Formation and evolution of intense, post-filamentation, ionization-free low divergence beams |
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| Authors: | J-F Daigle O Kosareva T-J Wang S Yuan G Roy |
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| Institution: | a Centre d'Optique, Photonique et Laser (COPL) et Département de physique, de génie physique et d'optique, Université Laval, Québec, Québec, Canada, G1V 0A6b International Laser Center & Faculty of Physics, Lomonosov Moscow State University, Moscow, Russiac State Key Laboratory of Precision Spectroscopy, East China Normal University, Shanghai 200062, Chinad Defence Research and Development Canada-Valcartier, 2459 Pie-XI Blvd North, Québec, Québec, Canada, G3J 1X5 |
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| Abstract: | The mechanisms related to the formation and propagation of post-filamentation intense light channels were rigorously investigated experimentally and numerically. It was found that they originate from a hot spot formed by diffraction of the pulse energy reservoir onto the plasma. Once the hot spot was formed, a channel with intensity estimated at 0.5 TW/cm2 could maintain its diameter over several tens of meters such that air was not ionized, but the self-focusing produced was sufficiently high to balance linear diffraction. This propagation regime is of high interest to propagate high intensity laser pulses with limited losses. |
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| Keywords: | Filamentation Short pulses Air Self-focusing |
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