Over 4000 free audio and video lectures, seminars and teaching resources from Oxford University.
Skip to Content Skip to Navigation

Thank you for visiting! Please consider filling out our questionnaire. This will help us improve our service providing free educational media recorded from the University of Oxford. Many thanks!

Click here to access the survey (3 minutes to complete).

Spatio-temporal Optical Vortices

Loading Video...
Duration: 0:57:08 | Added: 27 Apr 2017
Physics Colloquium 10th March 2017 delivered by Professor Howard Milchberg, University of Maryland, USA

When an optical pulse propagating through a nonlinear medium exceeds a certain threshold power, it can focus itself and collapse, in theory, to a singularity. In practice, several physical mechanisms mitigate or arrest the catastrophic collapse and the pulse continues propagation as a filamentary structure. This scenario has played out in many nonlinear optics systems over decades: among them are air filamentation, relativistic self-focusing in plasmas, laser-material processing, and nonlinear generation of broadband light. Recently, we showed that self-focusing collapse and collapse arrest is universally accompanied by the generation of robust topological structures: spatio-temporal optical vortices (STOVs). I’ll describe our experiments and simulations leading to this result.

Oxford Unit:
Copy and paste this HTML snippet to embed the audio or video on your site: