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Serrodyne-Enabled Dual Electro-Optic Comb Interferometry for High-Precision Absolute Ranging and Integration-Ready

Xiaoyang Guo1, Xusheng Yang1, Jiawen Zhi1

  • 1National Gravitation Laboratory, MOE Key Laboratory of Fundamental Physical Quantities Measurement, School of Physics, Huazhong University of Science and Technology, Wuhan, 430074, China.

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Summary
This summary is machine-generated.

A new optical frequency comb (OFC) ranging system eliminates acousto-optic modulators (AOMs), using a serrodyne-modulated electro-optic modulator (EOM) for enhanced precision. This AOM-free approach achieves nanometric distance measurements and vibration sensing with improved flexibility and efficiency.

Keywords:
dual electro‐optic frequency combshigh‐precision absolute distance measurementnanometric vibration sensingphotonic integrationserrodyne modulation

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Area of Science:

  • Optics and Photonics
  • Metrology
  • Precision Engineering

Background:

  • Optical frequency combs (OFCs) are vital for precision metrology.
  • Traditional dual electro-optic frequency comb systems use acousto-optic modulators (AOMs) which limit performance.
  • AOMs restrict tuning flexibility, response speed, and power efficiency in frequency comb ranging.

Purpose of the Study:

  • To introduce an AOM-free dual electro-optic frequency comb ranging system.
  • To demonstrate superior phase coherence and high-precision distance measurement.
  • To showcase enhanced flexibility, reduced power consumption, and improved integration compatibility.

Main Methods:

  • Developed a dual electro-optic frequency comb ranging system.
  • Employed a serrodyne-modulated electro-optic modulator (EOM) for frequency shifting, replacing AOMs.
  • Validated the system through experimental measurements and Allan deviation analysis.

Main Results:

  • Achieved nanometric ranging precision with Allan deviation below 0.1 nm at 1 ms integration.
  • Successfully tracked high-frequency vibrations up to 100 kHz.
  • Demonstrated dynamic 3D surface imaging and nanoscale water surface vibration detection.
  • Maintained high precision across meter-level to nanometer-scale measurements.

Conclusions:

  • The AOM-free system offers superior phase coherence and precision compared to AOM-based systems.
  • The serrodyne-modulated EOM approach provides enhanced flexibility and reduced RF power consumption.
  • This versatile system is suitable for precision metrology and high-resolution sensing applications.