[time-nuts] Pressure sensitivity of Rb vapor cell standards

[ew]

I think a member has been working on it with a couple of 5065's. I think it would be easier with FRK and M100, many around with bad or weak lamps. Easy access to lamp and optics. We have some ideas but booked for the next 9 months.Bert Kehren


In a message dated 2/17/2020 7:17:00 PM Eastern Standard Time, magnus at rubidium.se writes:

Hi,In the 5065 and most others, the light intensity is not stabilized. It should not be too hard to regulate the Rb lamp amplitude and servo it to light intensity from the detector. Didn't Poul-Henning check this?Cheers,Magnus
-------- Originalmeddelande --------Från: Attila Kinali <attila at kinali.ch> Datum: 2020-02-17  16:56  (GMT-06:00) Till: Discussion of precise time and frequency measurement <time-nuts at lists.febo.com> Ämne: [time-nuts] Pressure sensitivity of Rb vapor cell standards Moin,I'm currently going through some of my old stuff and stumbledover [1], which, I think, has not been mentioned here. ButI remember a few people talking about compensating the 5065for pressure sensitivity. I also recommend having a look at Nil's paper[2], which discussesthe placment of the whole cell in hermetically sealed box forpressure stability and notes that there is a residual barometricpressure shift related to temperature changes. The paper containsalso a lot of pointers of what to look for, for additional sourcesof instability in Rb vapor cells. Especially note that light shift,ie the frequency shift due to changes in light intensity are themajor source of instability (as noted in many other papers).            Attila Kinali[1] "Barometric Effect in Vapor-Cell Atomic Clocks",by Moreno, Pellation, Affolderbach, Mileti, 2018https://doi.org/10.1109/TUFFC.2018.2844020[2] "Long-Term Stability Analysis Toward <10−14 Level for a Highly CompactPOP Rb Cell Atomic Clock" by Almat, Gharavipour, Moreno, Guret,Affolderbach, Mileti, 2020https://doi.org/10.1109/TUFFC.2019.2940903-- <JaberWorky>    The bad part of Zurich is where the degenerates                throw DARK chocolate at you._______________________________________________time-nuts mailing list -- time-nuts at lists.febo.comTo unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.comand follow the instructions there.
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