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Rubidium subminiature quantum frequency standard NAC-CPT

Rubidium subminiature quantum frequency standard NAC-CPT
Rubidium subminiature quantum frequency standard NAC-CPT

Fields of application:

  • satellite navigation systems, including those integrated with inertial navigation systems
  • synchronization of equipment and data transmission in high-speed computer networks
  • communication systems, including broadband communication with fast carrier switching and wavelength-division multiplexing
  • precision measuring equipment with strict requirements for the reference frequency generator (spectrum analyzers, vector generators, oscilloscopes, etc.)

The standard frequency is stabilized due to the effect of coherent population trapping (CPT). As a result of microwave modulation of the laser frequency, harmonics of the ± 1-order appear in the laser spectrum, which interact directly with the alkaline metal atoms in the gas cell. When the difference frequency between the harmonics is equal to the hyperfine splitting frequency of the ground state, a coherent nonabsorbing superposition of the atomic ground states arises. This effect is called CPT.

Dimensions 60 cm3
Power consumption 800 mW
Output frequency 5 and 10 MHz
Short-term frequency instability (for 1 s) 3 × 10-11
Long-term frequency instability (for 1 day) 5 × 10-12

  • the possibility of reducing the size of the entire standard, as well as achieving low power consumption, since there is no need for a huge microwave resonator and implementation of subminiature MEMS gas cells and VCSEL lasers
  • low short-term frequency instability
  • low long-term frequency instability
  • * Based on CPT compared to other small-sized standards

    • physical block consists of:
        emitting laser
      • photodiode
      • thermal stabilization system
      • integral gas cell
    • frequency standard control system
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