DC-readout of a signal-recycled gravitational wave detector

  title={DC-readout of a signal-recycled gravitational wave detector},
  author={Stefan Hild and Hartmut Grote and J{\'e}r{\^o}me Degallaix and Simon Chelkowski and Karsten Danzmann and Andreas Freise and Martin Hewitson and J. Hough and Harald L{\"u}ck and M. Prijatelj and Kenneth Strain and J. R. Smith and Benno Willke},
  journal={Classical and Quantum Gravity},
All first-generation large-scale gravitational wave detectors are operated at the dark fringe and use a heterodyne readout employing radio frequency (RF) modulation–demodulation techniques. However, the experience in the currently running interferometers reveals several problems connected with a heterodyne readout, of which phase noise of the RF modulation is the most serious one. A homodyne detection scheme (DC-readout), using the highly stabilized and filtered carrier light as a local… 

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dc readout experiment at the Caltech 40m prototype interferometer

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Linear projection of technical noise for interferometric gravitational-wave detectors

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Frequency domain interferometer simulation with higher-order spatial modes

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Frequency-domain interferometer simulation with higher-order spatial modes

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Nonstationary shot noise and its effect on the sensitivity of interferometers.

By taking into account the additional noise contribution from the modulated shot noise, the 3-dB discrepancy between the measured sensitivity of the Garching prototype detector and the theoretical shot-noise limit is reduced to about 1.5 dB.

Modulation, signal, and quantum noise in interferometers.

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It is seen that the mixing in of quantum noise from different modes of the vacuum can degrade the signal-to-noise ratio of a measurement in a variety of apparently different physical situations.

Adaptive thermal compensation of test masses in advanced LIGO

As the first generation of laser interferometric gravitational wave detectors nears operation, research and development has begun on increasing the sensitivity of the instrument while utilizing the