[time-nuts] PTTI 2012, part 2

Bob Camp lists at rtty.us
Tue Dec 4 23:55:04 UTC 2012


A few kilometers of optical fiber should do the trick. Servo the fiber temperature to keep things locked up. 


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
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> Never attribute to malice what can adequately be explained by incompetence.
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