Design and fabrication of fused silica grating with shallow groove for energy measurement of high-energy pulse laser

2010 ◽  
Author(s):  
Chaoming Li ◽  
Xinrong Chen ◽  
Jianhong Wu ◽  
Quan Liu ◽  
Zuyuan Hu
Keyword(s):  
Pulse Laser ◽  
High Energy ◽  
Fused Silica ◽  
Energy Measurement ◽  
Energy Pulse ◽  
Shallow Groove

Surface Micropatterning of Pure Titanium for Biomedical Applications Via High Energy Pulse Laser Peening

2015 ◽  
Vol 3 (1) ◽  
Author(s):  
Ninggang Shen ◽  
Hongtao Ding ◽  
Robert Bowers ◽  
Yin Yu ◽  
Chelsey N. Pence ◽  
...  
Keyword(s):  
Shock Wave ◽  
Mechanical Strength ◽  
Pulse Laser ◽  
Biomedical Applications ◽  
Pure Titanium ◽  
Strong Shock ◽  
High Energy ◽  
Laser Peening ◽  
Biomedical Implant ◽  
Energy Pulse

Pure titanium is an ideal material for biomedical implant applications for its superior biocompatibility, but it lacks of the mechanical strength required in these applications compared with titanium alloys. This research is concerned with an innovative laser peening-based material process to improve the mechanical strength and cell attachment property of pure titanium in biomedical applications. Evidence has shown that engineered surface with unsmooth topologies will contribute to the osteoblast differentiation in human mesenchymal pre-osteoblastic cells, which is helpful to avoid long-term peri-abutment inflammation issues for the dental implant therapy with transcutaneous devices. However, surface quality is difficult to control or mechanical strength is not enhanced using conventional approaches. In this paper, a novel high energy pulse laser peening (HEPLP) process is proposed to both improve the mechanical strength and introduce a micropattern into the biomedical implant material of a commercially pure Titanium (cpTi). The strong shock wave generated by HEPLP presses a stainless steel grid, used as a stamp, on cpTi foils to imprint a micropattern. To understand the basic science during the process, the HEPLP induced shock wave pressure profile and history are modeled by a multiphysics hydrodynamic numerical analysis. The micropatterns and strength enhancement are then simulated using a dislocation density-based finite element (FE) framework. Finally, cell culture tests are conducted to investigate the biomedical performance of the patterned surface.

scholarly journals Dissipative soliton resonance as a guideline for high-energy pulse laser oscillators

2010 ◽  
Vol 27 (11) ◽  
pp. 2336 ◽  
Author(s):  
Philippe Grelu ◽  
Wonkeun Chang ◽  
Adrian Ankiewicz ◽  
Jose M. Soto-Crespo ◽  
Nail Akhmediev
Keyword(s):  
Pulse Laser ◽  
High Energy ◽  
Dissipative Soliton ◽  
Soliton Resonance ◽  
Laser Oscillators ◽  
Energy Pulse

scholarly journals A Study of the Characteristics of Plasma Generated by Infrared Pulse Laser-Induced Fused Silica

Crystals ◽  
2021 ◽  
Vol 11 (8) ◽  
pp. 1009
Author(s):  
Lixue Wang ◽  
Xudong Sun ◽  
Congrui Geng ◽  
Zequn Zhang ◽  
Jixing Cai
Keyword(s):  
Pulse Laser ◽  
Pulse Width ◽  
Laser Energy ◽  
High Energy ◽  
Fused Silica ◽  
Expansion Velocity ◽  
Generation Process ◽  
Experimental Conditions ◽  
Maximum Expansion ◽  
Laser Induced Plasma

When high energy infrared laser pulses are incident on fused silica, the surface of the fused silica is damaged and a laser-induced plasma is produced. Based on the theory of fluid mechanics and gas dynamics, a two-dimensional axisymmetric gas dynamic model was established to simulate the plasma generation process of fused silica induced by a millisecond pulse laser. The results show that the temperature of the central region irradiated by the laser is the highest, and the plasma is first produced in this region. When the laser energy density is 1.0 × 104 J/cm2 and the pulse width is 0.2 ms, the maximum expansion velocity of the laser-induced plasma is 17.7 m/s. Under the same experimental conditions, the results of the simulation and experiment are in good agreement. With an increase in pulse width, the plasma expansion rate gradually decreases.

