[Cnqo] Optics Division Seminar 23 July 2014

[Gian-Luca Oppo]

Dear friends,

sorry to have to self-organise this but the CNQO computers will be shut down for the week-end soon.

On Wednesday 23 July at 11:00 am in the SUPA room (8th floor) there will be an Optics Division Seminar:

Turbulent, spiral and rogue waves in coherent optical systems
Gian-Luca Oppo, Alison Yao and Christopher Gibson
Turbulence, vortices and rogue waves are typical of complex fluid dynamics. They can all be found, however, in nonlinear optical systems under the action of a coherent injection. Working on models of singly resonant optical parametric oscillators [1] and complex Ginzburg-Landau equations (used also to describe trapped Fermi gases) with injection we find two coexistent spatio-temporal regimes in 2D: one phase bounded [2] and one phase unbounded. Spatio-temporal rogue waves displaying heavily non-Gaussian probability density functions occur in the phase-unbounded regime. Their appearance is associated with defect-mediated turbulence where creation and annihilation of vortices (spiral waves) produce psychedelic patterns of the phase. Such turbulence is Miles away from stochastic superposition of random waves. Finally, we show that the finite size of the injection beams destabilises the phase-bounded regimes but leaves the phase-unbounded turbulence unaffected. We provide hints about possible experimental realisation, including optical injection in a large variety of broad-area lasers.
[1] G.-L. Oppo, A. M. Yao and D. Cuozzo, Phys. Rev A 88, 043813 (2013)
[2] P. Coullet and K. Emilsson, Physica A 188, 190 (1992); Physica D 61, 119 (1992)
Chers,

gian-luca

--
gian-luca oppo

Coordinator of the CNQO Group and the Optics Division
SUPA and Department of Physics, University of Strathclyde
Glasgow, G4 0NG, Scotland, U.K.
Tel : +44-(0)141-548-3761
Email: g.l.oppo at strath.ac.uk<mailto:g.l.oppo at strath.ac.uk>
Winner of the 2014 Most Enthusiastic Teacher Award of the

[cid:4E1CFCBB-F451-4B32-B2A8-BDE355DADF6A at strath.ac.uk]

-------------- next part --------------
A non-text attachment was scrubbed...
Name: STEA_Logo.jpg
Type: image/jpeg
Size: 16734 bytes
Desc: STEA_Logo.jpg
Url : http://phys.strath.ac.uk/pipermail/cnqo/attachments/20140717/bdd63663/attachment.jpg