Applied Physics B

, Volume 80, Issue 7, pp 833–839

Laser collimation of an Fe atomic beam on a leaky transition

  • B. Smeets
  • R. W. Herfst
  • L. P. Maguire
  • E. te Sligte
  • P. van der Straten
  • H. C. W. Beijerinck
  • K. A. H. van Leeuwen
Article

DOI: 10.1007/s00340-005-1811-8

Cite this article as:
Smeets, B., Herfst, R.W., Maguire, L.P. et al. Appl. Phys. B (2005) 80: 833. doi:10.1007/s00340-005-1811-8

Abstract

We report results of the first laser collimation of a thermal beam of Fe atoms on the leaky 5D45F5 transition, with both parallel linear πxπx and crossed linear πxπy 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 αRMS = 0.17 mrad, which is for a detuning of δ = −Γ and a saturation parameter of s = 6, the flux decreased to approximately 70%. Highest flux was measured for a detuning of δ = −2Γ 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.

PACS

32.80.Lg 32.80.Pj 42.50.Vk 

Copyright information

© Springer-Verlag 2005

Authors and Affiliations

  • B. Smeets
    • 1
  • R. W. Herfst
    • 1
  • L. P. Maguire
    • 2
  • E. te Sligte
    • 1
  • P. van der Straten
    • 1
  • H. C. W. Beijerinck
    • 1
  • K. A. H. van Leeuwen
    • 1
  1. 1.Department of PhysicsEindhoven University of TechnologyEindhovenThe Netherlands
  2. 2.School of PhysicsUniversity of MelbourneVictoriaAustralia