[time-nuts] Thinking outside the box a super reference

Bruce Griffiths bruce.griffiths at xtra.co.nz
Sun Nov 6 04:36:17 EST 2016

Neither Rb cells nor isolators are difficult to source.They are both catalog items. However if using a cavity it may need to be tailored to the available cells.Walk-off isolators using double refraction are somewhat more convenient than those requiring a strong magnetic field.

    On Sunday, 6 November 2016 10:10 PM, Anders Wallin <anders.e.e.wallin at gmail.com> wrote:

> > Just for the heck of it, I'd go laser instead of the old UHF lamp.
> >
> > With respect to precision machining, that space has changed a lot
> > over the last five years, with precision CNC machines, factory
> > or home-built, dropping dramatically in price.
> Yes, the laser technique is doable even if one has to build an ECDL.
> What would be nice would be a scheme that allows the same Rb filled bulb
> to be used to both lock the laser to the right wavelength and to detect
> that the microwave signal is also locked to the Rb microwave transition.

FWIW we have the remains of this experiment somewhere in the basement - but
no time or resources to really play with it...
Fig 3 is a fairly clear overview of the two cells and loops, one for
stabilizing the laser wavelength, and one for the 3 GHz
For hobby tinkering I would expect the Rb-cells and the optical isolator to
be hard/expensive to source. Otherwise the electronics needed looks

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