Attila Kinali

> If i were able to build a working optical clock, i would just buy > a frequency comb. The 10k€ for a comb would be cheap compared to the > money spend on the rest of the clock :-) Hmm, not sure what you're looking at, but I have a commercial erbium fibre comb in my lab and it cost 250 000 Euro. There are two full height 19 inch racks full of electronics. It has an extra output for 1000 to 2000 nm though, so you could probably knock 50K off the price for that. Another interesting data point: some people I know in a national measurement lab built and sold a Cs fountain to another lab. The price was US 2 million and I'm guessing that was "mates' rates". Cheers Michael On Thu, Nov 3, 2016 at 8:13 AM, Attila Kinali <attila@kinali.ch> wrote: > On Thu, 3 Nov 2016 07:42:13 +1100 > Michael Wouters <michaeljwouters@gmail.com> wrote: > >> One other vital component is the flywheel oscillator you need to take >> advantage of the fabulous stability you now have at hand.We had a cryogenic >> sapphire oscillator for our (microwave) clock. > > Yes, a lot of the optical clocks are using a hydrogen maser as local > oscillator. Ie you need an atomic clock to build an atomic clock. > > >> For an optical clock, you're also going to need a frequency comb to get >> back into the RF domain. > > If i were able to build a working optical clock, i would just buy > a frequency comb. The 10k€ for a comb would be cheap compared to the > money spend on the rest of the clock :-) > > Attila Kinali > > > -- > Malek's Law: > Any simple idea will be worded in the most complicated way. > _______________________________________________ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there.

			Attila Kinali

On Thu, 3 Nov 2016 17:38:23 +1100 Michael Wouters <michaeljwouters@gmail.com> wrote: > > If i were able to build a working optical clock, i would just buy > > a frequency comb. The 10k€ for a comb would be cheap compared to the > > money spend on the rest of the clock :-) > > Hmm, not sure what you're looking at, but I have a commercial erbium > fibre comb in my lab and it cost 250 000 Euro. There are two full > height 19 inch racks full of electronics. It has an extra output for > 1000 to 2000 nm though, so you could probably knock 50K off the price > for that. Interesting.... The 10k was the price I was told, when I asked a couple of stupid questions at last EFTF. But maybe those weren't octave spanning combs, which would be required for such an application. > Another interesting data point: some people I know in a national > measurement lab built and sold a Cs fountain to another lab. The price > was US 2 million and I'm guessing that was "mates' rates". I would guess so too. 2 mio sounds rather cheap for such a device and considering that all parts are hand made and assembled by expensive grad students and even more expensive senior researchers. 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