Spatiotemporal rogue events in optical multiple filamentation.

Phys Rev Lett

Max-Born-Institut, Max-Born-Straße 2A, 12489 Berlin, Germany and Optoelectronics Research Centre, Tampere University of Technology, 33101 Tampere, Finland.

Published: December 2013

The transient appearance of bright spots in the beam profile of optical filaments formed in xenon is experimentally investigated. Fluence profiles are recorded with high-speed optical cameras at the kilohertz repetition rate of the laser source. A statistical analysis reveals a thresholdlike appearance of heavy-tailed fluence distributions together with the transition from single to multiple filamentation. The multifilament scenario exhibits near-exponential probability density functions, with extreme events exceeding the significant wave height by more than a factor of 10. The extreme events are isolated in space and in time. The macroscopic origin of these experimentally observed heavy-tail statistics is shown to be local refractive index variations inside the nonlinear medium, induced by multiphoton absorption and subsequent plasma thermalization. Microscopically, mergers between filament strings appear to play a decisive role in the observed rogue wave statistics.

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http://dx.doi.org/10.1103/PhysRevLett.111.243903DOI Listing

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