The portable CPT atomic clocks — recent developments

The authors are developing a portable CPT atomic clock, trying to refine the firmware to reduce power, improve performance, and ensure reliable operation over the expected range of environmental conditions. The overall volume of the physics package is less than 2 cm 3 , with resonance cell size of φ3mmx3mm, filled with Rb atomics and buffer gases. The portable CPT atomic clock is a complete packaged atomic clock, with overall size of 20 cm 3 , power consumption about 750mW, and short-term stability of 3-5×10 −12 /100s. The magnitude and power is smaller than previous prototype. The portable CPT atomic clock itself may find applications in broadband, secure communications, and precise location and navigation systems.