Figure 1
From: A cold-atom Ramsey clock with a low volume physics package
(a) Simplified optical set-up. AOM label text colours corresponds to the optical transitions shown in (c). (b) Schematic of the cavity physics package. Trap light (purple arrow) propagates parallel to the magnetic bias field (black dashed arrow), 90:10 non-polarising beam splitter (NPBS) splits the optical pumping (blue arrow) and readout (green arrow) light onto a reference photodiode (\(\text {PD}_\text {Ref}\)) and signal photodiode (\(\text {PD}_\text {Sig}\)) after being retro-reflected by a mirror (M). Local oscillator (LO) is connected via a SMA vacuum feedthrough. (c) Optical and microwave transitions used in the experiment. Solid arrows indicate light carrier frequency, dashed arrows show repump frequencies derived from the EOM.
