Determination of the refractive index and thickness of a hydroxide-catalysis bond between fused silica from reflectivity measurements

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
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
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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Project CodeAward NoProject NamePrincipal InvestigatorFunder's NameFunder RefLead Dept
459312Investigations in Gravitational Radiation.Sheila RowanScience & Technologies Facilities Council (STFC)ST/I001085/1P&A - PHYSICS & ASTRONOMY
459313Investigations in Gravitational Radiation.Sheila RowanScience & Technologies Facilities Council (STFC)ST/J000361/1P&A - PHYSICS & ASTRONOMY
624341Investigations in Gravitational Radiation / Particle Astrophysics Capital equipmentSheila RowanScience & Technologies Facilities Council (STFC)ST/L000946/1S&E P&A - PHYSICS & ASTRONOMY
621211Delivering hydroxide catalysis bonding with impactAnna-Maria Van VeggelRoyal Society (ROYSOC)RG120367S&E P&A - PHYSICS & ASTRONOMY
599861Underexplored properties of hydroxide catalysis bondsAnna-Maria Van VeggelRoyal Society (ROYSOC)DH120021S&E P&A - PHYSICS & ASTRONOMY