. Herfst L. P. Maguire E. te Sligte P. van der Straten H. C. W. Beijerinck K. A. H. van Leeuwen 《Applied physics. B, Lasers and optics》2005,80(7):833-839
We report results of the first laser collimation of a thermal beam of Fe atoms on the leaky 5D4 5F5 transition, with both parallel linear xx and crossed linear xy laser polarization configurations. The measured atomic beam divergence is compared to a rate-equation model and a quantum Monte Carlo model. The experimental values for the divergence are limited by the finite laser line width, which is comparable to the natural line width of the Fe atom. In general, flux decreases with higher intensities, showing the effect of the leaky transition. At the best beam collimation RMS = 0.17 mrad, which is for a detuning of = – and a saturation parameter of s = 6, the flux decreased to approximately 70%. Highest flux was measured for a detuning of = –2 and s = 4, reaching 135% of the uncooled value. From our measurements we estimate the total leak rate to be 1/(240 ± 40), which is in good agreement with the literature value of 1/244. The crossed linear polarization configuration is the better choice, with a slightly better collimation but the same atomic beam flux. Plugging of the largest leak would increase the flux to at least 80% of the closed transition value, resulting in better contrast for atom lithography. 相似文献
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M. W. Beijerinck 《Colloid and polymer science》1910,7(1):16-20
Ohne Zusammenfassung 相似文献
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