scholarly journals Combined modulation to incident laser by subsurface crack and contaminant on fused silica

2018 ◽  
Author(s):  
Rongguang Liang ◽  
Hairong Wang ◽  
Zhi Chen ◽  
Jiuhong Wang ◽  
Huapan Xiao ◽  
...  
Keyword(s):  
Fused Silica ◽  
Subsurface Crack ◽  
Incident Laser

Effect of the repaired damage morphology of fused silica on the modulation of incident laser

2017 ◽  
Vol 64 ◽  
pp. 295-301 ◽  
Author(s):  
X. Gao ◽  
Y. Jiang ◽  
R. Qiu ◽  
Q. Zhou ◽  
R. Zuo ◽  
...  
Keyword(s):  
Fused Silica ◽  
Incident Laser ◽  
Damage Morphology

Incident laser modulation of a repaired damage site with a rim in fused silica rear subsurface

2012 ◽  
Vol 21 (4) ◽  
pp. 044212 ◽  
Author(s):  
Li Li ◽  
Xia Xiang ◽  
Xiao-Tao Zu ◽  
Xiao-Dong Yuan ◽  
Shao-Bo He ◽  
...  
Keyword(s):  
Fused Silica ◽  
Incident Laser ◽  
Damage Site ◽  
Laser Modulation

Modulation on incident laser induced by repaired subsurface defect in fused silica

2012 ◽  
Vol 24 (8) ◽  
pp. 1806-1810
Author(s):  
张彦垒 Zhang Yanlei ◽  
肖峻 Xiao Jun ◽  
袁晓东 Yuan Xiaodong ◽  
贺少勃 He Shaobo ◽  
蒋勇 Jiang Yong ◽  
...  
Keyword(s):  
Fused Silica ◽  
Incident Laser ◽  
Subsurface Defect

Numerical simulation of the modulation to incident laser by the repaired damage site in a fused silica subsurface

2011 ◽  
Vol 20 (7) ◽  
pp. 074209 ◽  
Author(s):  
Li Li ◽  
Xia Xiang ◽  
Xiao-Tao Zu ◽  
Hai-Jun Wang ◽  
Xiao-Dong Yuan ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Fused Silica ◽  
Incident Laser ◽  
Damage Site

scholarly journals Simulation of the Thermal Aberration of Fused Silica Reflective Optics Under High-power Laser Irradiation

2021 ◽  
Author(s):  
Yuan Li ◽  
HongMing Yu ◽  
XinQi Yin ◽  
Juan Wu ◽  
Feng Wang ◽  
...  
Keyword(s):  
High Power ◽  
Laser Power ◽  
Beam Quality ◽  
Spot Size ◽  
Fused Silica ◽  
Incident Power ◽  
High Power Laser ◽  
Incident Laser ◽  
Power Laser ◽  
Incident Laser Power

Abstract The output beam quality of high-power laser systems is limited by laser-induced thermal aberration of fused silica reflective optics. A numerical model for the simulation of thermal aberration was proposed and verified by the experimental results. Simulations on the thermal aberration of fused silica optics under 3~10 kW laser irradiation with laser beam diameters of 5 mm ~ 45 mm were carried out with the verified model. The simulation results showed that the peak-valley (PV) value of thermal aberration increases with increasing incident laser power under the same incident laser spot size and reduces with increasing incident laser spot size under the same incident laser power. There are the same PV values of thermal aberration under different incident power or power densities. An analytic formula of thermal aberration PV as a function of incident laser power and beam spot size was proposed. The analytic results are in good agreement with the simulations. With these conclusions, the thermal aberration of fused silica optics under high incident power and power density can be evaluated by that under low incident power and power density. It is helpful for the design of high-power laser systems to obtain reasonable output beam quality.

Numerical simulation of modulation to incident laser by submicron to micron surface contaminants on fused silica

2016 ◽  
Vol 25 (1) ◽  
pp. 014210 ◽  
Author(s):  
Liang Yang ◽  
Xia Xiang ◽  
Xin-Xiang Miao ◽  
Li Li ◽  
Xiao-Dong Yuan ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Fused Silica ◽  
Incident Laser ◽  
Surface Contaminants

Modulation of incident laser by the defect site with a contamination coating on fused silica surface

Optik ◽  
2013 ◽  
Vol 124 (13) ◽  
pp. 1637-1640 ◽  
Author(s):  
Li Li ◽  
Xia Xiang ◽  
Xiao-tao Zu ◽  
Xiao-dong Yuan ◽  
Shao-bo He ◽  
...  
Keyword(s):  
Silica Surface ◽  
Fused Silica ◽  
Incident Laser ◽  
Defect Site

SEM analysis of DC magnetron sputtered beryllium films

1988 ◽  
Vol 46 ◽  
pp. 960-961
Author(s):  
E. F. Lindsey ◽  
C. W. Price ◽  
E. L. Pierce ◽  
E. J. Hsieh
Keyword(s):  
Fine Structure ◽  
Electron Emission ◽  
Secondary Electron ◽  
Low Voltage ◽  
Ion Beam ◽  
Secondary Electron Emission ◽  
Sem Analysis ◽  
Fused Silica ◽  
Grain Structure ◽  
Silica Substrate

Columnar structures produced by DC magnetron sputtering can be altered by using RF biased sputtering or by exposing the film to nitrogen pulses during sputtering, and these techniques are being evaluated to refine the grain structure in sputtered beryllium films deposited on fused silica substrates. Beryllium is brittle, and fractures in sputtered beryllium films tend to be intergranular; therefore, a convenient technique to analyze grain structure in these films is to fracture the coated specimens and examine them in an SEM. However, fine structure in sputtered deposits is difficult to image in an SEM, and both the low density and the low secondary electron emission coefficient of beryllium seriously compound this problem. Secondary electron emission can be improved by coating beryllium with Au or Au-Pd, and coating also was required to overcome severe charging of the fused silica substrate even at low voltage. The coating structure can obliterate much of the fine structure in beryllium films, but reasonable results were obtained by using the high-resolution capability of an Hitachi S-800 SEM and either ion-beam coating with Au-Pd or carbon coating by thermal evaporation.

Investigation of fused silica dynamic behaviour

2006 ◽  
Vol 134 ◽  
pp. 929-934 ◽  
Author(s):  
F. Malaise ◽  
J.-M. Chevalier ◽  
I. Bertron ◽  
F. Malka
Keyword(s):  
Dynamic Behaviour ◽  
Fused Silica
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