Mangano, V., van Veggel, A. , Douglas, R., Faller, J., Grant, A., Hough, J. and Rowan, S. (2017) Determination of the refractive index and thickness of a hydroxide-catalysis bond between fused silica from reflectivity measurements. Optics Express, 25(4), pp. 3196-3213. (doi: 10.1364/OE.25.003196) (PMID:28241536)
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Abstract
Hydroxide-catalysis bonding is a high precision jointing technique producing strong, transparent and thin bonds, the use of which in the delicate fused silica mirror suspensions of aLIGO have been instrumental in the first detections of gravitational radiation. More sensitive future gravitational wave detectors will require more accurate (ideally in situ) measurements of properties such as bond thickness. Here a non-destructive technique is presented in which the thickness and refractive index of a bond are determined from measurements of optical reflectivity. The reflectivity of a bond made between two fused silica discs using sodium silicate solution is less than 1⋅10−3 after 3 months. The thickness decreases to a constant value of around 140 nm at its minimum and the refractive index increases from 1.36 to 1.45. This proves that as well as determination of bond thickness in situ this bonding technique is highly interesting for optical applications.
| Item Type: | Articles |
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| Status: | Published |
| Refereed: | Yes |
| Glasgow Author(s) Enlighten ID: | Grant, Mr Alastair and van Veggel, Dr Marielle and Douglas, Miss Rebecca and Rowan, Professor Sheila and Mangano, Miss Valentina and Hough, Professor James |
| Authors: | Mangano, V., van Veggel, A., Douglas, R., Faller, J., Grant, A., Hough, J., and Rowan, S. |
| College/School: | College of Science and Engineering > School of Physics and Astronomy |
| Research Centre: | College of Science and Engineering > School of Physics and Astronomy > Institute for Gravitational Research |
| Journal Name: | Optics Express |
| Publisher: | Optical Society of America |
| ISSN: | 1094-4087 |
| ISSN (Online): | 1094-4087 |
| Published Online: | 07 February 2017 |
| Copyright Holders: | Copyright © 2017 Optics Express |
| First Published: | First published in Optics Express 25(4):3196-3213 |
| Publisher Policy: | Reproduced under a Creative Commons License |
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