Hi, On 02/22/2018 02:53 PM, Bob kb8tq wrote: > Hi > > >> On Feb 22, 2018, at 8:22 AM, Attila Kinali <[email protected]> wrote: >> >> On Wed, 21 Feb 2018 18:10:17 +0000 >> "Poul-Henning Kamp" <[email protected]> wrote: >> >>>> So the Rb85 "notch" filter might not get rid of all the unwanted light >>>> and some of this might depopulate the excited state of the Rb87 >>>> that are in the RF cavity. >>> >>> I have a hard time seeing how you can not get worse S/N that way. >> >> >> Well, the question is how much? Keep in mind that an Rb lamp is >> anything but a clean light source. > > The point is that it’s clean where it matters. It does not dump a bunch of > energy into the transitions that you want to avoid.
780 nm vs 795 nm if I recall correctly. A dash of energy isn't too critical, but it will de-pump the state and you will suffer with somewhat worse S/N. For a rubidiumlamp the two "lines" are about the same strength and fairly wide. The one thing to care about is polarization, since that will be a pulling through AC Stark so a quarter-wave window should be used. Servo the LED to the detected lamp response should help with stabilization. Cheers, Magnus _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
