Silicate bonding of sapphire to SESAMs: adjustable thermal lensing for high-power lasers

Lang, L., Saltarelli, F., Lacaille, G., Rowan, S. , Hough, J. , Graumann, I. J., Phillips, C. R. and Keller, U. (2021) Silicate bonding of sapphire to SESAMs: adjustable thermal lensing for high-power lasers. Optics Express, 29(12), pp. 18059-18069. (doi: 10.1364/OE.427192)

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Abstract

Silicate bonding is a flexible bonding method that enables room-temperature bonding of many types of materials with only moderate flatness constraints. It is a promising approach for bonding components in high power laser systems, since it results in a thin and low-absorption interface layer between the bonded materials. Here we demonstrate for the first time silicate bonding of a sapphire window to a SEmiconductor Saturable Absorber Mirror (SESAM) and use the composite structure to mode-lock a high-power thin-disk laser. We characterize the fabricated devices both theoretically and experimentally and show how the thermally induced lens of the composite structure can be tuned both in magnitude and sign via the thickness of the sapphire window. We demonstrate mode-locking of a high-power thin-disk laser oscillator with these devices. The altered thermal lens allows us to increase the output power to 233 W, a 70-W-improvement compared to the results achieved with a state-of-the-art SESAM in the same cavity.

Item Type:Articles
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Rowan, Professor Sheila and Hough, Professor James and Lacaille, Mr Gregoire
Authors: Lang, L., Saltarelli, F., Lacaille, G., Rowan, S., Hough, J., Graumann, I. J., Phillips, C. R., and Keller, U.
Subjects:T Technology > T Technology (General)
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:25 May 2021
Copyright Holders:Copyright © 2021 The Authors
First Published:First published in Optics Express 29(12): 18059-18069
Publisher Policy:Reproduced under a Creative Commons License

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Project CodeAward NoProject NamePrincipal InvestigatorFunder's NameFunder RefLead Dept
173808Investigations in gravitational radiationSheila RowanScience and Technology Facilities Council (STFC)ST/N005422/1P&S - Physics & Astronomy
310743Investigations in Gravitational Radiation: 1-year extensionSheila RowanScience and Technology Facilities Council (STFC)ST/V001736/1P&S - Physics & Astronomy