Design of a speed meter interferometer proof-of-principle experiment

Gräf, Christian; Barr, B.; Bell, A. S.; Campbell, Fraser A; Cumming, A.; Danilishin, S.; Gordon, Neil; Hammond, G.; Hennig, J.; Houston, E. A.; Huttner, S. H.; Jones, R.; Leavey, S.; Lück, H.; Macarthur, J.; Marwick, M.A.; Rigby, S. V.; Schilling, R.; Sorazu, B.; Spencer, A. P.; Steinlechner, S.; Strain, K. A.; Hild, S.

doi:10.1088/0264-9381/31/21/215009

Cited by 36 publications

(48 citation statements)

References 63 publications

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“…In this section, we calculate quantum noise limited sensitivity (or more accurately its spectral density) for an imbalanced Sagnac interferometer featuring arm cavities, as shown in figure 1. This layout is chosen for a reason that it replicates the main design features of a proof-of-concept speed meter interferometer under construction at the University of Glasgow [19]. The most profound deviation of this setup from a large scale GW interferometer is that it has parallel arms, while the latter has orthogonal ones.…”

Section: Analytical Analysis Of Quantum Noise In An Imperfect and Asymentioning

confidence: 99%

“…The Glasgow Sagnac speed meter aims to demonstrate the back action reduction of a speed meter compared to a Michelson interferometer with similar parameters. A detailed description of the experimental set up can be found in [19]. The most important parameters of this configuration are listed in the central column of table 1.…”

Section: Influence On the Performance Of A Small And A Large Scale Spmentioning

confidence: 99%

“…While there has been significant effort over the past ten years to study aspects of speed meter configurations from a theoretical point of view, so far the performance of the speed meter concept has not been demonstrated in an experiment. Therefore, we recently started to set up a Sagnac speed meter proof-of-concept experiment, that aims to demonstrate the reduction of back-action noise provided by the speed meter [19].…”

Section: Introductionmentioning

confidence: 99%

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Quantum noise of non-ideal Sagnac speed meter interferometer with asymmetries

et al. 2015

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The speed meter concept has been identified as a technique that can potentially provide laserinterferometric measurements at a sensitivity level which surpasses the standard quantum limit (SQL) over a broad frequency range. As with other sub-SQL measurement techniques, losses play a central role in speed meter interferometers and they ultimately determine the quantum noise limited sensitivity that can be achieved. So far in the literature, the quantum noise limited sensitivity has only been derived for lossless or lossy cases using certain approximations (for instance that the arm cavity round trip loss is small compared to the arm cavity mirror transmission). In this article we present a generalized, analytical treatment of losses in speed meters that allows accurate calculation of the quantum noise limited sensitivity of Sagnac speed meters with arm cavities. In addition, our analysis allows us to take into account potential imperfections in the interferometer such as an asymmetric beam splitter or differences of the reflectivities of the two arm cavity input mirrors. Finally, we use the examples of the proof-of-concept Sagnac speed meter currently under construction in Glasgow and a potential implementation of a Sagnac speed meter in the Einstein Telescope to illustrate how our findings affect Sagnac speed meters with metre-and kilometre-long baselines. IJ J J IJ J IJ J IJ J J IJ IJ J J J J J J J J J J J ( ) i , (A.5) J J J J ITM loss 2 2 2 ) J J J J J arm ITM ETM ITM ETM is an effective mass of the Jth arm with M J ITM and M 2 J ETM being the masses of ITM and ETM (note that there are two of them in each cavity), δ ω ω = − J J p is the Jth cavity resonance frequency, ω J , detuning from the pump laser frequency ω p , and the cavity half-bandwidths due to ITM power transmissivity, T J ITM , and due to loss, T J loss , read J J J r p J J IJ IJ J J signal . . signal¯a rm 2 IJ IJ IJ J J IJ J J IJ J IJ J IJ J J J IJ J J IJ J J J IJ J J IJ J J J J IJ IJ J J J J J J i . J J J J J J J J J

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Section: Analytical Analysis Of Quantum Noise In An Imperfect and Asymentioning

confidence: 99%

Section: Influence On the Performance Of A Small And A Large Scale Spmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Quantum noise of non-ideal Sagnac speed meter interferometer with asymmetries

et al. 2015

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“…Compared to other non-Gaussian beam profiles -like Mexican hat or flat-top profiles -the LG beams are compatible with spherical optics as currently in use. Additionally, novel readout schemes and topologies are currently under investigation to further reduce noises in the detectors [26].…”

Section: Detectors and Optical Layoutmentioning

confidence: 99%

The Einstein Telescope

Kroker¹,

Nawrodt²

2014

2014 IEEE Metrology for Aerospace (MetroAeroSpace)

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Interferometric gravitational wave detectors are amongst the most sensitive instruments ever built. They are hunting for tiny oscillations in space-time originating from cosmic events such as inspiraling objects or supernova explosions. These detectors are based on Michelson-like interferometers reaching sensitivities for lengths changes of better than 10 −18 m/ √ Hz.Currently, a second generation of gravitational wave detectors is under construction reducing relevant noise sources throughout their detection band by one order of magnitude. First steps towards a third generation detector -having two orders of magnitude larger sensitivity compared to the first generation -have been made. This gravitational wave observatory -the Einstein Telescope -is a European-wide effort leading to a sophisticated design including an optimum site selection. We present the status of these activities and give an overview of the state of the art technologies needed to realize such an instrument.

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“…All parameters are given in table 1. For comparison with the full noise budget of the Glasgow speed metre please refer to figure 2 in[31].…”

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confidence: 99%