Piezo-deformable mirrors for active mode matching in advanced LIGO

Author:

Srivastava Varun1ORCID,Mansell Georgia123,Makarem Camille4,Noh Minkyun5ORCID,Abbott Richard4,Ballmer Stefan1,Billingsley GariLynn4,Brooks Aidan4ORCID,Cao Huy Tuong6ORCID,Fritschel Peter2,Griffith Don4,Jia Wenxuan2,Kasprzack Marie2,MacInnis Myron2,Ng Sebastian6ORCID,Sanchez Luis4,Torrie Calum4,Veitch Peter6ORCID,Matichard Fabrice2

Affiliation:

1. Syracuse University

2. Massachusetts Institute of Technology

3. LIGO Hanford Observatory

4. California Institute of Technology

5. The University of British Columbia

6. University of Adelaide

Abstract

The detectors of the laser interferometer gravitational-wave observatory (LIGO) are broadly limited by the quantum noise and rely on the injection of squeezed states of light to achieve their full sensitivity. Squeezing improvement is limited by mode mismatch between the elements of the squeezer and the interferometer. In the current LIGO detectors, there is no way to actively mitigate this mode mismatch. This paper presents a new deformable mirror for wavefront control that meets the active mode matching requirements of advanced LIGO. The active element is a piezo-electric transducer, which actuates on the radius of curvature of a 5 mm thick mirror via an axisymmetric flexure. The operating range of the deformable mirror is 120±8 mD in vacuum and an additional 200 mD adjustment range accessible out of vacuum. Combining the operating range and the adjustable static offset, it is possible to deform a flat mirror from −65 mD to −385 mD. The measured bandwidth of the actuator and driver electronics is 6.8 Hz. The scattering into higher-order modes is measured to be <0.2% over the nominal beam radius. These piezo-deformable mirrors meet the stringent noise and vacuum requirements of advanced LIGO and will be used for the next observing run (O4) to control the mode-matching between the squeezer and the interferometer.

Funder

Australian Research Council

National Science Foundation

Publisher

Optica Publishing Group

Subject

Atomic and Molecular Physics, and Optics

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