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, cdel...@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 _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
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