[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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