APL Photonics
(Nov 2019)
Lasing without population inversion in N2+
A. Mysyrowicz,
R. Danylo,
A. Houard,
V. Tikhonchuk,
X. Zhang,
Z. Fan,
Q. Liang,
S. Zhuang,
L. Yuan,
Y. Liu
Affiliations
A. Mysyrowicz
Laboratoire d’Optique Appliquée, ENSTA Paris, Ecole Polytechnique, CNRS, Institut Polytechnique de Paris, 828 Boulevard des Maréchaux, 91762 Palaiseau Cedex, France
R. Danylo
Laboratoire d’Optique Appliquée, ENSTA Paris, Ecole Polytechnique, CNRS, Institut Polytechnique de Paris, 828 Boulevard des Maréchaux, 91762 Palaiseau Cedex, France
A. Houard
Laboratoire d’Optique Appliquée, ENSTA Paris, Ecole Polytechnique, CNRS, Institut Polytechnique de Paris, 828 Boulevard des Maréchaux, 91762 Palaiseau Cedex, France
V. Tikhonchuk
Centre Lasers Intenses et Applications, University of Bordeaux-CNRS-CEA, 351 Cours de la Liberation, 33405 Talence Cedex, France
X. Zhang
Shanghai Key Lab of Modern Optical System, University of Shanghai for Science and Technology, 516, Jungong Road, 200093 Shanghai, China
Z. Fan
Shanghai Key Lab of Modern Optical System, University of Shanghai for Science and Technology, 516, Jungong Road, 200093 Shanghai, China
Q. Liang
Shanghai Key Lab of Modern Optical System, University of Shanghai for Science and Technology, 516, Jungong Road, 200093 Shanghai, China
S. Zhuang
Shanghai Key Lab of Modern Optical System, University of Shanghai for Science and Technology, 516, Jungong Road, 200093 Shanghai, China
L. Yuan
School of Physics and Astronomy, Shanghai Jiao Tong University, Shanghai 200240, China
Y. Liu
Laboratoire d’Optique Appliquée, ENSTA Paris, Ecole Polytechnique, CNRS, Institut Polytechnique de Paris, 828 Boulevard des Maréchaux, 91762 Palaiseau Cedex, France
DOI
https://doi.org/10.1063/1.5116898
Journal volume & issue
Vol. 4,
no. 11
Abstract
Read online
We experimentally demonstrate the existence of long-lived coherent polarizations coupling simultaneously ground state X (X2Σg+) to excited states A (A2Πu) and B (B2Σu+) of N2+ inside a plasma created by a short intense laser pulse at 800 nm. This three-level V-scheme arrangement is responsible for a strong optical gain without population inversion at the B–X transition at 391.4 nm. Simulations based on Maxwell-Bloch equations reproduce well the kinetics and the pressure dependence of the gain.
Published in APL Photonics
ISSN
2378-0967 (Online)
Publisher
AIP Publishing LLC
Country of publisher
United States
LCC subjects
Technology: Engineering (General). Civil engineering (General): Applied optics. Photonics
Website
https://aplphotonics.aip.org
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