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  Finite mass beam splitter in high power interferometers

Harms, J., Schnabel, R., & Danzmann, K. (2004). Finite mass beam splitter in high power interferometers. Physical Review D, 70(10): 102001. doi:10.1103/PhysRevD.70.102001.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0013-4FC5-A Version Permalink: http://hdl.handle.net/11858/00-001M-0000-0013-4FC6-8
Genre: Journal Article

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 Creators:
Harms, Jan1, 2, Author
Schnabel, Roman2, Author              
Danzmann, Karsten2, Author              
Affiliations:
1AEI-Hannover, MPI for Gravitational Physics, Max Planck Society, ou_24009              
2Laser Interferometry & Gravitational Wave Astronomy, AEI-Hannover, MPI for Gravitational Physics, Max Planck Society, ou_24010              

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 Abstract: The beam splitter in high-power interferometers is subject to significant radiation-pressure fluctuations. As a consequence, the phase relations which appear in the beam splitter coupling equations oscillate and phase modulation fields are generated which add to the reflected fields. In this paper, the transfer function of the various input fields impinging on the beam splitter from all four ports onto the output field is presented including radiation-pressure effects. We apply the general solution of the coupling equations to evaluate the input-output relations of the dual-recycled laser-interferometer topology of the gravitational-wave detector GEO 600 and the power-recycling, signal-extraction topology of advanced LIGO. We show that the input-output relation exhibits a bright-port dark-port coupling. This mechanism is responsible for bright port contributions to the noise density of the output field and technical laser noise is expected to decrease the interferometer’s sensitivity at low frequencies. It is shown quantitatively that the issue of technical laser noise is unimportant in this context if the interferometer contains arm cavities.

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 Dates: 2004-11
 Publication Status: Published in print
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Title: Physical Review D
  Alternative Title : Phys. Rev. D
Source Genre: Journal
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Pages: - Volume / Issue: 70 (10) Sequence Number: 102001 Start / End Page: - Identifier: -