[time-nuts] CCD lock detection (was: DIY Physics Article)
actast at hotmail.com
Wed Feb 22 20:01:53 UTC 2012
That is interesting, I spoke with a friend at NIST and they were still using discrete components on the prototypes developed as part of the CSAC for symmetricom. Coherent population must have been how they made a very labor intensive prototype affordable. My thought on a CCD were directed more toward high dollar products like the 5071A where you may be able to see information related to signal quality and tube life with greater ease the the current Alpha Numeric displays.
> Date: Wed, 22 Feb 2012 20:33:57 +0100
> From: attila at kinali.ch
> To: time-nuts at febo.com
> Subject: Re: [time-nuts] CCD lock detection (was: DIY Physics Article)
> On Wed, 22 Feb 2012 10:57:01 -0800
> Chris Albertson <albertson.chris at gmail.com> wrote:
> > I think the next generation of Rb physics packages will use a laser as
> > the light source and have the laser, Rb cell and detector all in one
> > glass envelope. I've seen one like this that is just tiny. But as I
> > recall there was a problem using a laser, something about noise
> That's called coherent population trapping and is used by the
> chip scale atomic clock (CSAC) from symetricon (although they use
> it with caesium instead of rubidium).
> You can find in  a quite good and easy to understand explanation of
> the physics of an Rb based clock. It also contains an overview of what
> is currently known to be possible and where some of the problems are
> Attila Kinali
>  http://www.pi5.uni-stuttgart.de/common/show_file.php/lectures/100/blaetter/The%20Rubidium%20Clock%20and%20Basic%20Research.pdf
> Why does it take years to find the answers to
> the questions one should have asked long ago?
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