scholarly journals Experimental study on emission spectra of air plasma induced by femtosecond laser pulses

2011 ◽  
Vol 60 (8) ◽  
pp. 085205
Author(s):  
Zhu Zhu-Qing ◽  
Wang Xiao-Lei
Keyword(s):  
Experimental Study ◽  
Femtosecond Laser ◽  
Emission Spectra ◽  
Laser Pulses ◽  
Femtosecond Laser Pulses ◽  
Air Plasma

scholarly journals Intensity modulated terahertz vortex wave generation in air plasma by two-color femtosecond laser pulses

2019 ◽  
Vol 44 (15) ◽  
pp. 3889 ◽  
Author(s):  
Maksym Ivanov ◽  
Illia Thiele ◽  
Luc Bergé ◽  
Stefan Skupin ◽  
Danas Buožius ◽  
...  
Keyword(s):  
Femtosecond Laser ◽  
Laser Pulses ◽  
Wave Generation ◽  
Femtosecond Laser Pulses ◽  
Air Plasma ◽  
Intensity Modulated

scholarly journals Characteristics of micro air plasma produced by double femtosecond laser pulses

2012 ◽  
Vol 20 (3) ◽  
pp. 2528 ◽  
Author(s):  
Nan Zhang ◽  
Zehua Wu ◽  
Kuanhong Xu ◽  
Xiaonong Zhu
Keyword(s):  
Femtosecond Laser ◽  
Laser Pulses ◽  
Femtosecond Laser Pulses ◽  
Air Plasma

Determination of the temporal structure of femtosecond laser pulses by means of laser-induced air plasma

2013 ◽  
Vol 22 (5) ◽  
pp. 054209 ◽  
Author(s):  
Nan Zhang ◽  
Wen-Xia Bao ◽  
Jing-Hui Yang ◽  
Xiao-Nong Zhu
Keyword(s):  
Femtosecond Laser ◽  
Temporal Structure ◽  
Laser Pulses ◽  
Femtosecond Laser Pulses ◽  
Air Plasma

scholarly journals Structure-Mediated Excitation of Air Plasma and Silicon Plasma Expansion in Femtosecond Laser Pulses Ablation

Research ◽  
2018 ◽  
Vol 2018 ◽  
pp. 1-11 ◽  
Author(s):  
Qingsong Wang ◽  
Lan Jiang ◽  
Jingya Sun ◽  
Changji Pan ◽  
Weina Han ◽  
...  
Keyword(s):  
Femtosecond Laser ◽  
Femtosecond Laser Ablation ◽  
Longitudinal Direction ◽  
Laser Pulses ◽  
Femtosecond Laser Pulses ◽  
Pulse Number ◽  
Air Plasma ◽  
Laser Material ◽  
Anisotropic Expansion ◽  
Multiple Pulses

Femtosecond laser-induced surface structures upon multiple pulses irradiation are strongly correlated with the pulse number, which in turn significantly affects successive laser-material interactions. By recording the dynamics of femtosecond laser ablation of silicon using time-resolved shadowgraphy, here we present direct visualization of the excitation of air plasma induced by the reflected laser during the second pulse irradiation. The interaction of the air plasma and silicon plasma is found to enhance the shockwave expansion induced by silicon ablation in the longitudinal direction, showing anisotropic expansion dynamics in different directions. We further demonstrate the vanishing of air plasma as the pulse number increases because of the generation of a rough surface without light focusing ability. In the scenario, the interaction of air plasma and silicon plasma disappears; the expansion of the silicon plasma and shockwave restores its original characteristic that is dominated by the laser-material coupling. The results show that the excitation of air plasma and the laser-material coupling involved in laser-induced plasma and shockwave expansion are structure mediated and dependent on the pulse number, which is of fundamental importance for deep insight into the nature of laser-material interactions during multiple pulses ablation.

scholarly journals Characterization of X-ray radiation from solid Sn target irradiated by femtosecond laser pulses in the presence of air plasma sparks

2016 ◽  
Vol 34 (3) ◽  
pp. 533-538 ◽  
Author(s):  
A. Curcio ◽  
M. Anania ◽  
F.G. Bisesto ◽  
A. Faenov ◽  
M. Ferrario ◽  
...  
Keyword(s):  
Femtosecond Laser ◽  
Near Infrared ◽  
Laser Energy ◽  
Laser System ◽  
Laser Pulses ◽  
Femtosecond Laser Pulses ◽  
X Rays ◽  
Air Plasma ◽  
X Ray ◽  
Near Infrared Spectra

AbstractThe emission of X-rays from solid tin targets irradiated by low-energy (few mJ) femtosecond laser pulses propagated through air plasma sparks is investigated. The aim is that to better understand the X-ray emission mechanism and to show the possibility to produce proper radiation for spectroscopic and imaging applications with a table-top laser system. The utilization of a controlled ultrashort prepulse is found necessary to optimize the conversion efficiency of laser energy into Lα radiation. The optimum contrast between the main pulse and the controlled prepulse is found about 102. A correlation between the laser contrast value and the laser near-infrared spectra at the exit of the plasma spark is observed.

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