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The Doubly Resonant, Travelling-Wave Squeezed Light Source

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Quantum Enhancement of a 4 km Laser Interferometer Gravitational-Wave Detector

Part of the book series: Springer Theses ((Springer Theses))

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Abstract

Squeezed states applicable for enhancing gravitational-wave detectors is the driver behind the development of large squeezing magnitudes at audio-detection band frequencies. This chapter describes the squeezed light source that achieved a greater than 10 dB squeezing measurement across the audio gravitational-wave detection band (10 Hz–10 kHz). This squeezing level was generated using a doubly resonant, travelling-wave optical parametric oscillator (OPO) with a wedged nonlinear crystal, and controlled using a modified coherent sideband locking technique. This chapter presents the development and results of the doubly resonant, travelling-wave squeezed light source, grouped into four topics:

  1. 1.

    The features of the squeezed light source OPO and modified coherent sideband locking scheme are first presented. Sections 6.1 and 6.2 present the design choices and parameters of the OPO. Section 6.3 introduces the coherent sideband locking technique, followed by the changes implemented for the modified coherent sideband locking technique.

  2. 2.

    Various experiment parameters and properties that impact on the squeezing measurement are then presented. These are categorised into properties affecting squeezing magnitude measurement (Sect. 6.4), and properties affecting low frequency squeezing measurement (Sect. 6.5).

  3. 3.

    Upgrades of the squeezed light source resulting from the understanding of the above properties are then detailed in Sect. 6.6. The upgraded squeezed light source configuration is presented in Sect. 6.7.

  4. 4.

    Lastly, the results of measurements from the squeezer are presented and characterised in Sect. 6.8. This includes the first measurement of greater than 10 dB squeezing across the audio gravitational-wave detection band (\(11.6\pm 0.4\) dB above 200 Hz), and 5900 s of continuously controlled squeezing.

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Notes

  1. 1.

    From Eq. 9 of [16], \(A\) is calculated as \(A=\frac{1-g}{1+g}\).

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Authors and Affiliations

  1. Laboratoire Kastler Brossel, Université Pierre et Marie Curie, Paris, France

    Sheon S. Y. Chua

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Correspondence to Sheon S. Y. Chua .

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Chua, S.S.Y. (2015). The Doubly Resonant, Travelling-Wave Squeezed Light Source. In: Quantum Enhancement of a 4 km Laser Interferometer Gravitational-Wave Detector. Springer Theses. Springer, Cham. https://doi.org/10.1007/978-3-319-17686-4_6

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