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

[Bob Camp]

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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