Surface Micro-Scale Patterning for Biomedical Implant Material of Pure Titanium via High Energy Pulse Laser Peening

2014 ◽  
Author(s):  
Ninggang Shen ◽  
Chelsey N. Pence ◽  
Robert Bowers ◽  
Yin Yu ◽  
Hongtao Ding ◽  
...  
Keyword(s):  
Shock Wave ◽  
Dental Implant ◽  
Pulse Laser ◽  
Pure Titanium ◽  
Strong Shock ◽  
High Energy ◽  
Laser Peening ◽  
Implant Surface ◽  
Implant Material ◽  
Energy Pulse

Pure titanium (commercial pure cpTi) is an ideal dental implant material without the leeching of toxic alloy elements. Evidence has shown that unsmooth implant surface topologies may contribute to the osteoblast differentiation in human mesenchymal pre-osteoblastic cells, which is helpful to avoid long-term peri-abutment inflammation issues for the dental implant therapy with transcutaneous devices. Studies have been conducted on the grit blasted, acid etched, or uni-directional grooved Ti surface. However, for these existing approaches, the surface quality is difficult to control or may even damage the implant. A novel idea has been studied in which more complex two-dimensional (2D) patterns can be imprinted into the dental implant material of cpTi by high energy pulse laser peening (HEPLP). The strong shock wave generated by HEPLP press a stainless steel grid, used as a stamp, on Ti foils to imprint a 2D pattern. In this study, the multiple grid patterns and grid sizes were applied to test the cell’s favor. The HEPLP induced shock wave pressure profile and history were simulated by a 2D multi-physics hydrodynamic numerical analysis for a better understanding of this technique. Then, the cell culture tests were conducted with the patterned surface to investigate the contribution of these 2D patterns, with the control tests of the other existing implant surface topography forming approaches.

Microstructure and Property of Fe-Based Alloy Modified Layer on 304 Stainless Steel by High-Energy Pulse Laser-Like Cladding (HPLC)

2016 ◽  
Vol 879 ◽  
pp. 2255-2260 ◽  
Author(s):  
C.H. Zhang ◽  
Y.F. Jia ◽  
M. Guan ◽  
C.L. Wu ◽  
J.Z. Tan ◽  
...  
Keyword(s):  
Stainless Steel ◽  
Pulse Laser ◽  
Cavitation Erosion ◽  
Erosion Resistance ◽  
High Energy ◽  
Wear Testing ◽  
304 Stainless Steel ◽  
Energy Pulse ◽  
Modified Layer ◽  
Cavitation Erosion Resistance

Fe-based alloy modified layers were prepared on 304 stainless steels by high-energy pulse laser-like cold welding cladding technique. The microstructure, composition and phase constituents of the cladding layers were analyzed using SEM, EDS and XRD, respectively. The microhardness, friction-wear and cavitation erosion resistance were also investigated using microhardness tester, pin-on-disk wear-testing machine and ultrasonic vibrator. Experimental results showed that Fe-based alloy modified layer was mainly composed of α-Fe matrix phase and skeleton-like Cr23C6, Cr7C3 carbide reinforced phase, which was dispersively distributed into α-Fe matrix. The microhardness and friction coefficients of Fe-based alloy modified layer were 600HV and 0.4, respectively, indicating an improved wear resistance. The weight loss rate and average erosion depth of the modified layer was 1/5 and 1/10 that of 304 stainless steel in 3.5% NaCl solution after 5-h cavitation erosion test, respectively. The erosion crater depth of the modified layer was uniform, indicating that the cavitation erosion resistance of the modified layer was much better than that of the 304 stainless steel.

scholarly journals Influence of bulk defects on bulk damage performance of fused silica optics at 355 nm nanosecond pulse laser

2017 ◽  
Vol 25 (26) ◽  
pp. 33416 ◽  
Author(s):  
Jin Huang ◽  
Hongjie Liu ◽  
Fengrui Wang ◽  
Xin Ye ◽  
Laixi Sun ◽  
...  
Keyword(s):  
Pulse Laser ◽  
Fused Silica ◽  
Nanosecond Pulse ◽  
Nanosecond Pulse Laser

scholarly journals Adaptive pulse compression for transform-limited 15-fs high-energy pulse generation

2000 ◽  
Vol 25 (8) ◽  
pp. 587 ◽  
Author(s):  
E. Zeek ◽  
R. Bartels ◽  
M. M. Murnane ◽  
H. C. Kapteyn ◽  
S. Backus ◽  
...  
Keyword(s):  
Pulse Compression ◽  
High Energy ◽  
Pulse Generation ◽  
Energy Pulse

Study on thermal stress of the the fused silica irradiated by millisecond–nanosecond combined pulse laser

Pramana ◽  
2021 ◽  
Vol 95 (4) ◽  
Author(s):  
Shengqiang Xia ◽  
Jixing Cai ◽  
Xiaoyun Zhang ◽  
Jingyi Li ◽  
Guangyong Jin ◽  
...  
Keyword(s):  
Thermal Stress ◽  
Pulse Laser ◽  
Fused Silica
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