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Lena/Nov 2016: Difference between revisions
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# Banana jack (except the nut) http://www.mouser.com/ProductDetail/Johnson-Cinch-Connectivity-Solutions/108-0903-001/?qs=sGAEpiMZZMuIC3ROaEqRYUclhTyEUpND
# Pin headers http://www.mouser.com/ProductDetail/Molex/22-28-4363/?qs=sGAEpiMZZMs%252bGHln7q6pm%252bS0pk2Wo0XxTAhHStsXU8w%3d
== 11/07/2016 ==
=== Pump modulation and noise ===
We are trying to verify whether the drifts in the pump laser are the reason why our measured magnetic field noise is so large. We have really low probe noise, around 1 fT/sqrt(Hz), and the measured magnetic field noise was consistently higher than 10 fT/sqrt(Hz), especially at the frequency below 10-20 Hz in WIMR. The SQUID measurements suggest that it should be ~5 fT/sqrt(Hz).
We modulated the pump current, which modulated both optical frequency and power at 10 Hz. The change in frequency was ~1 GHz, and the change in power was ~0.02%. It produced a 1.5 pT peak in the magnetic signal. That's 1.5 fT per 1 Mhz, or 20 ppm of optical power change.
* [[File:2016.11.07 Pump Modulation Data.pdf|Zack's notes]]
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