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Amplification of intense light fields by ‘bound states of free electrons’

Authors :
Albrecht Lindinger
Timm Bredtmann
Sylvain Hermelin
Misha Ivanov
Mary Matthews
Jean-Pierre Wolf
Alexander Patas
Jérôme Kasparian
Julien Gateau
Maria Richter
Olga Smirnova
Felipe Morales
Source :
Publons
Publication Year :
2017
Publisher :
IEEE, 2017.

Abstract

Light is used to modify or control properties in many quantum systems, leading to phenomena such as electromagnetically induced transparency, the generation of slow light or bright coherent XUV radiation. Using light fields, with strengths comparable to the Coulomb field which binds valence electrons in atoms, particularly unusual quantum states can be created which describe a nearly free electron oscillating in the laser field yet still loosely bound to the core1, 2. We demonstrate that such states can arise not only in isolated atoms3, but also in gases at a few atmospheric pressures, guiding intense laser pulses, where they can act as a gain medium. This gain is created within just a few cycles of the guided field. Using shaped pulses4 with 5–10 fs risetimes, we create pulse conditions, within a laser filament, where these states can persist, and we observe in the corresponding emission, the signatures of these states. This work demonstrates a general, new, ultrafast gain mechanism during filamentation, in which any driven atom can achieve inversion intra-pulse, using pulse shaping techniques.

Details

Database :
OpenAIRE
Journal :
2017 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC)
Accession number :
edsair.doi.dedup.....78df659d55d09c2c0c81436cc38391a5
Full Text :
https://doi.org/10.1109/cleoe-eqec.2017.8086736