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Superradiant lasing in inhomogeneously broadened ensembles with spatially varying coupling

Main Authors: Bychek, Anna, Hotter, Christoph, Plankensteiner, David, Ritsch, Helmut
Format: Article Journal
Terbitan: , 2021
Subjects:
superradiant laser
superradiance
bad-cavity laser
cumulant expansion
inhomogeneous broadening
cavity dephasing
Online Access: https://zenodo.org/record/6019131
ctrlnum 6019131
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format Journal:Article
Journal
Journal:Journal
author Bychek, Anna
Hotter, Christoph
Plankensteiner, David
Ritsch, Helmut
title Superradiant lasing in inhomogeneously broadened ensembles with spatially varying coupling
publishDate 2021
topic superradiant laser
superradiance
bad-cavity laser
cumulant expansion
inhomogeneous broadening
cavity dephasing
url https://zenodo.org/record/6019131
contents 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.
id IOS16997.6019131
institution ZAIN Publications
institution_id 7213
institution_type library:special
library
library Cognizance Journal of Multidisciplinary Studies
library_id 5267
collection Cognizance Journal of Multidisciplinary Studies
repository_id 16997
subject_area Multidisciplinary
city Stockholm
province INTERNASIONAL
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repoId IOS16997
first_indexed 2022-06-06T05:03:55Z
last_indexed 2022-06-06T05:03:55Z
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Lihat Juga