> On 04 August 2020 at 10:32 Poul-Henning Kamp <p...@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 > > _______________________________________________ > time-nuts mailing list -- time-nuts@lists.febo.com > To unsubscribe, go to > http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com > and follow the instructions there. _______________________________________________ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.