On 27/09/11 22:23, Poul-Henning Kamp wrote:
In message<cad2jfagqboeg-iyb5z2_rbjuldj7sbvc5bofpntk45rjesr...@mail.gmail.com>
, paul swed writes:
Boy I have to go back and check. I thought fountains used lasers and such to
slow the atoms down.
They do. And a microwave field.
But I still think it is easier to make work than the state selection magnets
in a CS.
Of course, there's also the laser-based cesium to consider.
I agree fully. The state selection magnets (Stern-Gerlach experiment)
needs to provide a strong gradient field which may be hard to build for
the amateur. Building working RF section, vacuum assembly, oven I rate
as simpler. Still lot of work to do.
Laser based state-selection and state-detection would indeed be
possible, and move the challenges to the optical bench.
One possible aspect to the laser based state-selection and
state-detection is that the target could be another oven, such that
alternating direction cycling can be used. This addresses the
phase-shift issue between the arms in the RF assembly, assuming
sufficient stability otherwise. The same issue would not be as dominant
in the fountain.
Cheers,
Magnus
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