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Dr Steven Wrathmall's Outputs (15)

Modelling spectra of hot alkali vapour in the saturation regime (2025)
Journal Article
Häupl, D. R., Higgins, C. R., Pizzey, D., Briscoe, J. D., Wrathmall, S. A., Hughes, I. G., Löw, R., & Joly, N. Y. (2025). Modelling spectra of hot alkali vapour in the saturation regime. New Journal of Physics, 27, Article 033003. https://doi.org/10.1088/1367-2630/adb77c

Laser spectroscopy of hot atomic vapours has been studied extensively. Theoretical models that predict the absolute value of the electric susceptibility are crucial for optimising the design of photonic devices that use hot vapours, and for extractin... Read More about Modelling spectra of hot alkali vapour in the saturation regime.

CoOMBE: A suite of open-source programs for the integration of the optical Bloch equations and Maxwell-Bloch equations (2024)
Journal Article
Potvliege, R., & Wrathmall, S. (2025). CoOMBE: A suite of open-source programs for the integration of the optical Bloch equations and Maxwell-Bloch equations. Computer Physics Communications, 306, Article 109374. https://doi.org/10.1016/j.cpc.2024.109374

The programs described in this article and distributed with it aim (1) at integrating the optical Bloch equations governing the time evolution of the density matrix representing the quantum state of an atomic system driven by laser or microwave field... Read More about CoOMBE: A suite of open-source programs for the integration of the optical Bloch equations and Maxwell-Bloch equations.

Indirect measurement of atomic magneto-optical rotation via Hilbert transform (2024)
Journal Article
Briscoe, J. D., Pizzey, D., Wrathmall, S. A., & Hughes, I. G. (2024). Indirect measurement of atomic magneto-optical rotation via Hilbert transform. Journal of Physics B: Atomic, Molecular and Optical Physics, 57(17), 175401. https://doi.org/10.1088/1361-6455/ad5e24

The Kramers–Kronig relations are a pivotal foundation of linear optics and atomic physics, embedding a physical connection between the real and imaginary components of any causal response function. A mathematically equivalent, but simpler, approach i... Read More about Indirect measurement of atomic magneto-optical rotation via Hilbert transform.

Geographical modelling of language decline (2023)
Journal Article
Brown, D., & Wrathmall, S. (2023). Geographical modelling of language decline. Royal Society Open Science, 10(5), https://doi.org/10.1098/rsos.221045

Competition between languages affects the lives of people all over the globe, and a huge number of languages are at risk of extinction. In this work, statistical physics is applied to modelling the decline of one language in competition with another.... Read More about Geographical modelling of language decline.

Voigt transmission windows in optically thick atomic vapours: a method to create single-peaked line centre filters (2023)
Journal Article
Briscoe, J. D., Logue, F. D., Pizzey, D., Wrathmall, S. A., & Hughes, I. G. (2023). Voigt transmission windows in optically thick atomic vapours: a method to create single-peaked line centre filters. Journal of Physics B: Atomic, Molecular and Optical Physics, 56(10), Article 105403. https://doi.org/10.1088/1361-6455/acc49c

Cascading light through two thermal vapour cells has been shown to improve the performance of atomic filters that aim to maximise peak transmission over a minimised bandpass window. In this paper, we explore the atomic physics responsible for the ope... Read More about Voigt transmission windows in optically thick atomic vapours: a method to create single-peaked line centre filters.

Laser spectroscopy of hot atomic vapours: from ’scope to theoretical fit (2022)
Journal Article
Pizzey, D., Briscoe, J. D., Logue, F. D., Ponciano-Ojeda, F. S., Wrathmall, S. A., & Hughes, I. G. (2022). Laser spectroscopy of hot atomic vapours: from ’scope to theoretical fit. New Journal of Physics, 24, https://doi.org/10.1088/1367-2630/ac9cfe

The spectroscopy of hot atomic vapours is a hot topic. Many of the work-horse techniques of contemporary atomic physics were first demonstrated in hot vapours. Alkali-metal atomic vapours are ideal media for quantum-optics experiments as they combine... Read More about Laser spectroscopy of hot atomic vapours: from ’scope to theoretical fit.

