On 6/7/19 3:32 PM, Michael Wouters wrote:
As promised, here's one pertinent paper, about using cryogenic
sapphire oscillators at mm-wavelengths ( 1 mm = 300 GHz ).
https://arxiv.org/pdf/1106.0021.pdf
It's not the one I was looking for but it's a useful entry point.
One interesting number is that at one mm, the coherence time is
limited to at most tens of seconds because of atmospheric turbulence.
Table 3 is worth a look too.
Cheers
Michael
"The temperature sensitivity limits the performance. For example if the
ambient temperature changes by 1ͦC in 500 s, the temperature coefficient
of 10 ps K-1 limits performance to about 2×10-14"
Ain't that the truth...
A nice paper describing a lot of the trials and tribulations of high
performance oscillator measurement.
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