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- Y Tanguy, T Ackemann, W J Firth, R Jäger
- Physical review letters
- 2008

The realization of a cavity soliton laser using a vertical-cavity surface-emitting semiconductor gain structure coupled to an external cavity with a frequency-selective element is reported. All-optical control of bistable solitonic emission states representing small microlasers is demonstrated by injection of an external beam. The control scheme is phase… (More)

- Joshua P Toomey, Deborah M Kane, Thorsten Ackemann
- Optics express
- 2014

Permutation entropy (PE) has a growing significance as a relative measure of complexity in nonlinear systems. It has been applied successfully to measuring complexity in nonlinear laser systems. Here, PE and weighted permutation entropy (WPE) are discovered to show an unexpected inversion to higher values, when characterizing the complexity at the… (More)

- P V Paulau, D Gomila, T Ackemann, N A Loiko, W J Firth
- Physical review. E, Statistical, nonlinear, and…
- 2008

In this paper, we analyze a model of broad area vertical-cavity surface-emitting lasers subjected to frequency-selective optical feedback. In particular, we analyze the spatio-temporal regimes arising above threshold and the existence and dynamical properties of cavity solitons. We build the bifurcation diagram of stationary self-localized states, finding… (More)

- T. Ackemann, N. Radwell, C. McIntyre, G. L. Oppo, W. J. Firth
- 2010 12th International Conference on Transparent…
- 2010

The dynamics of a broad-area vertical-cavity surface-emitting laser (VCSEL) with frequency-selective feedback supporting bistable spatial solitons is analyzed experimentally and theoretically. Self-pulsing is observed and indicates at least partial mode-locking of several external-cavity modes. It is argued that mode-locking of spatial solitons is an… (More)

- Etienne Averlant, Mustapha Tlidi, Hugo Thienpont, Thorsten Ackemann, Krassimir Panajotov
- Optics express
- 2014

We report experimental evidence of spontaneous formation of localized structures in a 80 μm diameter Vertical-Cavity Surface-Emitting Laser (VCSEL) biased above the lasing threshold and under optical injection. Such localized structures are bistable with the injected beam power and the VCSEL current. We experimentally investigate the formation of localized… (More)

- M Pesch, E Grosse Westhoff, T Ackemann, W Lange
- Physical review letters
- 2005

We report on the observation of a discrete family of spatial dissipative solitons in a simple optical pattern forming system, which is based on a modified single-mirror feedback arrangement. After a pitchfork bifurcation the system possesses two (nearly) equivalent coexisting states of different polarizations. The spatial solitons correspond to excursions… (More)

- T Ackemann, N Radwell, Y Noblet, R Jäger
- Optics letters
- 2012

We report on a simple method with a high spectral and spatial resolution for mapping variations in the cavity resonance of a plano-planar broad-area laser based on frequency-selective feedback. The demonstration experiment uses a vertical-cavity surface-emitting-laser (VCSEL), in which growth induced inhomogeneities are of particular importance. It relies… (More)

- P V Paulau, D Gomila, +4 authors W J Firth
- Optics express
- 2010

We report on the existence, stability and dynamical properties of two-dimensional self-localized vortices with azimuthal numbers up to 4 in a simple model for lasers with frequency-selective feedback.We build the full bifurcation diagram for vortex solutions and characterize the different dynamical regimes. The mathematical model used, which consists of a… (More)

Transverse pattern formation in an optical cavity containing a cloud of cold two-level atoms is discussed. We show that density modulation becomes the dominant mechanism as the atomic temperature is reduced. Indeed, for low but easily achievable temperatures the internal degrees of freedom of the atoms can be neglected, and the system is well described by… (More)

- E Tesio, G R M Robb, T Ackemann, W J Firth, G-L Oppo
- Physical review letters
- 2014

We investigate transverse symmetry-breaking instabilities emerging from the optomechanical coupling between light and the translational degrees of freedom of a collisionless, damping-free gas of cold, two-level atoms. We develop a kinetic theory that can also be mapped on to the case of an electron plasma under ponderomotive forces. A general criterion for… (More)