Package for chip scale magnetometer or atomic clock

A device configured to operate as an atomic clock or as a magnetometer, the device comprising:

• power source contact pads;
• a vapor cell comprising an alkali metal vapor;
• first and second photodetectors;
• a laser configured to excite an electron transition in the alkali metal vapor, the laser positioned to provide an optical signal directed through the vapor cell and towards the first photodetector;
• a polarizing beam splitter positioned between the vapor cell and the first photodetector to receive the optical signal and to split the optical signal into:
• a first signal directed toward the first photodetector:
• and a second signal directed toward the second photodetector, the first signal being orthogonal to the second signal;
• and
• first, second and third sets of conductive coils coupled to the power source contact pads, the first, second and third sets of conductive coils configured to:
• when powered, magnetically isolate the vapor cell in a first mode for the device to operate as the atomic clock;
• and when unpowered, magnetically unnisolate the vapor cell in a second mode for the device to operate as the magnetometer.