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A simple high-sensitivity interferometric position sensor for test mass control on an advanced LIGO interferometer

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Abstract

A small Michelson interferometer has been configured as a tracking mirror displacement sensor in order to achieve both large dynamic range (2.1 mm) and excellent sensitivity \({\rm{(2x10}}^{--{\rm{14}}} {\rm{m/}}\sqrt {{\rm{Hz)}}} {\rm{ }}\) across a broad frequency range (6Hz–3 kHz). The interferometer is illuminated by a simple LED, uses broadband, non-polarising beamsplitters and contains no lensing optics. A DC-coupled balanced detector provides an error signal that is used to position the tracking mirror of the Michelson interferometer so as to maintain an interferometer operating position close to the centre of a particular fringe. The total interferometric sensor provides a small, simple and cost-effective means of achieving high-resolution displacement measurements.

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Authors and Affiliations

  1. Department of Physics, Australian National University, ACT, 0200, Australia

    Malcolm B. Gray, David E. McCLELLAND & Seiji Kawamura

  2. LIGO Project, California Institute of Technology, Pasadena, CA, 91125, USA

    Mark Barton

Authors
  1. Malcolm B. Gray
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  2. David E. McCLELLAND
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  3. Mark Barton
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  4. Seiji Kawamura
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Gray, M.B., McCLELLAND, D.E., Barton, M. et al. A simple high-sensitivity interferometric position sensor for test mass control on an advanced LIGO interferometer. Optical and Quantum Electronics 31, 571–582 (1999). https://doi.org/10.1023/A:1006991717589

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  • DOI: https://doi.org/10.1023/A:1006991717589

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