[time-nuts] "The Penultimate HP5065 A15"

[Bruce Griffiths]

> On 04 August 2020 at 10:32 Poul-Henning Kamp <phk at phk.freebsd.dk> wrote:
> 
> 
> --------
> Attila Kinali writes:
> 
> >> The main reason I dont just repair/replace the A15 is that 
> >> I want to find out how much instability the PSU contributes.
> >
> >There are very few points where supply voltage (in)stability
> >contributes to long term frequency drift in a Rb vapor cell standard.
> 
> Obviously.
> 
> But it does contribute quite a lot on the sub-hour time-scale, some
> of it via temperature-dependencies.
> 
>
> >
> >For this to be a valid test, you also need to switch the
> >polarity of the light, otherwise you excite different states
> >with slightly different magnetic dependence.
> 
> "polarity of the light" - You mean the direction ?

More likely polarisation switching was intended.
eg between LH and RH circularly polarised light.
A linear polariser and a quarter waveplate are required to produce circularly polarised light from the unpolarised light emitted by a rubidium lamp.


Bruce

> 
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