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Hansuek Lee1, Myoung-Gyun Suh, Tong Chen

  • 11] T.J. Watson Laboratory of Applied Physics, California Institute of Technology, Pasadena, California 91125, USA [2] hQphotonics, Pasadena, California 91106, USA.

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|September 18, 2013
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Summary
This summary is machine-generated.

Researchers developed a chip-based optical reference cavity to improve resonator stability. This miniaturized system enhances frequency references for navigation, communication, and timekeeping applications.

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Area of Science:

  • Physics
  • Optical Engineering
  • Metrology

Background:

  • Frequency references are critical for radio, microwave, and timekeeping systems, impacting navigation, communication, and remote sensing.
  • An optical revolution has led to highly precise clocks and low-noise microwave signals based on laser reference cavities.
  • Current high-performance systems are laboratory-bound, driving interest in miniaturization for on-chip applications.

Purpose of the Study:

  • To develop a miniaturized, chip-based optical reference cavity for enhanced resonator stability.
  • To overcome limitations of current laboratory-based frequency reference systems.
  • To enable on-chip integration of high-performance frequency references.

Main Methods:

  • Utilized a chip-based optical reference cavity design.
  • Employed spatial averaging of thermorefractive noise to enhance resonator stability.
  • Integrated stabilized fiber lasers for phase-noise reduction.

Main Results:

  • Achieved a relative Allan deviation of 3.9 × 10⁻¹³ at 400 μs averaging time.
  • Demonstrated an effective linewidth below 100 Hz.
  • Reduced phase noise by over 26 dB.

Conclusions:

  • The chip-based optical reference cavity significantly enhances resonator stability.
  • This miniaturized system offers a pathway towards on-chip frequency references.
  • The technology has the potential to impact navigation, communication, and timekeeping systems.