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Abstract
Broadband enhancement of the sensitivity of gravitational wave detectors can be achieved by the use of negative dispersion filters to create white light signal recycling cavities. This filter should have mechanical frequency of 300 kHz or higher and T/Qm∼6×10-10 K, in order to achieve appreciable sensitivity enhancement in the range of 1-2 kHz. This paper investigates the possibility of using optical dilution of GaAs/AlGaAs-coated Si and GaAs "cat-flap" micro-resonators to achieve such performance. We analyse the loss contributions to such resonators, particularly thermoelastic loss, suspension loss and acceleration loss. Sufficient reduction of thermoelastic loss is possible when operating near the zero thermal expansion point with temperature control of ∼1 K for both materials. Acceleration loss and suspension losses can be minimised in the frequency range 104-105 Hz, allowing Q-factors in the range 1011-1012, but these are reduced at the target 400 kHz frequency. Results are subject to assumptions regarding material losses. Fabrication techniques for creating GaAs and SiN x suspended silicon cat-flap resonators are presented.
Original language | English |
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Pages (from-to) | 2174-2180 |
Number of pages | 7 |
Journal | Physics Letters, Section A: General, Atomic and Solid State Physics |
Volume | 382 |
Issue number | 33 |
DOIs | |
Publication status | Published - 25 Aug 2018 |
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Dive into the research topics of 'Ultra-low dissipation resonators for improving the sensitivity of gravitational wave detectors'. Together they form a unique fingerprint.Projects
- 2 Finished
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Three-Mode Interactions and Optical Springs in High Power Cavities
Blair, D. (Investigator 01), Ju, L. (Investigator 02), Zhao, C. (Investigator 03), Munch, J. (Investigator 04), Whitcomb, S. (Investigator 05), Chen, Y. (Investigator 06), Gregory, H. (Investigator 07) & Gossler, S. (Investigator 08)
ARC Australian Research Council
1/01/12 → 31/12/14
Project: Research
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Engineering & Testing of Three Mode Opto Acoustic Parametric Amplifiers
Zhao, C. (Investigator 01), Ju, L. (Investigator 02), Heidmann, A. (Investigator 03) & Khalili, F. (Investigator 04)
ARC Australian Research Council
1/01/12 → 31/12/16
Project: Research