[time-nuts] MIT 2 inch cesium fountain, optically pumped

Mark Kahrs mark.kahrs at gmail.com
Mon Nov 24 14:05:00 UTC 2014


For those who are interested, a relevant dissertation can be found here:

http://dspace.mit.edu/bitstream/handle/1721.1/71453/795174737.pdf

Unfortunately, you can't print it, but you can read it.  A rather complete
discussion of the construction of the experimental apparatus is included.


On Thu, Nov 20, 2014 at 5:57 PM, Bob Camp <kb8tq at n1k.org> wrote:

> HI
>
> I saw that when it came out. It’s a CSAC based gizmo and thus a gas cell
> rather than a beam tube / state selection device.
>
> Bob
>
> > On Nov 20, 2014, at 8:37 AM, Peter Torry <peter.torry at talktalk.net>
> wrote:
> >
> > Hi Bob,
> >
> > Some time ago Hoptroff  produced a Cs pocket watch using the Symmetricom
> SA45s - now how long for a wrist watch !!
> >
> > http://www.engadget.com/2013/05/01/hoptroff-no-10/
> >
> > Peter
> > (still pendulum controlled)
> >
> >
> >
> > On 20/11/2014 12:38, Bob Camp wrote:
> >> Hi
> >>
> >> So the wrist watch sized fountain that was promised 15 years ago isn’t
> gong to be here for Christmas this year?
> >>
> >> Bob
> >>
> >>> On Nov 20, 2014, at 12:17 AM, Magnus Danielson <
> magnus at rubidium.dyndns.org> wrote:
> >>>
> >>> Hi Rick,
> >>>
> >>> They did not mention the complexity of the laser system they needed,
> especially considering that the optical bench of a fountain isn't all that
> small, and also because they want to de-tune lasers. While they seems to
> have an idea, they didn't touch on that subject.
> >>>
> >>> Nice to see that people think in a different way thought.
> >>>
> >>> Looking forward to see the progress on this one.
> >>>
> >>> Cheers,
> >>> Magnus
> >>>
> >>> On 11/20/2014 05:24 AM, Richard (Rick) Karlquist wrote:
> >>>> See:
> >>>>
> >>>> http://newsoffice.mit.edu/2014/portable-atomic-clocks-1112
> >>>>
> >>>> Any comments?
> >>>>
> >>>> Rick Karlquist N6RK
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