Hi > On Feb 29, 2020, at 3:23 PM, Poul-Henning Kamp <[email protected]> wrote: > > -------- > In message <[email protected]>, Attila Kinali > writes: >> On Sat, 29 Feb 2020 13:44:59 -0500 > >> But, there is not much we can do about absorption/desorption. > > Actually, there are things you can do, but they are very > expensive. > > One of the early paths of experiments with optic fibers were > to replace the absorbed hydrogen with deuterium which is > slightly larger, in order to move the OH- absorption > peak away from the 1.3 micrometer band. (Bake at 1000°C > in a D2 atmosphere for a couple of hours). > > Stuffing bigger atoms into the gaps that way will reduce the > opportunities for other atoms to squeeze in. > > If you were *really* serious about it, you would start out growing > your quartz from monoisotopic silicon and oxygen, picking the smaller > silicon (28) and larger oxygen (18) in order to reduce the size > of the gaps to begin with. It will probably also do wonders for > your Q that all bonds are identical. > >> The diameter of the blank has to be scaled with its thickness, in >> order not to compromise the f*Q product. Which in turn makes it >> a bit problematic in terms of packaging, but nothing unsolvable. > > Isn't that where "whispering gallery" modes come into the picture ?
…… and done with sapphire. This is the real answer to “why is nobody going to do this?”. You already have something ( the sapphire resonators ) that does better than anything you could reasonably expect. Bob > > -- > Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 > [email protected] | TCP/IP since RFC 956 > FreeBSD committer | BSD since 4.3-tahoe > Never attribute to malice what can adequately be explained by incompetence. > > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to > http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com > and follow the instructions there. _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
