Mode mixing and losses in misaligned microcavities
Mode mixing and losses in misaligned microcavities
We present a study on the optical losses of Fabry-Pérot cavities subject to realistic transverse mirror misalignment. We consider mirrors of the two most prevalent surface forms: idealised spherical depressions, and Gaussian profiles generated by laser ablation. We first describe the mode mixing phenomena seen in the spherical mirror case and compare to the frequently-used clipping model, observing close agreement in the predicted diffraction loss, but with the addition of protective mode mixing at transverse degeneracies. We then discuss the Gaussian mirror case, detailing how the varying surface curvature across the mirror leads to complex variations in round trip loss and mode profile. In light of the severe mode distortion and strongly elevated loss predicted for many cavity lengths and transverse alignments when using Gaussian mirrors, we suggest that the consequences of mirror surface profile are carefully considered when designing cavity experiments.
32619-32636
Hughes, William J.
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Doherty, T.H.
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Blackmore, J.A.
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Horak, P.
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Goodwin, J.F.
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15 September 2023
Hughes, William J.
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Doherty, T.H.
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Blackmore, J.A.
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Horak, P.
520489b5-ccc7-4d29-bb30-c1e36436ea03
Goodwin, J.F.
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Hughes, William J., Doherty, T.H., Blackmore, J.A., Horak, P. and Goodwin, J.F.
(2023)
Mode mixing and losses in misaligned microcavities.
Optics Express, 31 (20), .
(doi:10.1364/OE.496981).
Abstract
We present a study on the optical losses of Fabry-Pérot cavities subject to realistic transverse mirror misalignment. We consider mirrors of the two most prevalent surface forms: idealised spherical depressions, and Gaussian profiles generated by laser ablation. We first describe the mode mixing phenomena seen in the spherical mirror case and compare to the frequently-used clipping model, observing close agreement in the predicted diffraction loss, but with the addition of protective mode mixing at transverse degeneracies. We then discuss the Gaussian mirror case, detailing how the varying surface curvature across the mirror leads to complex variations in round trip loss and mode profile. In light of the severe mode distortion and strongly elevated loss predicted for many cavity lengths and transverse alignments when using Gaussian mirrors, we suggest that the consequences of mirror surface profile are carefully considered when designing cavity experiments.
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Submitted date: 21 June 2023
Accepted/In Press date: 11 August 2023
Published date: 15 September 2023
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© 2023 OSA - The Optical Society. All rights reserved.
Identifiers
Local EPrints ID: 482199
URI: http://eprints.soton.ac.uk/id/eprint/482199
ISSN: 1094-4087
PURE UUID: 4bc047d4-cd7e-489d-b0f5-08e81a4f788b
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Date deposited: 21 Sep 2023 16:34
Last modified: 18 Mar 2024 02:55
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Contributors
Author:
William J. Hughes
Author:
T.H. Doherty
Author:
J.A. Blackmore
Author:
J.F. Goodwin
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