Frequency dependence of thermal noise in gram-scale cantilever flexures

Thanh T-H. Nguyen, Conor M. Mow-Lowry, Bram J. J. Slagmolen, John Miller, Adam J Mullavey, Stefan Goßler, Paul A. Altin, Daniel A. Shaddock, David E. McClelland

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)


We present measurements of the frequency dependence of thermal noise in aluminum and niobium flexures. Our measurements cover the audio-frequency band from 10 Hz to 10 kHz, which is of particular relevance to ground-based interferometric gravitational wave detectors, and span up to an order of magnitude above and below the fundamental flexure resonances. Results from two flexures are well explained by a simple model in which both structural and thermoelastic loss play a role. The ability of such a model to explain this interplay is important for investigations of quantum-radiation-pressure noise and the standard quantum limit. Furthermore, measurements on a third flexure provide evidence that surface damage can affect the frequency dependence of thermal noise in addition to reducing the quality factor, a result which will aid the understanding of how aging effects impact on thermal noise behavior.

Original languageEnglish
Article number112004
Number of pages7
JournalPhysical Review D
Issue number11
Publication statusPublished - 1 Dec 2015

ASJC Scopus subject areas

  • Nuclear and High Energy Physics


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