Progress towards a compact and low-power miniaturized Rubidium Oscillator (mRO)

We report on the progress towards a miniaturized rubidium timing source based on double resonance (DR) in 85Rb. The clock technology is based on Orolia’s commercial rubidium clock adapted for low power and volume. The rubidium plasma-lamp has been replaced with a low power VCSEL (Vertical Cavity Surface Emitting Laser), and the size of the glass-blown rubidium vapor cell has been reduced to fit the complete physics package inside a commercial DIL-14 hermetic package. The clock volume is 50.8x50.8x19.5 mm3 (50 cm3) with a power consumption of 350 mW at room-temperature.