Backward Lasing of Femtosecond Plasma Filaments
| Autor: | André Mysyrowicz, Yohann Brelet, Yi Liu, Pengji Ding, Aurélien Houard, Guillaume Point, Arnaud Couairon, Sergey Mitryukovskiy |
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| Přispěvatelé: | Interaction Laser-Matière (ILM), Laboratoire d'optique appliquée (LOA), École Nationale Supérieure de Techniques Avancées (ENSTA Paris)-École polytechnique (X)-Centre National de la Recherche Scientifique (CNRS)-École Nationale Supérieure de Techniques Avancées (ENSTA Paris)-École polytechnique (X)-Centre National de la Recherche Scientifique (CNRS), Centre de Physique Théorique [Palaiseau] (CPHT), Centre National de la Recherche Scientifique (CNRS)-École polytechnique (X), Kaoru Yamanouchi, Luis Roso, Ruxin Li, Deepak Mathur, Didier Normand |
| Rok vydání: | 2015 |
| Předmět: |
[PHYS.PHYS.PHYS-OPTICS]Physics [physics]/Physics [physics]/Optics [physics.optics]
Materials science Gain Plasma Laser pumping Population inversion Laser 01 natural sciences laser law.invention 010309 optics filament law 0103 physical sciences Femtosecond Stimulated emission Atomic physics 010306 general physics Lasing threshold plasma |
| Zdroj: | Progress in Ultrafast Intense Laser Science XII ISBN: 9783319236568 Springer Series in Chemical Physics Kaoru Yamanouchi; Luis Roso; Ruxin Li; Deepak Mathur; Didier Normand. Springer Series in Chemical Physics, 112, Springer International Publishing, pp.89-103, 2015, Progress in Ultrafast Intense Laser Science XII, ⟨10.1007/978-3-319-23657-5_5⟩ |
| DOI: | 10.1007/978-3-319-23657-5_5 |
| Popis: | International audience; Stimulated emissions in both backward and forward directions from a plasma filament in ambient air or pure nitrogen have been observed in recent years. In this article, we present our recent experimental results concerning the backward stimulated emission. We first demonstrate that backward stimulated emission from neutral N2 molecules can be effectively generated with a circularly polarized 800 nm femtosecond laser pulse in pure nitrogen. Then, we show that the presence of oxygen is detrimental to the laser gain. To further confirm the presence of population inversion, we send a counter-propagating seeding pulse into the plasma filament. This leads to an amplification of the seeding pulse by two orders of magnitude. The crucial role of pump laser polarization indicates that the inelastic collisions between the energetic electrons and the neutral N2 molecules are at the origin of population inversion between the relevant states. |
| Databáze: | OpenAIRE |
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