How about a "Laser-Cooled Mercury Ion Frequency Standard"?
http://tf.nist.gov/general/pdf/1225.pdf
Here's another approach:
"A diode-laser optical frequency standard based on laser-cooled Ca
atoms:Sub-kilohertz spectroscopy by optical shelving detection"
http://www.nist.gov/customcf/get_pdf.cfm?pub_id=105042
----- Original Message -----
From: "John Miles" <jmi...@pop.net>
To: <j...@quik.com>; "Discussion of precise time and frequency measurement"
<time-nuts@febo.com>
Sent: Tuesday, August 31, 2010 8:02 PM
Subject: Re: [time-nuts] homebrew maser
Microwave test gear and plumbing is very significantly harder to get at
24
GHz than at 1.4 GHz.
At a guess I've seen easily 100 times more stuff available at 1.4 GHz.
That is so far down the list of "101 Things That Are Hard About Building a
Hydrogen Maser" I'm not even sure it makes the top 101. :)
There is a ton of prior art in the Amateur Radio microwave community on 24
GHz microwave activity and construction. At 1.420 GHz, not so much.
-- john, KE5FX
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