[time-nuts] Corby Dawson Super 5065a work can I use a miniature Rubidium

[paul swed]

Anton,
Not sure your email suggested a bad lamp. I think it was just the question
on the filter. If there is a lamp issue happy to suggest ways of perhaps
getting it going again that I have used. Maybe best off line since this has
been communicated before.
Regards
Paul
WB8TSL

On Sun, Nov 6, 2016 at 9:52 AM, Robert Watson via time-nuts <
time-nuts at febo.com> wrote:

> Actually some commercial rubidium clocks do use lasers. Check out the
> Microsemi SA.3Xm family.
>
> Nonetheless the point about the wavelength stability requirement is
> absolutely the case. There are some papers published about the SA.3X
> clocks. I can't post links to them, but a quick web search for "A
> commercial CPT rubidium clock" by Deng et al. should reveal all.
>
> R.
>
> On 6 November 2016 at 02:56, <cdelect at juno.com> wrote:
>
> > Anton,
> >
> > To answer both questions:
> >
> > You can use a Laser in place of the Rubidium lamp, however assuming the
> > problem is the lamp it would be cheaper to buy several LPRO units to
> > scavenge for a replacement lamp.
> >
> > How did you determine it's the lamp that is dead?
> >
> > Using a Laser is more complicated than it sounds. The Laser frequency has
> > to be stabilized at the proper wavelength. This usually requires a
> > combination of selecting the proper diode current as well as the proper
> > temperature. Even then the diode ages and drifts away from the proper
> > spot. Sometimes a separate Rubidium vapor cell is used to stabilize the
> > frequency of the diode.
> >
> > The equipment to run the diode would take up MUCH more room than the
> > LPRO!
> >
> > This is why you don't find commercial Rubidiums using Laser diodes! (YET)
> >
> > The Super modification will not work on the miniature Rubidiums.
> > (although some do filter the lamp to get a better SN, however performance
> > is not anywhere near a Super.)
> >
> > The 5065A has a large cell and runs at a low temperature, this offers the
> > ideal stability and the chance to Super it.
> >
> > Even so not all 5065A can be Supered!
> >
> > Cheers,
> >
> > Corby Dawson
> >
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