Related Experiment Video
Updated: Sep 25, 2025
12:14
The Generation of Higher-order Laguerre-Gauss Optical Beams for High-precision Interferometry
Published on: August 12, 2013
22.0K
Piezo-deformable mirrors for active mode matching in advanced LIGO.
Optics Express
|April 27, 2022
Summary
Advanced LIGO detectors use squeezed light but face mode mismatch issues. A new deformable mirror actively corrects wavefront, improving sensitivity for future observations.
Area of Science:
- Gravitational-wave astronomy
- Quantum optics
- Optical engineering
Background:
- Laser Interferometer Gravitational-Wave Observatory (LIGO) detectors are limited by quantum noise.
- Squeezed states of light enhance detector sensitivity but are affected by mode mismatch.
- Current LIGO systems lack active mode mismatch mitigation.
Purpose of the Study:
- To introduce a novel deformable mirror for active wavefront control.
- To address the active mode-matching requirements for advanced LIGO.
- To enhance the sensitivity of gravitational-wave detection.
Main Methods:
- Development of a deformable mirror utilizing a piezoelectric transducer.
- Actuation on mirror curvature via an axisymmetric flexure.
- Characterization of mirror performance including operating range, bandwidth, and scattering.
Main Results:
- The deformable mirror offers an operating range of 120±8 mD in vacuum, with an additional 200 mD out of vacuum.
- Total deformation range from -65 mD to -385 mD is achievable.
- Measured actuator bandwidth is 6.8 Hz, with scattering into higher-order modes <0.2%.
Conclusions:
- The developed piezo-deformable mirrors satisfy advanced LIGO's stringent noise and vacuum requirements.
- These mirrors will be implemented in the upcoming O4 observing run.
- Active mode-matching control will improve the performance of squeezed light injection in LIGO.
