Last update: June 17th, 2016
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Prof. Jean-Pierre WOLF
New article in Science Advances
Formation of new ice particles. This formation follows the explosion of an ice particle induced by a single incident laser pulse of 50-fs duration and an energy of 3.5 mJ.
«Laser vaporization of cirrus-like ice particles
with secondary ice multiplication»
We investigate the interaction of ultrashort laser filaments with individual 90-µm ice particles, representative of cirrus particles. The ice particles fragment under laser illumination. By monitoring the evolution of the corresponding ice/vapor system at up to 140,000 frames per second over 30 ms, we conclude that a shockwave vaporization supersaturates the neighboring region relative to ice, allowing the nucleation and growth of new ice particles, supported by laser-induced plasma photochemistry. This process constitutes the first direct observation of filament-induced secondary ice multiplication, a process that strongly modifies the particle size distribution and, thus, the albedo of typical cirrus clouds.
Reference: M. Matthews, F. Pomel, C. Wender, A. Kiselev., D. Duft, J. Kasparian, J.-P. Wolf and T. Leisner Sci. Adv. 2, (5), e150191, (2016) [DOI: 10.1126/sciadv.1501912]
New PhD positions available :
PHD in Laser FilamentationVisit our jobs page for more details
SECOND ERC GRANT !
Prof. Wolf, who was awarded an ERC Advanced Grant in 2011, is now awarded a ERC Proof of Concept grant (http://erc.europa.eu/erc-funded-projects). The project aims at further developing the BioBox, which successfully identified Pollens in the countryside and marine aerosol during the Planet Solar-Deepwater campaign, in order to detect and identify bacteria in air. The new system will then be tested in actual conditions, namely operation rooms and clean rooms for immunodeficient patients at the HUG (Hopital Universitaire de Geneve). This approach would provide a quantitative probability of detecting a specific pathogen (for instance multiple resistant bacteria such as MRSA) to the healthcare and safety personal