scholarly journals Modeling the effect of nanosecond laser conditioning on the femtosecond laser-induced damage of optical films

2015 ◽  
Vol 23 (11) ◽  
pp. 14774 ◽  
Author(s):  
Zehan Li ◽  
Juan Du ◽  
Yuanan Zhao ◽  
Yueliang Wang ◽  
Yuxin Leng ◽  
...  
Keyword(s):  
Femtosecond Laser ◽  
Nanosecond Laser ◽  
Laser Conditioning ◽  
Optical Films ◽  
Laser Induced Damage

Effect of nanosecond laser pre-irradiation on the femtosecond laser-induced damage of Ta2O5/SiO2high reflector

2012 ◽  
Vol 51 (10) ◽  
pp. 1495 ◽  
Author(s):  
Shunli Chen ◽  
Yuan’an Zhao ◽  
Dawei Li ◽  
Hongbo He ◽  
Jianda Shao
Keyword(s):  
Femtosecond Laser ◽  
Nanosecond Laser ◽  
Laser Induced Damage

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.

scholarly journals Ultrafast electronic dymamics during femtosecond laser-induced damage in omnidirectional reflector

2005 ◽  
Vol 54 (10) ◽  
pp. 4736
Author(s):  
Sun Hai-Yi ◽  
Jia Tian-Qing ◽  
Li Xiao-Xi ◽  
Xu Shi-Zhen ◽  
Feng Dong-Hai ◽  
...  
Keyword(s):  
Femtosecond Laser ◽  
Laser Induced Damage

Experimental Investigation on Laser Pretreatment of Optical Films

2011 ◽  
Vol 189-193 ◽  
pp. 3713-3716
Author(s):  
Zhi Lin Xia
Keyword(s):  
Experimental Investigation ◽  
Energy Density ◽  
Pulse Width ◽  
Incidence Angle ◽  
Damage Threshold ◽  
Negative Influence ◽  
Damage Probability ◽  
Optical Films ◽  
Laser Induced Damage ◽  
K9 Glass

Optical films have been prepared on K9 glass by electronic beam evaporation. Parameters of S-polarized Nd: YAG laser used for pretreatment and damage tests are: wavelength is 355nm, pulse width is 8ns, and incidence angle is 33.75 degree. The results reflect that: the influence of laser pretreatment on laser induced damage threshold of films is uncertain. Laser pretreatment not always improve the laser induced damage threshold of films, and sometimes it will cause negative influence. As for damage probability, for a certain testing energy density, there is an energy density scope, pretreatment pulse with energy density in which can reduce the laser induced damage probability of films. The energy density of laser pretreatment pulse should be selected according to the serving conditions of films.

The ultrafast excitation processes in femtosecond laser-induced damage in dielectric omnidirectional reflectors

2006 ◽  
Vol 100 (2) ◽  
pp. 023103 ◽  
Author(s):  
T. Q. Jia ◽  
H. Y. Sun ◽  
X. X. Li ◽  
D. H. Feng ◽  
C. B. Li ◽  
...  
Keyword(s):  
Femtosecond Laser ◽  
Laser Induced Damage ◽  
Excitation Processes

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.

Experimental study on characteristics of nanosecond laser-induced damage on optical elements

2014 ◽  
Vol 12 (s2) ◽  
pp. S21409-321414
Author(s):  
Xianhua Yin Xianhua Yin ◽  
Yifei Zhuang Yifei Zhuang ◽  
Yan Zhang Yan Zhang ◽  
Guowen Zhang Guowen Zhang ◽  
Xingqiang Lu Xingqiang Lu ◽  
...  
Keyword(s):  
Experimental Study ◽  
Nanosecond Laser ◽  
Optical Elements ◽  
Laser Induced Damage
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