On Wed, 21 Feb 2018 18:10:17 +0000 "Poul-Henning Kamp" <p...@phk.freebsd.dk> 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. > If you want to do it with a LED, I think it needs to be a stabilized > LED-Laser. The problem with a Laser is that you need to lock it to the right line. This requires either some significant change to the electronics of the Rb standard, or an additional vapor cell and some optics to lock it to that cell. Neither is trivial (apparently, according to the papers I've read, not difficult, but I don't trust that until I have tried myself). Attila Kinali -- It is upon moral qualities that a society is ultimately founded. All the prosperity and technological sophistication in the world is of no use without that foundation. -- Miss Matheson, The Diamond Age, Neil Stephenson _______________________________________________ time-nuts mailing list -- email@example.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.