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Sheon S Y Chua1, Michael S Stefszky, Conor M Mow-Lowry

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We developed a dual-wavelength optical parametric oscillator to create squeezed light for gravitational-wave detectors. This system achieved significant shot noise reduction and demonstrated excellent backscattered light suppression, crucial for advanced interferometers.

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Area of Science:

  • Quantum optics
  • Gravitational-wave astronomy
  • Laser physics

Background:

  • Advanced gravitational-wave interferometers require highly sensitive detectors to observe cosmic events.
  • Quantum noise, particularly shot noise, limits the sensitivity of current interferometers.
  • Squeezed light generation is a promising technique to overcome these noise limitations.

Purpose of the Study:

  • To report on the performance of a dual-wavelength resonant, traveling-wave optical parametric oscillator (OPO).
  • To generate squeezed light for application in advanced gravitational-wave interferometers.
  • To evaluate the OPO's shot noise suppression and backscattered light characteristics.

Main Methods:

  • Utilized a dual-wavelength resonant, traveling-wave optical parametric oscillator.
  • Measured shot noise suppression across the detection band relevant to Advanced LIGO.
  • Quantified the duration of controlled squeezing.
  • Assessed intracavity and incident backscattered light suppression.

Main Results:

  • Achieved shot noise suppression of 8.6±0.8 dB across the Advanced LIGO detection band.
  • Demonstrated controlled squeezing over a period of 5900 seconds.
  • Exhibited excellent intracavity backscattered light suppression (47 dB) and incident backscattered light suppression (41 dB).

Conclusions:

  • The developed traveling-wave OPO effectively generates squeezed light with significant shot noise reduction.
  • The demonstrated backscattered light suppression is critical for the successful integration into advanced interferometers.
  • This technology advances the potential sensitivity and observational capabilities of gravitational-wave detectors.