Latest News

Spontaneous light-mediated magnetism in cold atoms

A new article was published in Communications Physics.

Oct 7, 2018
Spontaneous light-mediated magnetism in cold atoms
Mechanism behind the Cavity Soliton Laser
Feedback configuration The external cavity contains a two lens telescope, which is adjusted to infinity, i.e. the cavity is self-imaging and all transverse modes are degenerate. As a result, there is a 1:1 feedback for every point in the VCSEL onto itself.
Jan 1, 2018
Mechanism behind the Cavity Soliton Laser
Mechanism of Spatial Instability
A laser beam with an initially homogeneous phase and amplitude distribution is incident on a medium whose refractive index depends on the light intensity. If there is a fluctuation in the refractive index distribution of the medium, the transmitted wave will be phase-modulated.
Jan 1, 2018
Optical Pumping
Optical pumping denotes the redistribution of population within atomic multiplets by state-selective optical excitation in an electronically excited state and the subsequent spontaneous emission. In most cases the considered multiplets consist of Zeeman substates.
Jan 1, 2018
Self-organization
What is the reason that an initially homogeneous system evolves spontaneously into a modulated, “structured” state? This intriguing question arises in many sciences, in nature as well as in the laboratory.
Jan 1, 2018
Self-organization
Talbot Effect
The Talbot-effect is a near field ‘self-imaging’ effect generic for certain wave equations like the paraxial wave equation and the Schrödinger equation. Any spatial modulation of period Λ of a plane carrier wave is reproduced after the Talbot-length $z_R= 2Λ^2/λ$.
Jan 1, 2018
Talbot Effect
MSCA-ETN ColOpt funded.

Thorsten Ackemann coordinates MSCA-European Training Network ColOpt (Collective Effects and Optomechanics in Ultra-cold Matter)

Jan 1, 2017
MSCA-ETN ColOpt funded.
Observation of self-organized hexagons via optomechanically nonlinearities.

Observation of self-organized hexagons via optomechanically nonlinearities reported in Nature Photonics, see News Release and coverage in Optics & Photonics News.

Mar 23, 2014
Observation of self-organized hexagons via optomechanically nonlinearities.
Invited symposium talk at PQE

GR. M. Robb: Invited symposium talk at PQE - 44th Winter Colloquium on the Physics of Quantum Electronic (Jan 2014).

Mar 1, 2014
Invited symposium talk at PQE
Kinetic Theory for Transverse Optomechanical Instabilities

T. Ackemann hand an invited talk at the Sixth ‘Rio de la Plata’ Workshop on Lasers Dynamics and Nonlinear Photonics (Dec 2013).

Mar 1, 2014
Kinetic Theory for Transverse Optomechanical Instabilities