, Volume 63, Issue 4, pp 645–662 | Cite as

Physics of interferometric gravitational wave detectors

  • Biplab Bhawal


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.


Interferometer gravitational wave Laser Interferometer Gravitational-wave Observatory 


04.30.Nn 95.55.Ym 07.05.Tp 07.60.Ly 


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Copyright information

© Indian Academy of Sciences 2004

Authors and Affiliations

  • Biplab Bhawal
    • 1
  1. 1.LIGO LaboratoryCalifornia Institute of TechnologyPasadenaUSA

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