Spatial evolution of multiple filaments created in air by femtosecond laser pulses
Paunescu, Gabriela and Riede, Wolfgang and Spindler, Gerhard (2008) Spatial evolution of multiple filaments created in air by femtosecond laser pulses. In: DPG Tagung Kurzzeitphysik 2008 Darmstadt. DPG Tagung 2008, 2008-03-10 - 2008-03-14, Darmstadt.
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The spatial evolution of filaments in air was experimentally investigated and compared with theoretical calculations. We used a new method to visualize the multi-filamentary-pattern along the laser propagation axis. This technique allows for the accurate determination of number and relative position of filaments across the beam cross section. The experiments have been performed with a Ti:Sapphire chirped pulse amplification laser system. The laser operates at a center wavelength of 800 nm, with an energy per pulse up to 15 mJ and a repetition rate up to 100 Hz. The pulse duration was maintained 50 fs during the experiments. The corresponding peak power is 0.3 TW, which is about 100 times the critical power for self-focusing in air. The measurements are in good agreement with numerical simulations of the pulse propagation starting from the measured intensity profile right behind the laser. Our nonlinear propagation equation comprises diffraction and self-focusing due to the optical Kerr effect. The defocusing effect of plasma generated by tunnel/multiphoton ionization is taken into account.
|Document Type:||Conference or Workshop Item (Speech)|
|Title:||Spatial evolution of multiple filaments created in air by femtosecond laser pulses|
|Date:||13 March 2008|
|Journal or Publication Title:||DPG Tagung Kurzzeitphysik 2008 Darmstadt|
|In ISI Web of Science:||No|
|Keywords:||fs pulses, filamentation, multiple filaments|
|Event Title:||DPG Tagung 2008|
|Event Type:||national Conference|
|Event Dates:||2008-03-10 - 2008-03-14|
|HGF - Research field:||no assignement|
|HGF - Program:||Aeronautics|
|HGF - Program Themes:||L AR - Aircraft Research|
|DLR - Research area:||Aeronautics|
|DLR - Program:||L AR - Aircraft Research|
|DLR - Research theme (Project):||L - Laser Research and Technology|
|Institutes and Institutions:||Institute of Technical Physics|
|Deposited By:||Dr. Gabriela Paunescu|
|Deposited On:||03 Nov 2008|
|Last Modified:||27 Apr 2009 14:52|
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