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Weak-Light Phase-Locking Time Delay Interferometry with Optical Frequency Combs.

Mingyang Xu1, Hanzhong Wu1,2, Yurong Liang1

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

Sensors (Basel, Switzerland)
|October 14, 2022
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Summary
This summary is machine-generated.

Future space-borne gravitational wave detectors will use a phase-locking scheme with optical frequency combs (OFCs). This simplifies data processing and reduces noise, enhancing signal-to-noise ratio (SNR) for gravitational wave detection.

Keywords:
optical frequency combtime delay interferometryweak-light phase-locking

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Area of Science:

  • Astrophysics
  • Optical Physics
  • Metrology

Background:

  • Space-borne gravitational wave (GW) detectors require high signal-to-noise ratios (SNRs) for sensitive measurements.
  • The optical transponder, or phase-locking, scheme is proposed for future missions to maintain SNR.
  • Time Delay Interferometry (TDI) combinations are crucial for data analysis in GW detection.

Purpose of the Study:

  • To analyze the phase-locking scheme in conjunction with optical frequency combs (OFCs) for space-borne GW detectors.
  • To investigate the transfer characteristics of noises, particularly weak-light phase-locking (WLPL) noise, within this scheme.
  • To assess the potential of OFCs to simplify data streams by synchronizing laser frequency and clock noise.

Main Methods:

  • Analysis of the phase-locking scheme in the context of space-borne GW detection.
  • Characterization of noise transfer functions, focusing on WLPL noise.
  • Evaluation of TDI combinations for noise reduction and data simplification.

Main Results:

  • The proposed phase-locking scheme with a shared laser simplifies TDI combinations.
  • Optical frequency combs (OFCs) effectively synchronize laser frequency and clock noise, simplifying data streams.
  • Specific TDI combinations can efficiently reduce WLPL noise.
  • The synergy between phase-locking and OFCs significantly simplifies post-processing.

Conclusions:

  • The combination of phase-locking and OFCs offers a promising approach for future space-borne GW detectors.
  • This integrated scheme enhances SNR and simplifies data analysis, overcoming challenges posed by WLPL noise.
  • The technology paves the way for more efficient and simplified gravitational wave data processing in space missions.