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Detuned Twin-Signal-Recycling

Detuned Twin-Signal-Recycling. André Thüring , Christian Gräf, Henning Vahlbruch, Moritz Mehmet, Karsten Danzmann and Roman Schnabel. LVC-Meeting Amsterdam 2008. Chelkowski et al ., Phys. Rev. A 71, 013806 (2005)]. Harms et al ., Phys. Rev. D 68, 042001 (2003)].

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Detuned Twin-Signal-Recycling

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  1. Detuned Twin-Signal-Recycling André Thüring, Christian Gräf, Henning Vahlbruch, Moritz Mehmet, Karsten Danzmann and Roman Schnabel LVC-Meeting Amsterdam 2008

  2. Chelkowski et al., Phys. Rev. A 71, 013806 (2005)] Harms et al., Phys. Rev. D 68, 042001 (2003)] Vahlbruch et al., PRL 95, 211102 (2005) Demonstration of a Squeezed-Light-Enhanced Power- and Signal-Recycled Michelson Interferometer Generation and characterization of frequency dependent squeezed light Squeezing is fully compatible with single sideband tuned GWDs (GEO600 & Adv.LIGO) GWDs and Squeezed light

  3. Features of the three-mirror cavity • Resonance doublet • Splitting frequency determined by the coupling of the resonators • Upper and lower signal sideband can be enhanced simultaneously • Signal transfer function is increased by a factor of two • Rotation of the squeezing ellipse is „self-compensated“ • Less demanding requirements for squeezed field injection A. Thüring et al. Optics Letters, Vol. 32, Issue 8, pp. 985-987 Adding an additional mirror (TSRM) in the detection port forms a linear coupled three-mirror cavity Twin-Signal-Recycling Topology

  4. Phase quadrature Without squeezed input With squeezed input Twin-Signal-Recycling Topology Amplitude quadrature • Used Parameters: • Power in IFOs 10kW • GEO600: • 1200m SR-cavity • Rsr=0.99 • Single filter cavity • Twin-Signal-Recycling: • 2x 1200m coupled cavites • RC=0.997 for 1kHz • frequency splitting • RTSRM=0.963 leads to the • peak senitivty of GEO600 Without squeezed input GEO600 tuned to lower sideband TSR GEO600 tuned to upper sideband With squeezed input

  5. The Experiment

  6. Power-Recycling cavity Differential Michelson Signal-Recycling cavity Twin-Signal-Recycling cavity Interferometer length control • Fast facts • Two modulation frequencies 15MHz and ~125MHz • Mixed polarization allows for a decoupling of MI error signal • PRC and MI error signal almost perfectly decoupled from the other DOFs • SRC and TSRC error signals show strong coupling with PRC and MI • At least a linear independent control matrix was achieved

  7. Experimental Results • Measurement of the quantum-noise transfer function • Injection of squeezed states with fixed quadrature angle • Homodyne read-out with external LO • Investigation of noise spectra for several IFO-operation points • Rotation from squeezed to anti-squeezed quadrature observed for the non-optimum states • Optimum operation point shows the predicted cancellation of the quadrature rotation • Measurements and simulation are in a good agreement

  8. Conclusion • We have demonstrated a broadband noise reduction by a factor of up to 4dB • The experimental results are in good agreement with theory • The TSR-Topology is optimum if one wants to have peak sensitivities at a certain sideband frequency • Upper and lower sideband are recycled simultaneously • A factor of two compared to Signal-Recycling/RSE • Squeezing can be injected without filter-cavity yielding a broadband sensitivity enhancement

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