ABSTRACT
Cavityless lasing of air molecules pumped by intense ultrafast lasers has drawn much attention during past decade, in the field of ultrafast optics. Owing to the optical-resonator-free nature, the lasing effect can be produced in the sky, thus holding unique potential for optical remote sensing. In this talk, I will present an overview of our recent work, focusing on two kinds of air lasing action: the lasing of neutral nitrogen molecules and the lasing of singly-ionized nitrogen molecules. The main theme will cover the mechanism for the generation of the excited nitrogen molecules or ions, the nature of the air lasing emission, and the important role of coherences for the radiation. Cavityless lasing of air molecules pumped by intense ultrafast lasers has drawn much attention during past decade, in the field of ultrafast optics. Owing to the optical-resonator-free nature, the lasing effect can be produced in the sky, thus holding unique potential for optical remote sensing. In this talk, I will present an overview of our recent work, focusing on two kinds of air lasing action: the lasing of neutral nitrogen molecules and the lasing of singly-ionized nitrogen molecules. The main theme will cover the mechanism for the generation of the excited nitrogen molecules or ions, the nature of the air lasing emission, and the important role of coherences for the radiation.
BIOGRAPHY
Prof. Yi Liu is a full professor in the University of Shanghai for Science and Technology, China. He received his Ph. D. degree from Peking University in 2006. Afterward, he joined Ecole Polytechnique in France, as a postdoctoral scholar. After the three-year postdoctoral experience, he was appointed to be a permanent researcher of French scientific research center (CNRS), in Laboratoire d’Optique Appliquée until 2015. Since 2016, he has been a full professor of University of Shanghai for Science and Technology, China. His research interests focus on the interaction of intense femtosecond with gas molecules, and the secondary radiations from air plasma, including the air lasing effect, the Terahertz radiation from air plasma, and the nonlinear filamentary propagation of femtosecond lasers. He has authored and co-authored about 80 papers in peer-reviewed journals, with more than 10 PRLs and 1 Optica.
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