• Physics of interferometric gravitational wave detectors

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      https://www.ias.ac.in/article/fulltext/pram/063/04/0645-0662

    • Keywords

       

      Interferometer; gravitational wave; Laser Interferometer Gravitational-wave Observatory

    • Abstract

       

      The Caltech-MIT joint LIGO project is operating three long-baseline interferometers (one of 2 km and two of 4 km) in order to unambiguously measure the infinitesimal displacements of isolated test masses which convey the signature of gravitational waves from astrophysical sources. An interferometric gravitational wave detector like LIGO is a complex, non-linear, coupled, dynamic system. This article summarizes various interesting design characteristics of these detectors and techniques that were implemented in order to reach and maintain its operating condition. Specifically, the following topics are discussed: (i) length sensing and control, (ii) alignment sensing and control and (iii) thermal lensing which changes the performance and operating point of the interferometer as the input power to LIGO is increased.

    • Author Affiliations

       

      Biplab Bhawal1

      1. LIGO Laboratory, California Institute of Technology, Pasadena, CA - 91125, USA
    • Dates

       
  • Pramana – Journal of Physics | News

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