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  Thermal Noise Reduction and Absorption Optimization via Multi-Material Coatings

Steinlechner, J., Martin, I. W., Hough, J., Krueger, C., Rowan, S., & Schnabel, R. (2015). Thermal Noise Reduction and Absorption Optimization via Multi-Material Coatings. Physical Review D, 042001. doi:10.1103/PhysRevD.91.042001.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0024-D330-A Version Permalink: http://hdl.handle.net/11858/00-001M-0000-0025-BFB3-1
Genre: Journal Article

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 Creators:
Steinlechner, Jessica, Author
Martin, Iain W., Author
Hough, Jim, Author
Krueger, Christoph, Author
Rowan, Sheila, Author
Schnabel, Roman1, Author              
Affiliations:
1Laser Interferometry & Gravitational Wave Astronomy, AEI-Hannover, MPI for Gravitational Physics, Max Planck Society, ou_24010              

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Free keywords: Physics, Optics, physics.optics
 Abstract: Future gravitational wave detectors (GWDs) such as Advanced LIGO upgrades and the Einstein Telescope are planned to operate at cryogenic temperatures using crystalline silicon (cSi) test-mass mirrors at an operation wavelength of 1550 nm. The reduction in temperature in principle provides a direct reduction in coating thermal noise, but the presently used coating stacks which are composed of silica (SiO2) and tantala (Ta2O5) show cryogenic loss peaks which results in less thermal noise improvement than might be expected. Due to low mechanical loss at low temperature amorphous silicon (aSi) is a very promising candidate material for dielectric mirror coatings and could replace Ta2O5. Unfortunately, such a aSi/SiO2 coating is not suitable for use in GWDs due to high optical absorption in aSi coatings. We explore the use of a three material based coating stack. In this multi-material design the low absorbing Ta2O5 in the outermost coating layers significantly reduces the incident light power, while aSi is used only in the lower bilayers to maintain low optical absorption. Such a coating design would enable a reduction of Brownian thermal noise by 25%. We show experimentally that an optical absorption of only (5.3 +/- 0.4)ppm at 1550 nm should be achievable.

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 Dates: 2014-11-122015
 Publication Status: Published in print
 Pages: -
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 Table of Contents: -
 Rev. Method: -
 Identifiers: arXiv: 1411.3150
DOI: 10.1103/PhysRevD.91.042001
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Title: Physical Review D
  Other : Phys. Rev. D.
Source Genre: Journal
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Publ. Info: Lancaster, Pa. : American Physical Society
Pages: - Volume / Issue: - Sequence Number: 042001 Start / End Page: - Identifier: ISSN: 0556-2821
CoNE: /journals/resource/111088197762258