Surface microstructure and chemistry of polyimide by single pulse ablation of picosecond laser

2018 ◽  
Vol 434 ◽  
pp. 588-595 ◽  
Author(s):  
Qifeng Du ◽  
Ting Chen ◽  
Jianguo Liu ◽  
Xiaoyan Zeng
Keyword(s):  
Single Pulse ◽  
Picosecond Laser ◽  
Surface Microstructure ◽  
Single Pulse Ablation

Influence of picosecond laser irradiation on nickel-based superalloy surface microstructure

2012 ◽  
Vol T149 ◽  
pp. 014079 ◽  
Author(s):  
S Petronić ◽  
D Milovanovic ◽  
A Milosavljević ◽  
M Momcilovic ◽  
D Petrusko
Keyword(s):  
Laser Irradiation ◽  
Picosecond Laser ◽  
Surface Microstructure ◽  
Nickel Based Superalloy

Single-pulse drilling study on Au, Al and Ti alloy by using a picosecond laser

2008 ◽  
Vol 95 (3) ◽  
pp. 739-746 ◽  
Author(s):  
J. Cheng ◽  
W. Perrie ◽  
M. Sharp ◽  
S. P. Edwardson ◽  
N. G. Semaltianos ◽  
...  
Keyword(s):  
Single Pulse ◽  
Picosecond Laser ◽  
Ti Alloy

scholarly journals Single-pulse ablation of multi-depth structures via spatially filtered binary intensity masks

2018 ◽  
Vol 57 (8) ◽  
pp. 1904 ◽  
Author(s):  
Daniel J. Heath ◽  
James A. Grant-Jacob ◽  
Robert W. Eason ◽  
Ben Mills
Keyword(s):  
Single Pulse ◽  
Single Pulse Ablation

Flexible periodical micro- and nano-structuring of a stainless steel surface using dual-wavelength double-pulse picosecond laser irradiation

RSC Advances ◽  
2015 ◽  
Vol 5 (92) ◽  
pp. 75075-75080 ◽  
Author(s):  
Mindaugas Gedvilas ◽  
Justinas Mikšys ◽  
Gediminas Račiukaitis
Keyword(s):  
Stainless Steel ◽  
Steel Surface ◽  
Single Pulse ◽  
Picosecond Laser ◽  
Double Pulse ◽  
Dual Wavelength ◽  
Stainless Steel Surface ◽  
Pulse Trains ◽  
Ripple Formation ◽  
Linearly Polarized

The picosecond laser-induced ripple formation on a stainless steel surface upon irradiation with linearly-polarized single-pulse and dual-wavelength cross-polarized double-pulse trains in air was studied experimentally.

Residual heat during laser ablation of metals with bursts of ultra-short pulses

2018 ◽  
Vol 7 (3) ◽  
pp. 175-182 ◽  
Author(s):  
Beat Jäggi ◽  
Daniel J. Förster ◽  
Rudolf Weber ◽  
Beat Neuenschwander
Keyword(s):  
Removal Rate ◽  
Single Pulse ◽  
Residual Energy ◽  
Short Pulses ◽  
Pulse Burst ◽  
Calorimetric Measurements ◽  
Key Factor ◽  
Energy Coefficient ◽  
Single Pulse Ablation ◽  
Residual Heat

Abstract The usage of pulse bursts allows increasing the throughput, which still represents a key factor for machining with ultra-short pulsed lasers. The influence of the number of pulses within a burst on the specific removal rate is investigated for copper and stainless steel. Furthermore, calorimetric measurements were performed to estimate the residual energy coefficient as well as the absorptance of machined surfaces for copper to explain the reduced specific removal rate for a 2-pulse burst and the similar or even higher rate for a 3-pulse burst compared to single pulse ablation. Based on the measurements, a description of the process using single pulses and pulse bursts with up to three pulses is presented.

Investigation of Femtosecond Laser Ablation Threshold for Nickel Template

2014 ◽  
Vol 633-634 ◽  
pp. 665-670 ◽  
Author(s):  
Lei Zhang ◽  
Xiao Wen Cao ◽  
Shun Guang Li ◽  
Ru Yi Xiang ◽  
Hui Chao Sun
Keyword(s):  
Femtosecond Laser ◽  
Ablation Threshold ◽  
Femtosecond Laser Ablation ◽  
Target Surface ◽  
Single Pulse ◽  
Normal Incidence ◽  
Objective Lens ◽  
Temperature Model ◽  
Two Temperature ◽  
Single Pulse Ablation

This paper presents a theoretical and experimental investigation into the ablation threshold of nickel template by femtosecond laser in air at atmospheric pressure. The laser pulses used for the study are 800 nm in wavelength, 100fs in pulse duration, and 1KHz in repetition rate. The two-temperature model is used to predict the single-pulse ablation threshold for nickel theoretically. Micro-hole ablation experiments are carried out in air by focusing the femtosecond laser beam on the nickel target surface at normal incidence with the long-focus objective lens of enlargement factor 50 and NA=0.7 to determine the single-pulse and multi-pulse ablation thresholds for nickel by setting up the relationship between the measured hole diameters and the pulse energies. The single pulse ablation threshold of 4132.98 Jm-2obtained experimentally is very close to that of 3907.99 Jm-2predicted by two-temperature model. The incubation factorξ, which describes the changes of the multi-pulse ablation thresholds with the number of pulses, is determined to be 0.812 for nickel.

scholarly journals Influence of laser texturing on tribological properties of DLC coatings

2021 ◽  
Vol 27 (2) ◽  
pp. 119-123
Author(s):  
Norbert Radek ◽  
Dorota Tokar ◽  
Artur Kalinowski ◽  
Jacek Pietraszek
Keyword(s):  
Tribological Properties ◽  
Sliding Friction ◽  
Surface Texturing ◽  
Picosecond Laser ◽  
Microstructure Analysis ◽  
Surface Microstructure ◽  
Radiation Wavelength ◽  
Laser Texturing ◽  
Dlc Coatings ◽  
Surface Microgeometry

Abstract The work presents the use of laser texturing of DLC coatings to improve tribological properties. The coatings were applied by the PVD method to the rings made of 4H13 steel. The surface texturing was performed with the TruMICRO 5325c picosecond laser with the radiation wavelength λ = 343 nm. The surface microstructure analysis, surface microgeometry and microhardness measurements and tribological tests were carried out. The problem presented in the paper can be used to extend the knowledge of the areas of application of DLC coatings, especially in sliding friction pairs.

Single-pulse cell stimulation with a near-infrared picosecond laser

2005 ◽  
Vol 87 (24) ◽  
pp. 243901 ◽  
Author(s):  
Shigeki Iwanaga ◽  
Nicholas Smith ◽  
Katsumasa Fujita ◽  
Satoshi Kawata ◽  
Osamu Nakamura
Keyword(s):  
Near Infrared ◽  
Single Pulse ◽  
Picosecond Laser ◽  
Cell Stimulation
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