[time-nuts] PTTI 2012, part 2
Bob Camp
lists at rtty.us
Tue Dec 4 23:55:04 UTC 2012
Hi
A few kilometers of optical fiber should do the trick. Servo the fiber temperature to keep things locked up.
Bob
On Dec 4, 2012, at 4:17 PM, Poul-Henning Kamp <phk at phk.freebsd.dk> wrote:
> --------
> In message <50BE4F1D.7020702 at xtra.co.nz>, Bruce Griffiths writes:
>> The lasers arent that difficult to make or expensive if one adopts a
>> modified Littrow ECDL configuration.
>> Laser diodes without AR coatings have been used successfully in such lasers.
>> Low noise current sources and close temperature control of the laser
>> diode chip are required.
>
> Wouldn't the right way to be to do an optical comb, use that to lock
> the lasers for the fountain, then lock the optical comb to the fountain ?
>
> (Yes, I know! :-)
>
> --
> Poul-Henning Kamp | UNIX since Zilog Zeus 3.20
> phk at FreeBSD.ORG | TCP/IP since RFC 956
> FreeBSD committer | BSD since 4.3-tahoe
> Never attribute to malice what can adequately be explained by incompetence.
>
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