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Proceedings Paper

Optical characterisation of hydroxide catalysed bonds applied to phosphate glass
Author(s): Grégoire Lacaille; Valentina Mangano; Anna-Maria A. van Veggel; Christian J. Killow; Peter E. MacKay; Sheila Rowan; James Hough
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Paper Abstract

We apply the Hydroxide Catalysis Bonding (HCB) technique to phosphate glass and measure the reflectivity and Light Induced Damage Threshold (LITD) of the newly formed interface. HCB is a room temperature, high performing process which was designed for astronomical research glass assemblies and played a key role in the detection of gravitational waves, a breakthrough in contemporary science. The bonds have numerous assets including mechanical strength, stability, no outgassing and resistance to contamination which are of high interest in the precision optics industry. However only little research has been done on their optical properties and mostly on silica based materials. In this paper, we use HCB to bond phosphate glass at room temperature with the goal of designing composite components for solid state laser gain media. We change the solution parameters to identify how they influence the final properties of the bonds: the LIDT at 1535 nm in long pulse regime and the reflectivity at 532 nm are investigated. The measurement of the incidence dependent reflectance allows estimating the thickness and refractive index of the bond in a non destructive process. The best performing set of parameters yields a LIDT of 1.6 GW/cm2 (16 J/cm2) and a reflectivity below 0.03 % which makes it suitable for use in high power lasers. The bond thickness is derived both from Scanning Electron Microscopy and the reflectivity measurements and is in the range of 50-150 nm depending on the parameters. Finally, the bonds survive cutting and polishing which is promising for manufacturing purpose.

Paper Details

Date Published: 16 October 2017
PDF: 15 pages
Proc. SPIE 10448, Optifab 2017, 1044825 (16 October 2017); doi: 10.1117/12.2279693
Show Author Affiliations
Grégoire Lacaille, Gooch & Housego PLC (United Kingdom)
Univ. of Glasgow (United Kingdom)
Valentina Mangano, Univ. of Glasgow (United Kingdom)
Anna-Maria A. van Veggel, Univ. of Glasgow (United Kingdom)
Christian J. Killow, Univ. of Glasgow (United Kingdom)
Peter E. MacKay, Gooch & Housego PLC (United Kingdom)
Sheila Rowan, Univ. of Glasgow (United Kingdom)
James Hough, Univ. of Glasgow (United Kingdom)

Published in SPIE Proceedings Vol. 10448:
Optifab 2017
Julie L. Bentley; Sebastian Stoebenau, Editor(s)

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