Photonics Group (Photonics)
The Photonics Group has a long-standing and leading expertise
in the design and operation of state-of-the-art solid-state and semiconductor
lasers, especially VECSEL structures, optimized for high-power, ultra-narrow
bandwidth and/or ultra-fast applications. It has expertise in semiconductor
processing, characterization and mounting. This combines with expertise
in experimental nonlinear dynamics, transverse effects and solitons in
nonlinear optical systems of T. Ackemann including
1. dynamics and spatial mode structure of VCSELs,
2. operation of grating-tunable external cavity semiconductor lasers for
nonlinear spectroscopy and injection-locking experiments,
3. transverse pattern formation and dissipative solitons in single-mirror
feedback systems,
4. mode structure of nonlinear cavities,
5. nonlinear beam propagation.
Recent work was on polarisation dynamics of VCSELs, where Dr. Ackemann's
group found first strong evidence for the relevance of spin degree of
freedoms in polarization switching of VCSELs. In addition, strong indications
were found for the existence of spatial solitons in VCSELs with frequency-selective
feedback. His work includes the first experimental demonstration of robust
control and complex interaction behaviour of structures analogous to cavity
solitons, using dissipative spatial solitons in a nonlinear all-optical
feedback system based on an atomic sample.
| Key personnel: | Thorsten
Ackemann* Yann Tanguy* |
Visit
the Photonics website
Selected publications
| Contact: | Department of Physics John Anderson Building 107 Rottenrow Glasgow G4 0NG Scotland, U.K |
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