[time-nuts] Microsemi up for sale?

Richard (Rick) Karlquist richard at karlquist.com
Sat Mar 3 22:04:57 EST 2018


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.
> 
> 
> richard at 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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