Double-pulse femtosecond laser peening of aluminum alloy AA5038: Effect of inter-pulse delay on transient optical plume emission and final surface micro-hardness

2016 ◽  
Vol 109 (21) ◽  
pp. 211902 ◽  
Author(s):  
E. I. Ageev ◽  
V. Yu. Bychenkov ◽  
A. A. Ionin ◽  
S. I. Kudryashov ◽  
A. A. Petrov ◽  
...  
Keyword(s):  
Aluminum Alloy ◽  
Femtosecond Laser ◽  
Double Pulse ◽  
Laser Peening ◽  
Micro Hardness ◽  
Pulse Delay ◽  
Final Surface ◽  
Plume Emission

Ablation area quasiperiodic oscillations in semiconductors with femtosecond laser double-pulse delay

2014 ◽  
Vol 39 (8) ◽  
pp. 2382 ◽  
Author(s):  
Xin Li ◽  
Cong Li ◽  
Lan Jiang ◽  
Xuesong Shi ◽  
Ning Zhang ◽  
...  
Keyword(s):  
Femtosecond Laser ◽  
Double Pulse ◽  
Pulse Delay ◽  
Ablation Area ◽  
Quasiperiodic Oscillations

scholarly journals Anisotropy modulations of femtosecond laser pulse induced periodic surface structures on silicon by adjusting double pulse delay

2014 ◽  
Vol 22 (13) ◽  
pp. 15820 ◽  
Author(s):  
Weina Han ◽  
Lan Jiang ◽  
Xiaowei Li ◽  
Qingsong Wang ◽  
Hao Li ◽  
...  
Keyword(s):  
Laser Pulse ◽  
Femtosecond Laser ◽  
Femtosecond Laser Pulse ◽  
Double Pulse ◽  
Surface Structures ◽  
Pulse Delay ◽  
Periodic Surface

scholarly journals Improvement of Etching Anisotropy in Fused Silica by Double-Pulse Fabrication

Micromachines ◽  
2020 ◽  
Vol 11 (5) ◽  
pp. 483
Author(s):  
Valdemar Stankevič ◽  
Jonas Karosas ◽  
Gediminas Račiukaitis ◽  
Paulius Gečys
Keyword(s):  
Femtosecond Laser ◽  
Processing Speed ◽  
Laser Pulses ◽  
Processing Parameters ◽  
Fused Silica ◽  
Double Pulse ◽  
Pulse Delay ◽  
Pulse Processing ◽  
Wide Range ◽  
Significant Process

Femtosecond laser-induced selective etching (FLISE) is a promising technology for fabrication of a wide range of optical, mechanical and microfluidic devices. Various etching conditions, together with significant process optimisations, have already been demonstrated. However, the FLISE technology still faces severe limitations for a wide range of applications due to limited processing speed and polarization-dependent etching. In this article, we report our novel results on the double-pulse processing approach on the improvement of chemical etching anisotropy and >30% faster processing speed in fused silica. The effects of pulse delay and pulse duration were investigated for further understanding of the relations between nanograting formation and etching. The internal sub-surface modifications were recorded with double cross-polarised pulses of a femtosecond laser, and a new nanograting morphology (grid-like) was demonstrated by precisely adjusting the processing parameters in a narrow processing window. It was suggested that this grid-like morphology impacts the etching anisotropy, which could be improved by varying the delay between two orthogonally polarized laser pulses.

The influence of double pulse delay and ambient pressure on femtosecond laser ablation of silicon

2015 ◽  
Vol 66 ◽  
pp. 68-77 ◽  
Author(s):  
Ying Qi ◽  
Hongxia Qi ◽  
Qinxin Wang ◽  
Zhou Chen ◽  
Zhan Hu
Keyword(s):  
Laser Ablation ◽  
Femtosecond Laser ◽  
Ambient Pressure ◽  
Femtosecond Laser Ablation ◽  
Double Pulse ◽  
Pulse Delay

scholarly journals High energy femtosecond laser peening of 2024 aluminum alloy

Procedia CIRP ◽  
2018 ◽  
Vol 74 ◽  
pp. 357-361 ◽  
Author(s):  
Shuting Lei ◽  
Guang Yang ◽  
Xinya Wang ◽  
Shouyuan Chen ◽  
Amy Prieb ◽  
...  
Keyword(s):  
Aluminum Alloy ◽  
Femtosecond Laser ◽  
High Energy ◽  
Laser Peening ◽  
2024 Aluminum Alloy

Chromium thin film ablation with double pulse of femtosecond laser

2004 ◽  
Author(s):  
Etsuji Ohmura ◽  
Tomohiro Okamoto ◽  
Seiji Fujiwara ◽  
Tomokazu Sano ◽  
Isamu Miyamoto
Keyword(s):  
Thin Film ◽  
Femtosecond Laser ◽  
Double Pulse

scholarly journals Electric Field Assisted Femtosecond Laser Preparation of Au@TiO2 Composites with Controlled Morphology and Crystallinity for Photocatalytic Degradation

Materials ◽  
2021 ◽  
Vol 14 (14) ◽  
pp. 3816
Author(s):  
Xiaojie Li ◽  
Xin Li ◽  
Pei Zuo ◽  
Xiaozhe Chen ◽  
Misheng Liang ◽  
...  
Keyword(s):  
Femtosecond Laser ◽  
Electric Field ◽  
Photocatalytic Degradation ◽  
Au Nanoparticles ◽  
High Efficiency ◽  
Free Electron Density ◽  
Pulse Delay ◽  
Dye Pollutants ◽  
Amorphous Tio2 ◽  
Laser Liquid

TiO2 is popular in photocatalytic degradation dye pollutants due to its abundance and its stability under photochemical conditions. Au loaded TiO2 can achieve efficient absorption of visible light and deal with the problem of low conversion efficiency for solar energy of TiO2. This work presents a new strategy to prepare Au nanoparticles-loaded TiO2 composites through electric−field−assisted temporally−shaped femtosecond laser liquid-phase ablation of Au3+ and amorphous TiO2. By adjusting the laser pulse delay and electric field parameters, gold nanoparticles with different structures can be obtained, such as nanospheres, nanoclusters, and nanostars (AuNSs). AuNSs can promote the local crystallization of amorphous TiO2 in the preparation process and higher free electron density can also be excited to work together with the mixed crystalline phase, hindering the recombination between carriers and holes to achieve efficient photocatalytic degradation. The methylene blue can be effectively degraded by 86% within 30 min, and much higher than the 10% of Au nanoparticles loaded amorphous TiO2. Moreover, the present study reveals the crystallization process and control methods for preparing nanoparticles by laser liquid ablation, providing a green and effective new method for the preparation of high-efficiency photocatalytic materials.

Modulation and mechanism of shockwaves induced on metals by femtosecond laser double-pulse

2020 ◽  
Vol 53 (16) ◽  
pp. 165104
Author(s):  
Guoyan Wang ◽  
Jingya Sun ◽  
Pengfei Ji ◽  
Jie Hu ◽  
Jiaxin Sun ◽  
...  
Keyword(s):  
Femtosecond Laser ◽  
Double Pulse
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