Better magneto-optical filters with cascaded vapor cells (2022)
Journal Article
Logue, F. D., Briscoe, J. D., Pizzey, D., Wrathmall, S. A., & Hughes, I. G. (2022). Better magneto-optical filters with cascaded vapor cells. Optics Letters, 47(12), 2975-2978. https://doi.org/10.1364/ol.459291

Single-cell magneto-optical Faraday filters find great utility and are realized with either ‘wing’ or ‘line center’ spectral profiles. We show that cascading a second cell with independent axial (Faraday) or transverse (Voigt) magnetic field leads to... Read More about Better magneto-optical filters with cascaded vapor cells.

The Solar Activity Monitor Network – SAMNet (2022)
Journal Article
Erdélyi, R., Korsós, M. B., Huang, X., Yang, Y., Pizzey, D., Wrathmall, S. A., Hughes, I. G., Dyer, M. J., Dhillon, V. S., Belucz, B., Brajša, R., Chatterjee, P., Cheng, X., Deng, Y., Domínguez, S. V., Joya, R., Gömöry, P., Gyenge, N. G., Hanslmeier, A., Kucera, A., …Zuccarello, F. (2022). The Solar Activity Monitor Network – SAMNet. Journal of Space Weather and Space Climate, 12, Article 2. https://doi.org/10.1051/swsc/2021025

The Solar Activity Magnetic Monitor (SAMM) Network (SAMNet) is a future UK-led international network of ground-based solar telescope stations. SAMNet, at its full capacity, will continuously monitor the Sun’s intensity, magnetic, and Doppler velocity... Read More about The Solar Activity Monitor Network – SAMNet.

Quasisimultons in Thermal Atomic Vapors (2019)
Journal Article
Ogden, T. P., Whittaker, K., Keaveney, J., Wrathmall, S., Adams, C., & Potvliege, R. (2019). Quasisimultons in Thermal Atomic Vapors. Physical Review Letters, 123(24), Article 243604. https://doi.org/10.1103/physrevlett.123.243604

The propagation of two-color laser fields through optically thick atomic ensembles is studied. We demonstrate how the interaction between these two fields spawns the formation of copropagating, two-color solitonlike pulses akin to the simultons found... Read More about Quasisimultons in Thermal Atomic Vapors.

Optimized ultra-narrow atomic bandpass filters via magneto-optic rotation in an unconstrained geometry (2018)
Journal Article
Keaveney, J., Wrathmall, S. A., Adams, C. S., & Hughes, I. G. (2018). Optimized ultra-narrow atomic bandpass filters via magneto-optic rotation in an unconstrained geometry. Optics Letters, 43(17), 4272-4275. https://doi.org/10.1364/ol.43.004272

Atomic bandpass filters are widely used in a variety of applications, owing to their high peak transmission and narrow bandwidths. Much of the previous literature has used the Faraday effect to realize these filters, where an axial magnetic field is... Read More about Optimized ultra-narrow atomic bandpass filters via magneto-optic rotation in an unconstrained geometry.

Variational determination of approximate bright matter-wave soliton solutions in anisotropic traps (2012)
Journal Article
Billam, T., Wrathmall, S., & Gardiner, S. (2012). Variational determination of approximate bright matter-wave soliton solutions in anisotropic traps. Physical Review A, 85(1), Article 013627. https://doi.org/10.1103/physreva.85.013627

We consider the ground state of an attractively interacting atomic Bose-Einstein condensate in a prolate, cylindrically symmetric harmonic trap. If a true quasi-one-dimensional limit is realized, then for sufficiently weak axial trapping this ground... Read More about Variational determination of approximate bright matter-wave soliton solutions in anisotropic traps.