scholarly journals Enhancement of femtosecond laser-induced plasma fluorescence using a nanosecond laser

2019 ◽  
Vol 27 (4) ◽  
pp. 5755
Author(s):  
Xiaofeng Li ◽  
Bo Li ◽  
Jixu Liu ◽  
Zhifeng Zhu ◽  
Dayuan Zhang ◽  
...  
Keyword(s):  
Femtosecond Laser ◽  
Nanosecond Laser ◽  
Laser Induced Plasma

Nanosecond laser-induced breakdown assisted by femtosecond laser pre-ionization in air: the effect on spatial resolution and continuous radiation

2020 ◽  
Vol 92 (2) ◽  
pp. 20701
Author(s):  
Bo Li ◽  
Xiaofeng Li ◽  
Zhifeng Zhu ◽  
Qiang Gao
Keyword(s):  
Femtosecond Laser ◽  
Spatial Resolution ◽  
Laser Induced Breakdown Spectroscopy ◽  
Nanosecond Laser ◽  
Breakdown Threshold ◽  
Powerful Technique ◽  
Breakdown Spectroscopy ◽  
Continuous Radiation ◽  
Laser Induced Breakdown

Laser-induced breakdown spectroscopy (LIBS) is a powerful technique for quantitative diagnostics of gases. The spatial resolution of LIBS, however, is limited by the volume of plasma. Here femtosecond-nanosecond dual-pulsed LIBS was demonstrated. Using this method, the breakdown threshold was reduced by 80%, and decay of continuous radiation was shortened. In addition, the volume of the plasma was shrunk by 85% and hence, the spatial resolution of LIBS was significantly improved.

A comparison of nanosecond and femtosecond laser-induced plasma spectroscopy of brass samples

2000 ◽  
Vol 55 (11) ◽  
pp. 1771-1785 ◽  
Author(s):  
V Margetic ◽  
A Pakulev ◽  
A Stockhaus ◽  
M Bolshov ◽  
K Niemax ◽  
...  
Keyword(s):  
Femtosecond Laser ◽  
Plasma Spectroscopy ◽  
Laser Induced Plasma

Femtosecond-laser-induced plasma spectroscopy for high-pressure gas sensing: Enhanced stability of spectroscopic signal

2018 ◽  
Vol 113 (21) ◽  
pp. 214103 ◽  
Author(s):  
Paul S. Hsu ◽  
Anil K. Patnaik ◽  
Adam J. Stolt ◽  
Jordi Estevadeordal ◽  
Sukesh Roy ◽  
...  
Keyword(s):  
High Pressure ◽  
Femtosecond Laser ◽  
Gas Sensing ◽  
Plasma Spectroscopy ◽  
Laser Induced Plasma ◽  
Enhanced Stability

Development of High-Performance Polycrystalline CVD Diamond Coated Cutting Tool Edge With Femtosecond Laser

2020 ◽  
Author(s):  
Xiaoxu Liu ◽  
Kohei Natsume ◽  
Satoru Maegawa ◽  
Fumihiro Itoigawa
Keyword(s):  
Surface Modification ◽  
Femtosecond Laser ◽  
Pulse Laser ◽  
Laser Fluence ◽  
High Performance ◽  
Short Pulse ◽  
Cvd Diamond ◽  
Diamond Surface ◽  
Nanosecond Laser ◽  
Tool Edge

Abstract To realize the high performance of CVD diamond coated tools, a tool edge shaping process named pulse laser grinding (PLG) was developed with short pulse laser in our group previously. In this study, femtosecond laser was innovatively to be used to conduct the PLG process, since femtosecond laser is famous for its less thermal impact and some newly reported surface modification effect. The results show that PLG processing under high laser fluence of femtosecond laser could achieve roundness around 1 μm, which is similar to that of conventional PLG process with nanosecond laser, although the roughness of processed surface has been worse due to the redeposited debris. Furthermore, an interesting phenomenon has been confirmed again that under low laser fluence irradiation of femtosecond laser, the CVD diamond surface shows improved crystallinity of diamond structure. Based on this, a two-step tool edge processing method was proposed, which could realize the edge shaping and surface modification together with one laser processor. And the results show that the processed tool edge with much less edge roundness and surface roughness, and the tip part with better diamond crystallinity, indicating that sharper and hardness tool edge could be possibly to be realized with femtosecond laser.

Single-Shot Ptychographic Imaging of Femtosecond Laser Induced Plasma Dynamics

2020 ◽  
Author(s):  
Jonathan Barolak ◽  
David Goldberger ◽  
Charles Durfee ◽  
Daniel Adams
Keyword(s):  
Femtosecond Laser ◽  
Single Shot ◽  
Plasma Dynamics ◽  
Laser Induced Plasma

Image Enhancement and Luminance Analysis of Femtosecond Laser Induced Plasma Spot

2019 ◽  
Vol 46 (2) ◽  
pp. 0202001
Author(s):  
王福斌 Wang Fubin ◽  
刘洋 Liu Yang ◽  
潘兴辰 Pan Xingchen ◽  
王宜文 Wang Yiwen
Keyword(s):  
Femtosecond Laser ◽  
Image Enhancement ◽  
Laser Induced Plasma

Experimental study of the effects of femtosecond laser power on the induced-plasma geometry, supercontinuum white light generation and conical emission in air

2020 ◽  
Vol 34 (14) ◽  
pp. 2050152
Author(s):  
A. I. Sanny ◽  
W. M. Edmund Loh
Keyword(s):  
Femtosecond Laser ◽  
White Light ◽  
Laser Power ◽  
Forward Direction ◽  
Geometrical Shape ◽  
Laser Induced Plasma ◽  
Plasma Filament ◽  
White Light Generation ◽  
Conical Emission ◽  
Light Generation

This paper presents the experimental investigation of the changes in the geometrical shape of femtosecond laser-induced plasma in air under different laser power, and its effects on supercontinuum white light generation and conical emission. When a femtosecond laser is focused into a tiny spot in air, optical breakdown of air molecules occurs and this leads to the generation of plasma filament whose geometrical size and shape depend on laser power. This process is then followed by two light-emitting processes, namely supercontinuum white light generation and conical emission, both of which scatter light that reveals the characteristics of the plasma filament. Our experiment shows that the laser-induced plasma becomes thinner and longer at high average laser power but appears thick and round at lower laser power. At higher laser power, conical emission which scatters laser light in the forward direction dominates the scattering process while at lower laser power, it is the scattering of supercontinuum white light in all directions that plays a bigger role. The intricate rainbow-like pattern formed on a white screen located far away in the forward direction reveals sophisticated nonlinear optical processes that take place in conical emission which slowly diminishes as the laser power is gradually reduced.

Correlation between early-stage expansion and spectral emission of a nanosecond laser-induced plasma from organic material

2008 ◽  
Author(s):  
Matthieu Baudelet ◽  
Myriam Boueri ◽  
Jin Yu ◽  
Samuel S. Mao ◽  
Xianglei Mao ◽  
...  
Keyword(s):  
Organic Material ◽  
Early Stage ◽  
Nanosecond Laser ◽  
Spectral Emission ◽  
Laser Induced Plasma
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