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Related Experiment Video

Updated: May 25, 2026

The Generation of Higher-order Laguerre-Gauss Optical Beams for High-precision Interferometry
12:14

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Published on: August 12, 2013

Arm-length stabilisation for interferometric gravitational-wave detectors using frequency-doubled auxiliary lasers.

Adam J Mullavey1, Bram J J Slagmolen, John Miller

  • 1Centre for Gravitational Physics, The Australian National University, Canberra, ACT, 0200, Australia.

Optics Express
|January 26, 2012
PubMed
Summary

Advanced gravitational-wave interferometers face challenges with mirror motion. A new technique uses auxiliary lasers to pre-stabilize arm cavities, reducing noise and enabling successful lock acquisition.

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Last Updated: May 25, 2026

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Area of Science:

  • Physics
  • Astronomy
  • Optics

Background:

  • Residual motion in arm cavity mirrors is a major obstacle for advanced gravitational-wave interferometers.
  • Achieving stable lock acquisition is crucial for detecting faint gravitational waves.

Purpose of the Study:

  • To present a novel technique for overcoming residual mirror motion in gravitational-wave detectors.
  • To improve the precision and stability of arm cavity length control.

Main Methods:

  • Utilized auxiliary lasers operating at twice the fundamental measurement frequency.
  • Employed auxiliary lasers to pre-stabilize the lengths of arm cavities.
  • Implemented a system for transferring longitudinal control from auxiliary to measurement lasers.

Main Results:

  • Reduced apparent length noise in a 1.3 m Fabry-Perot cavity to 30 picometers root mean square (rms).
  • Demonstrated successful transfer of longitudinal control, essential for stable operation.

Conclusions:

  • The auxiliary laser technique effectively mitigates residual mirror motion.
  • This method significantly enhances the stability required for advanced gravitational-wave detection.