[time-nuts] Optical Cesium or maybe Cesium "light"!

Bruce Griffiths bruce.griffiths at xtra.co.nz
Sat Mar 18 04:05:00 EDT 2017


An Early (~1980?) NS/FEI paper on optically pumped cesium beam tubes:

http://tf.nist.gov/general/pdf/732.pdf

Bruce

> 
>     On 18 March 2017 at 17:28 "Richard (Rick) Karlquist" <richard at karlquist.com> wrote:
> 
>     Len Cutler was all set to build an optically
>     pumped Cs beam 20 years ago. Even then, he could get the lasers.
>     He was only missing one thing: money. HP management never
>     agreed to fund it. The paper conspicuously omits any spec
>     on absolute accuracy. The optical pumping does nothing to
>     improve that AFAIK. It still depends on phase error in the CBT.
>     The 5071 has a guaranteed accuracy of 10^-12, and is typically
>     several times better than that.
> 
>     It is surprising that none of the various makers of the 5071A
>     ever made an optical version. I wonder what they are thinking
>     now that someone else has done it.
> 
>     Rick
> 
>     On 3/17/2017 7:48 PM, cdelect at juno.com wrote:
> 
>         > > 
> >         Looks like Oscilloquartz is getting ready to sell this commercially!
> >         Will give the 5071A a run for the money!
> >         Reliability should go way up as:
> >         -No electron multiplier
> >         -No ionizer filament
> >         -No state selection magnets
> >         Also all the fiddley bits (laser diodes and photodetectors) are external
> >         to the tube and can be easily updated as needed.
> > 
> >         https://www.slideshare.net/ADVAOpticalNetworking/performance-results-of-a
> >         n-optically-pumped-cesium-beam-clock
> > 
> >         Cheers,
> > 
> >         Corby
> > 
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