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Optics integrated compact cavity for rubidium atomic frequency standards.

Jaydeep Kaintura1, Ambrish Ghadiya1, Shilpi Soni1

  • 1Space Applications Centre, Indian Space Research Organisation, Ahmedabad 380015, Gujarat, India.

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Summary
This summary is machine-generated.

A compact rubidium atomic clock cavity with integrated optics was developed for satellite navigation. This miniaturized resonator achieves high performance, suitable for portable space applications.

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Area of Science:

  • Atomic Physics
  • Microwave Engineering
  • Optical Engineering

Background:

  • Development of atomic clocks for navigation systems requires miniaturized and robust components.
  • Rubidium atomic clocks offer high precision for Global Navigation Satellite Systems (GNSS).

Purpose of the Study:

  • To design and realize a compact magnetron cavity with integrated optics for a rubidium atomic clock.
  • To ensure the cavity is suitable for the Indian Regional Navigation Satellite System (IRNSS).

Main Methods:

  • Designed a cylindrical dielectric cell cavity resonating at the rubidium hyperfine ground-state frequency (6.8346 GHz) using the TE011 mode.
  • Employed a loop gap resonator for a uniform mode along the quantization axis.
  • Optimized cutoff frequency to minimize optical influence on the cavity mode.

Main Results:

  • The realized cavity demonstrated measured results matching RF simulations with up to 90% agreement.
  • Achieved a compact volume of 86 cm³ and a mass of 120 g.
  • The design ensures optical influence is negligible and within the cavity's tuning range.

Conclusions:

  • The developed compact magnetron cavity with integrated optics is a viable component for rubidium atomic clocks.
  • Its small size and mass make it ideal for portable, space-based navigation applications like IRNSS.