Poul-Henning,
On 09/29/2015 10:01 PM, Poul-Henning Kamp wrote:
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In message <560ac40b.1040...@rubidium.dyndns.org>, Magnus Danielson writes:
If possible, I'd also check the spectrum of the lamp before and after
the filter, depending on different lamp voltages, temperatures and
filter temperatures. But that depends on having an optical spectrometer.
The anti-pump line can be bothersome. This is where I like Corby's approach.
I must admit that at least in the first iteration, I only plan to
try to improve the electronics.
Physics, including Corbys filter idea will be second iteration.
My measurement of the lamp supply sensitivity was mainly intended
to provide data on the required level of power supply stability.
I see that there is room for both approaches. The filter helps a lot,
and clears the table with that aspect, so we can focus on intensity
variations.
What I like about your approach is that you look at other stuff and try
to see what is also un-attended to. For instance, the lamp oscillator is
open-loop, so supply voltage and temperature effects will factor in
undamped. Servo up the intensity seems to be the remedy there.
What about the C-field, can we servo up that by looking at the side-band
Rabi/Ramsey pedistals? Yes, it should be there, but I haven't had the
time to measure it. Doing that would require hacking into the
synthesizer side and jump around on the 5,3 MHz signal much as you would
do to the 12 MHz signal for Cesiums.
Servo or stabilize, it's interesting to see what stuff we can play
around with on these large rubidiums, which seems to offer the
possibility for improvements over what their original designs allowed for.
Cheers,
Magnus
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