Rick,
On 03/18/2017 05:32 PM, Richard (Rick) Karlquist wrote:
On 3/18/2017 3:13 AM, Magnus Danielson wrote:
The NIST-7 was a optically pumped cesium beam, and a pre-cursor to the
fountain clocks. There should be a bunch of papers on it.
I am however somewhat wondering about if we will see this coming out of
Oscilloquartz. We will see.
NIST-7 has a reversible beam, which cancels out end to end phase
error in the CBT. That works in terms of being a frequency standard,
but not for a clock, because you don't have continuous operation.
NIST-7 is also much longer than the 5071A or the Oscilloquartz offering.
So they are not really comparable beyond sharing optical pumping.
I think you misunderstood my comment quite a bit.
It is merely a suggestion to find more articles on the topic of optical
pumpning beams.
One problem with the NIST-7 is also the poor S/N. It was used more for
frequency than continuous clock, but free-wheeling on commercial clocks
helps for the ensamble behavior.
Cheers,
Magnus
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