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First observation: BEC!

Group: Sengstock

Authors and contributors: Holger Schmaljohann, Michael Erhard, Jochen Kronjaeger, Markus Kottke, Sebastian van Staa, Kai Bongs, Klaus Sengstock.

[Historical report created from GSU BEC Homepage:]

"In the early evening, September 23, we have realized a Rb-BEC in a new and compact setup at Hamburg University. Slow atoms from an upper 2D-MOT beam, similar to the one in Amsterdam, are captured within 10 sec in a lower 3D-MOT and subsequently transferred into an especially designed cloverleaf- and D-magnetic trap (255 Hz and 11 Hz measured trap frequencies). After 15 sec rf-evaporation we observe the onset of BEC in the usual time-of-flight images. In the first measurements we have measured 1 to 2 x 106 atoms in the condensate fraction.

On the figure above:
Left: condensate surrounded by thermal cloud; right: a nearly pure Bose-Einstein condensate.

These results were achieved by the team of

  • Holger Schmaljohann (Ph.D. student)
  • Michael Erhard (Ph.D. student)
  • Jochen Kronjaeger (Ph.D. student)
  • Markus Kottke (Ph.D. student)
  • Sebastian van Staa (diploma student)
  • Kai Bongs (post-doc)
  • Klaus Sengstock (professor)
with additional support by Jan Arlt and Wolfgang Ertmer from Hannover university.

We are looking forward to a lot of fun with BEC's in Hamburg. For further information, see the group web page."

Posted: 11 Aug 2005     Date: 23 Sep 2002

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