Sapphire-based resonant waveguide-grating mirrors: advancing their intra-cavity power density capability
Sapphire-based resonant waveguide-grating mirrors: advancing their intra-cavity power density capability
We report on the design, fabrication, and implementation of a single-layer resonant waveguide-grating (RWG) mirror on a sapphire substrate. Our goal is to enhance these optics capability to withstand high intra-cavity power densities by exploiting the superior thermal properties of sapphire. The RWG was implemented as an intra-cavity folding mirror in an Yb:YAG thin-disk laser to generate linearly polarized and spectrally stabilized radiation. A linearly polarized output power of 191 W with an optical efficiency of 39% was obtained in multi-mode operation. This corresponds to a power density of 52 kW/cm2 on the RWG, for which the increase of its surface temperature was measured to be 12 K, which resulted in a 46-fold reduction of the surface temperature rise dependence on the intra-cavity power density with respect to what has been reported for a RWG on a fused silica substrate. In near fundamental-mode operation, a linearly polarized emission with an output power of 90 W, an optical efficiency of 30%, and a spectral bandwidth of 28 pm FWHM was obtained.
Bashir, Danish
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Boubekraoui, Ayoub
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Mourkioti, Georgia
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Li, Fangfang
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Karvinen, Petri
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Kuittinen, Markku
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Mackenzie, Jacob I.
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Graf, Thomas
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Ahmed, Marwan Abdou
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7 December 2023
Bashir, Danish
534a36c9-f44e-432e-8f62-7fef91a6c0ed
Boubekraoui, Ayoub
403339c3-b89b-4ece-a33a-59ea6809c818
Mourkioti, Georgia
fdbd699f-f21a-4e85-98bb-f961bd59b19f
Li, Fangfang
251ae15c-bba8-424c-be6d-8ed08eab976e
Karvinen, Petri
9e9ecd0b-45ec-49cd-80a5-593488403f84
Kuittinen, Markku
0a309ae3-b1b8-4e66-86df-be919346da88
Mackenzie, Jacob I.
1d82c826-fdbf-425b-ac04-be43ccf12008
Graf, Thomas
a8f9f5c7-fae6-459b-a970-2b8a25f412cb
Ahmed, Marwan Abdou
ea6f8609-ca30-46f0-96cf-709009811b95
Bashir, Danish, Boubekraoui, Ayoub, Mourkioti, Georgia, Li, Fangfang, Karvinen, Petri, Kuittinen, Markku, Mackenzie, Jacob I., Graf, Thomas and Ahmed, Marwan Abdou
(2023)
Sapphire-based resonant waveguide-grating mirrors: advancing their intra-cavity power density capability.
Applied Physics B, 130 (1), [4].
(doi:10.1007/s00340-023-08144-2).
Abstract
We report on the design, fabrication, and implementation of a single-layer resonant waveguide-grating (RWG) mirror on a sapphire substrate. Our goal is to enhance these optics capability to withstand high intra-cavity power densities by exploiting the superior thermal properties of sapphire. The RWG was implemented as an intra-cavity folding mirror in an Yb:YAG thin-disk laser to generate linearly polarized and spectrally stabilized radiation. A linearly polarized output power of 191 W with an optical efficiency of 39% was obtained in multi-mode operation. This corresponds to a power density of 52 kW/cm2 on the RWG, for which the increase of its surface temperature was measured to be 12 K, which resulted in a 46-fold reduction of the surface temperature rise dependence on the intra-cavity power density with respect to what has been reported for a RWG on a fused silica substrate. In near fundamental-mode operation, a linearly polarized emission with an output power of 90 W, an optical efficiency of 30%, and a spectral bandwidth of 28 pm FWHM was obtained.
Text
s00340-023-08144-2
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Accepted/In Press date: 13 November 2023
Published date: 7 December 2023
Additional Information:
Funding Information:
Open Access funding enabled and organized by Projekt DEAL. European Union's Horizon 2020 research and innovation programme under Marie Skłodowska-Curie (813159). JM also acknowledges the U.K. Engineering and Physical Sciences Research Council (EPSRC) for financial support via the grant EP/P027644/1. MK also acknowledges the financial support of the Academy of Finland through the flagship on “Photonics research and innovation” (PREIN, 320166).
Funding Information:
The authors thank Christof Pruss from the Institut für Technische Optik (ITO) for the support in the wavefronts deformations measurements.
Publisher Copyright:
© 2023, The Author(s).
Identifiers
Local EPrints ID: 486242
URI: http://eprints.soton.ac.uk/id/eprint/486242
ISSN: 0946-2171
PURE UUID: e7aab644-37d5-4114-836c-8f15e11b5f55
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Date deposited: 15 Jan 2024 17:54
Last modified: 06 Jun 2024 01:39
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Author:
Danish Bashir
Author:
Ayoub Boubekraoui
Author:
Georgia Mourkioti
Author:
Fangfang Li
Author:
Petri Karvinen
Author:
Markku Kuittinen
Author:
Jacob I. Mackenzie
Author:
Thomas Graf
Author:
Marwan Abdou Ahmed
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