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.
Bruce
paul swed wrote:
Basements the key. So for me bigger is better. Heck if its a rack thats ok.
It gets interesting in what types of components you can use if you are
willing to go larger.
Great point on the laser and optics. Funny thing is for small change you
can actually get used optics bench components at least at the last MIT flea
I ran across the items. They were snapped up by the way.
> From what I have seen of time-nuttery and Hydrogen masers I am actually not
all that sure its beyond this group.
Regards
Paul
On Tue, Dec 4, 2012 at 9:34 AM, Bob Camp<li...@rtty.us> wrote:
Hi
Indeed, you likely won't get USNO grade with a shoe box sized part. You can
get one to work and do quite good ADEV. No, I haven't done it, I'm just
going on what I've been told. The main point being that for a basement
project - smaller is probably lower cost.
Bob
-----Original Message-----
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On
Behalf Of Poul-Henning Kamp
Sent: Tuesday, December 04, 2012 9:19 AM
To: Discussion of precise time and frequency measurement; Bill Dailey
Subject: Re: [time-nuts] PTTI 2012, part 2
--------
In message
<CAMPhiorJihW9z6-q0+Qfd+GPLjs6e8_ovWrDxQoxV=92hgj...@mail.gmail.com>
, Bill Dailey writes:
If you look at the papers on portable rubidium fountains
they are significantly bigger than a shoebox (65 cm).
Diameter is controlled by dispersion of the launched atoms (=recovery rate)
and the layers of shielding.
65cm looked like close to a minimum for USNO grade, amateurs could probably
make do with less shielding.
--
Poul-Henning Kamp | UNIX since Zilog Zeus 3.20
p...@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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