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Area of Science:

  • Astrophysics
  • Optical Metrology
  • Gravitational Wave Detection

Background:

  • The Laser Interferometer Space Antenna (LISA) mission requires precise metrology for space-based gravitational wave detection.
  • Verifying the performance of interferometric phase extraction (phasemeter) is critical for LISA's success.
  • Linearity and phase noise contributions of phasemeters need rigorous assessment.

Purpose of the Study:

  • To develop and characterize a stable optical bench for verifying phasemeter performance under LISA conditions.
  • To establish a method for probing phasemeter linearity and phase noise.
  • To assess the suitability of the developed system for a LISA metrology verification facility.

Main Methods:

  • Implementation of a hexagonal quasimonolithic optical bench.
  • Utilization of a three-signal test for phasemeter characterization.
  • Stability characterization down to picometer levels.

Main Results:

  • The optical bench demonstrated sufficient stability for picometer-level measurements.
  • A benchmark measurement of phasemeter performance under LISA conditions was successfully conducted.
  • The system proved effective for probing linearity and phase noise contributions.

Conclusions:

  • The developed hexagonal quasimonolithic optical bench is a stable platform for phasemeter verification.
  • This system is a strong candidate for the core of a LISA metrology verification facility.
  • The results contribute to ensuring the performance requirements for gravitational wave detection are met.