Towards the SQL: Status of the direct thermal-noise measurements at the ANU

C. M. Mow-Lowry; S. Goßler; B. J.J. Slagmolen; J. Cumpston; M. B. Gray; D. E. McClelland

doi:10.1088/1742-6596/32/1/055

Towards the SQL: Status of the direct thermal-noise measurements at the ANU

C. M. Mow-Lowry^*, S. Goßler, B. J.J. Slagmolen, J. Cumpston, M. B. Gray, D. E. McClelland

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

3 Citations (Scopus)

Abstract

We present the preliminary results for an experiment that aims to perform direct measurements of suspension thermal noise. The experiment is based on a niobium flexure membrane approximately 200 νm thickness that is operated as a stable inverted pendulum. A 0.25 g mirror suspended by this flexure membrane is used as the end mirror of a Fabry-Perot test cavity. This test cavity has a length of 12mm and a finesse of about 800. It is mounted at the lowest stage of a quadruple cascaded pendulum suspension, enclosed in a high-vacuum envelope. The length of test cavity is stabilized with 1Hz bandwidth to a Nd:YAG laser, which itself is stabilized with high bandwidth to the length of a suspended Zerodur reference cavity of finesse 6000.

Original language	English
Pages (from-to)	362-367
Number of pages	6
Journal	Journal of Physics: Conference Series
Volume	32
Issue number	1
DOIs	https://doi.org/10.1088/1742-6596/32/1/055
Publication status	Published - 2 Mar 2006

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abstract = "We present the preliminary results for an experiment that aims to perform direct measurements of suspension thermal noise. The experiment is based on a niobium flexure membrane approximately 200 νm thickness that is operated as a stable inverted pendulum. A 0.25 g mirror suspended by this flexure membrane is used as the end mirror of a Fabry-Perot test cavity. This test cavity has a length of 12mm and a finesse of about 800. It is mounted at the lowest stage of a quadruple cascaded pendulum suspension, enclosed in a high-vacuum envelope. The length of test cavity is stabilized with 1Hz bandwidth to a Nd:YAG laser, which itself is stabilized with high bandwidth to the length of a suspended Zerodur reference cavity of finesse 6000.",

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Towards the SQL: Status of the direct thermal-noise measurements at the ANU

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