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High power and ultra-low-noise photodetector for squeezed-light enhanced gravitational wave detectors

Grote, Hartmut and Weinert, Michael and Adhikari, Rana X. and Affeldt, Christoph and Kringel, Volker and Leong, Jonathan and Lough, James and Lück, Harald and Schreiber, Emil and Strain, Kenneth A. and Vahlbruch, Henning and Wittel, Holger (2016) High power and ultra-low-noise photodetector for squeezed-light enhanced gravitational wave detectors. Optics Express, 24 (18). pp. 20107-20118. ISSN 1094-4087. doi:10.1364/OE.24.020107.

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Current laser-interferometric gravitational wave detectors employ a self-homodyne readout scheme where a comparatively large light power (5–50 mW) is detected per photosensitive element. For best sensitivity to gravitational waves, signal levels as low as the quantum shot noise have to be measured as accurately as possible. The electronic noise of the detection circuit can produce a relevant limit to this accuracy, in particular when squeezed states of light are used to reduce the quantum noise. We present a new electronic circuit design reducing the electronic noise of the photodetection circuit in the audio band. In the application of this circuit at the gravitational-wave detector GEO 600 the shot-noise to electronic noise ratio was permanently improved by a factor of more than 4 above 1 kHz, while the dynamic range was improved by a factor of 7. The noise equivalent photocurrent of the implemented photodetector and circuit is about 5 µA/√Hz above 1 kHz with a maximum detectable photocurrent of 20 mA. With the new circuit, the observed squeezing level in GEO 600 increased by 0.2 dB. The new circuit also creates headroom for higher laser power and more squeezing to be observed in the future in GEO 600 and is applicable to other optics experiments.

Item Type:Article
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Adhikari, Rana X.0000-0002-5731-5076
Additional Information:© 2016 Optical Society of America. Received 31 May 2016; revised 8 Jul 2016; accepted 9 Jul 2016; published 23 Aug 2016. Funding: Science and Technology Facilities Council (STFC) (ST/L000946/1), the University of Glasgow in the UK, the Bundesministerium für Bildung und Forschung (BMBF), the Volkswagen Stiftung, and the state of Lower Saxony in Germany. We thank W. Korth and V. Frolov for useful discussion on this topic. At the time of writing H. Grote is supported by LIGO laboratory. This document has been assigned LIGO Nr. P1500203.
Funding AgencyGrant Number
Science and Technology Facilities Council (STFC)ST/L000946/1
University of GlasgowUNSPECIFIED
Bundesministerium für Bildung und Forschung (BMBF)UNSPECIFIED
Volkswagen StiftungUNSPECIFIED
State of Lower SaxonyUNSPECIFIED
Other Numbering System:
Other Numbering System NameOther Numbering System ID
LIGO DocumentP1500203
Issue or Number:18
Classification Code:OCIS codes: (270.6570) Quantum optics, squeezed states; (120.3180) Instrumentation, interferometry; (230.5160) Optical devices, photodetectors; (000.2190) General, experimental physics
Record Number:CaltechAUTHORS:20161117-140729597
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Official Citation:Hartmut Grote, Michael Weinert, Rana X. Adhikari, Christoph Affeldt, Volker Kringel, Jonathan Leong, James Lough, Harald Lück, Emil Schreiber, Kenneth A. Strain, Henning Vahlbruch, and Holger Wittel, "High power and ultra-low-noise photodetector for squeezed-light enhanced gravitational wave detectors," Opt. Express 24, 20107-20118 (2016)
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:72140
Deposited By: George Porter
Deposited On:17 Nov 2016 22:22
Last Modified:11 Nov 2021 04:56

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