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Superradiant lasing in inhomogeneously broadened ensembles with spatially varying coupling
Background: Theoretical studies of superradiant lasing on optical clock transitions predict a superb frequency accuracy and precision closely tied to the bare atomic linewidth. Such a superradiant laser is also robust against cavity fluctuations when the spectral width of the lasing mode is much lar...
Autores principales: | , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
F1000 Research Limited
2021
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10446144/ https://www.ncbi.nlm.nih.gov/pubmed/37645148 http://dx.doi.org/10.12688/openreseurope.13781.2 |
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author | Bychek, Anna Hotter, Christoph Plankensteiner, David Ritsch, Helmut |
author_facet | Bychek, Anna Hotter, Christoph Plankensteiner, David Ritsch, Helmut |
author_sort | Bychek, Anna |
collection | PubMed |
description | Background: Theoretical studies of superradiant lasing on optical clock transitions predict a superb frequency accuracy and precision closely tied to the bare atomic linewidth. Such a superradiant laser is also robust against cavity fluctuations when the spectral width of the lasing mode is much larger than that of the atomic medium. Recent predictions suggest that this unique feature persists even for a hot and thus strongly broadened ensemble, provided the effective atom number is large enough. Methods: Here we use a second-order cumulant expansion approach to study the power, linewidth and lineshifts of such a superradiant laser as a function of the inhomogeneous width of the ensemble including variations of the spatial atom-field coupling within the resonator. Results: We present conditions on the atom numbers, the pump and coupling strengths required to reach the buildup of collective atomic coherence as well as scaling and limitations for the achievable laser linewidth. Conclusions: We show how sufficiently large numbers of atoms subject to strong optical pumping can induce synchronization of the atomic dipoles over a large bandwidth. This generates collective stimulated emission of light into the cavity mode leading to narrow-band laser emission at the average of the atomic frequency distribution. The linewidth is orders of magnitudes smaller than that of the cavity as well as the inhomogeneous gain broadening and exhibits reduced sensitivity to cavity frequency noise. |
format | Online Article Text |
id | pubmed-10446144 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2021 |
publisher | F1000 Research Limited |
record_format | MEDLINE/PubMed |
spelling | pubmed-104461442023-08-29 Superradiant lasing in inhomogeneously broadened ensembles with spatially varying coupling Bychek, Anna Hotter, Christoph Plankensteiner, David Ritsch, Helmut Open Res Eur Research Article Background: Theoretical studies of superradiant lasing on optical clock transitions predict a superb frequency accuracy and precision closely tied to the bare atomic linewidth. Such a superradiant laser is also robust against cavity fluctuations when the spectral width of the lasing mode is much larger than that of the atomic medium. Recent predictions suggest that this unique feature persists even for a hot and thus strongly broadened ensemble, provided the effective atom number is large enough. Methods: Here we use a second-order cumulant expansion approach to study the power, linewidth and lineshifts of such a superradiant laser as a function of the inhomogeneous width of the ensemble including variations of the spatial atom-field coupling within the resonator. Results: We present conditions on the atom numbers, the pump and coupling strengths required to reach the buildup of collective atomic coherence as well as scaling and limitations for the achievable laser linewidth. Conclusions: We show how sufficiently large numbers of atoms subject to strong optical pumping can induce synchronization of the atomic dipoles over a large bandwidth. This generates collective stimulated emission of light into the cavity mode leading to narrow-band laser emission at the average of the atomic frequency distribution. The linewidth is orders of magnitudes smaller than that of the cavity as well as the inhomogeneous gain broadening and exhibits reduced sensitivity to cavity frequency noise. F1000 Research Limited 2021-09-22 /pmc/articles/PMC10446144/ /pubmed/37645148 http://dx.doi.org/10.12688/openreseurope.13781.2 Text en Copyright: © 2021 Bychek A et al. https://creativecommons.org/licenses/by/4.0/This is an open access article distributed under the terms of the Creative Commons Attribution Licence, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. |
spellingShingle | Research Article Bychek, Anna Hotter, Christoph Plankensteiner, David Ritsch, Helmut Superradiant lasing in inhomogeneously broadened ensembles with spatially varying coupling |
title | Superradiant lasing in inhomogeneously broadened ensembles with spatially varying coupling |
title_full | Superradiant lasing in inhomogeneously broadened ensembles with spatially varying coupling |
title_fullStr | Superradiant lasing in inhomogeneously broadened ensembles with spatially varying coupling |
title_full_unstemmed | Superradiant lasing in inhomogeneously broadened ensembles with spatially varying coupling |
title_short | Superradiant lasing in inhomogeneously broadened ensembles with spatially varying coupling |
title_sort | superradiant lasing in inhomogeneously broadened ensembles with spatially varying coupling |
topic | Research Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10446144/ https://www.ncbi.nlm.nih.gov/pubmed/37645148 http://dx.doi.org/10.12688/openreseurope.13781.2 |
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