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Proceedings Paper

High precision measurement of optical absorption in low-OH fused silica at 2 micron
Author(s): Craig Ingram; Huy Tuong Cao; Sebastian Ng; Daniel D. Brown; David Ottaway; Peter Veitch; Adam Gambell; Nikita Simakov; Alexander Hemming
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Paper Abstract

The first detection of gravitational waves from a binary black hole inspiral by LIGO in September 2015 heralded the beginning of a new age in gravitational wave astronomy. The detection of a binary neutron inspiral in August 2017 and has now opened up a new era of multi-messenger astronomy. To increase the sensitivity of future gravitational wave detectors, a change to cryogenic silicon test masses and an increase in laser power may be required. Silicon is a compelling choice as it has high thermal conductivity at cryo- genic temperatures, which reduces temperature gradients generated by optical absorption. Additionally, at 123 K, its thermal expansion coefficient crosses zero. Thus, near this temperature, thermo-elastic distortion of the mirror surface should be drastically reduced, as would the effect of thermo-elastic noise due to thermodynamic temperature fluctuations. However, the adoption of silicon for the optical substrates would necessitate a shift of operating wavelength from 1064 nm to >1.3 μm where silicon is transparent. While potential wavelengths include ca. 1.55 μm and 2.0 μm, the longer wavelengths may be preferred due to lower scattering loss and coating absorption.

Paper Details

Date Published: 30 December 2019
PDF: 2 pages
Proc. SPIE 11200, AOS Australian Conference on Optical Fibre Technology (ACOFT) and Australian Conference on Optics, Lasers, and Spectroscopy (ACOLS) 2019, 1120031 (30 December 2019); doi: 10.1117/12.2539961
Show Author Affiliations
Craig Ingram, Univ. of Adelaide (Australia)
Huy Tuong Cao, Univ. of Adelaide (Australia)
Sebastian Ng, Univ. of Adelaide (Australia)
Daniel D. Brown, Univ. of Adelaide (Australia)
David Ottaway, Univ. of Adelaide (Australia)
Peter Veitch, Univ. of Adelaide (Australia)
Adam Gambell, DST Group (Australia)
Nikita Simakov, DST Group (Australia)
Alexander Hemming, DST Group (Australia)

Published in SPIE Proceedings Vol. 11200:
AOS Australian Conference on Optical Fibre Technology (ACOFT) and Australian Conference on Optics, Lasers, and Spectroscopy (ACOLS) 2019
Arnan Mitchell; Halina Rubinsztein-Dunlop, Editor(s)

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