Anomalous-dispersion enhanced active sagnac interferometry for gravitational wave detection

Selim M Shahriar*, M. Salit

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Scopus citations


In this paper, we study theoretically a zero-area Sagnac ring laser gravitational wave (GW) detector. We review first the zero-area Sagnac interferometer for GW detection, comparing its properties against the more conventional GW detector based on a Michaelson interferometer. We then describe a modified version of such a detector where the Sagnac interferometer is replaced by a zero-area Sagnac ring resonator fed by an external laser. This leads to the description of a GW detector based on an active, zero-area Sagnac ring resonator, where a gain medium is present inside the cavity. Finally, we show that if a medium with negative dispersion, which yields the so-called fast-light effect, is also present inside this detector, then its sensitivity to GW strain is enhanced by the inverse of the group index of the dispersive medium. We describe conditions under which this enhancement factor could be as large as 105.

Original languageEnglish (US)
Title of host publicationQuantum Electronics Metrology
StatePublished - Mar 24 2008
EventQuantum Electronics Metrology, QEM - San Jose, CA, United States
Duration: Jan 20 2008Jan 21 2008

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
ISSN (Print)0277-786X


OtherQuantum Electronics Metrology, QEM
Country/TerritoryUnited States
CitySan Jose, CA


  • Fast light
  • Gravitational wave detection
  • Sagnac resonator

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering


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