When I was working on fiber optic communication test,
I remember hearing about lasers that were "tuned" with
variable Peltier coolers. Power consumption is critical in
a cesium standard that can run on batteries. Maybe
the power consumption of the coolers is a deal breaker.
Rick
On 3/3/2018 6:18 PM, Hal Murray wrote:
Thanks.
rich...@karlquist.com said:
2. Magnetic state selection, as used in the 5071A, would be replaced by
optical pumping. Len Cutler was heartbroken that HP/Agilent management
wouldn't fund this effort.
It turns out that, even now in 2018, optical pumping is not ready for prime
time in a working standard because the lasers drift over time.
Is there something fundamental in there, or is the lack of products because
nobody has made the big investment required to figure out how to do it.
What is the bandwidth of the laser? What happens if it drifts slightly? Can
it be servoed? ...
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