scholarly journals Ablation Threshold Measurement and Chemical Modification of UV Nanosecond Laser Micromachining of Polycrystalline Diamond

2021 ◽  
Author(s):  
Naveed Ullah ◽  
Jianlei Cui ◽  
Zhengjie Fan ◽  
Xuesong Mei
Keyword(s):  
Chemical Modification ◽  
Ablation Threshold ◽  
Pulsed Laser ◽  
Polycrystalline Diamond ◽  
Research Direction ◽  
Laser Micromachining ◽  
Laser Source ◽  
Nanosecond Laser ◽  
Graphite Phase ◽  
Experimental Reference

Abstract In recent years, the influence of pulsed laser interaction with material has become a research hotspot. The micromachining of polycrystalline diamond with pulsed laser is a very important research direction. This study scrutinized the ablation threshold and chemical modification of PCD irradiated by UV nanosecond laser, which were not investigated before. Irradiated a bulk PCD in air using a UV nanosecond laser source to perform multi-pulse processing at a wavelength of 355nm. Based on the linear relation between the laser pulse energy density with crater diameter the Gaussian distribution of the laser intensity on the cross-section the ablation threshold of PCD was determined to be about 3.7326 J/cm2. And also investigated that the photochemical processing of UV nanosecond laser irradiation of PCD the sp3 structure transforms to the sp2 graphite phase. So, this study contributes a theoretical and experimental reference for the UV nanosecond laser micromachining of PCD material in research and manufacturing industries.

scholarly journals Ablation Threshold Measurement and Chemical Modification of UV Nanosecond Laser Micromachining of Polycrystalline Diamond

2021 ◽  
Vol 218 (24) ◽  
pp. 2170067
Author(s):  
Naveed Ullah ◽  
Jianlei Cui ◽  
Xiangyang Dong ◽  
Xuyang Fang ◽  
Jian Dou ◽  
...  
Keyword(s):  
Chemical Modification ◽  
Ablation Threshold ◽  
Polycrystalline Diamond ◽  
Laser Micromachining ◽  
Nanosecond Laser ◽  
Threshold Measurement

Ultrashort Pulsed Laser Micromachining of Polycrystalline Diamond

2012 ◽  
Vol 497 ◽  
pp. 220-224 ◽  
Author(s):  
Zeng Qiang Li ◽  
Qi Wu ◽  
Jun Wang
Keyword(s):  
Laser Intensity ◽  
Pulsed Laser ◽  
Polycrystalline Diamond ◽  
Traverse Speed ◽  
Laser Micromachining ◽  
Grinding Wheels ◽  
Microstructure Characteristics ◽  
Femtosecond Laser Micromachining ◽  
High Laser ◽  
Potential Applications

A femtosecond pulsed Nd:YAG laser was used to micromachine polycrystalline diamonds (PCD) and study the ablated microstructure characteristics under different irradiation parameters. With high laser intensity and low traverse speed, a micro cone with very smooth surface and clear edge can be obtained. There was almost no recast layer around the cone and no phase transition on the ablated surfaces was found. By contrast, the use of low laser intensity and high traverse speed could ablate only the grain boundaries without any damage to the diamond grits. These results suggest a need for further research in femtosecond laser micromachining of PCD for potential applications in fabricating new types of micro grinding wheels or diamond pencils.

scholarly journals Smoothing additive manufactured parts using ns-pulsed laser radiation

2021 ◽  
Author(s):  
Florian Kuisat ◽  
Fernando Lasagni ◽  
Andrés Fabián Lasagni
Keyword(s):  
Surface Roughness ◽  
Mechanical Performance ◽  
State Of The Art ◽  
Pulsed Laser ◽  
Industrial Applications ◽  
Laser Source ◽  
Pulsed Laser Radiation ◽  
Current State ◽  
The Impact

AbstractIt is well known that the surface topography of a part can affect its mechanical performance, which is typical in additive manufacturing. In this context, we report about the surface modification of additive manufactured components made of Titanium 64 (Ti64) and Scalmalloy®, using a pulsed laser, with the aim of reducing their surface roughness. In our experiments, a nanosecond-pulsed infrared laser source with variable pulse durations between 8 and 200 ns was applied. The impact of varying a large number of parameters on the surface quality of the smoothed areas was investigated. The results demonstrated a reduction of surface roughness Sa by more than 80% for Titanium 64 and by 65% for Scalmalloy® samples. This allows to extend the applicability of additive manufactured components beyond the current state of the art and break new ground for the application in various industrial applications such as in aerospace.

Chemical modification of lignocellulosic materials by irradiation with Nd-YAG pulsed laser

2001 ◽  
Vol 183 (1-2) ◽  
pp. 120-125 ◽  
Author(s):  
V.R. Botaro ◽  
C.G. dos Santos ◽  
G. Arantes Júnior ◽  
A.R. da Costa
Keyword(s):  
Chemical Modification ◽  
Pulsed Laser ◽  
Lignocellulosic Materials

scholarly journals Angular dispersion compensation for acousto-optic devices used for ultrashort-pulsed laser micromachining

2001 ◽  
Vol 9 (4) ◽  
pp. 200 ◽  
Author(s):  
B.K. Ann Ngoi ◽  
Krishnan Venkatakrishnan ◽  
L.E.N. Lim ◽  
B. Tan
Keyword(s):  
Dispersion Compensation ◽  
Pulsed Laser ◽  
Laser Micromachining ◽  
Angular Dispersion ◽  
Ultrashort Pulsed Laser

Hologram indexing in LiNbO_3 with a tunable pulsed laser source

1979 ◽  
Vol 18 (15) ◽  
pp. 2555 ◽  
Author(s):  
D. A. Woodbury ◽  
T. A. Rabson ◽  
F. K. Tittel
Keyword(s):  
Pulsed Laser ◽  
Laser Source

Pulse-on-demand laser operation from nanosecond to femtosecond pulses and its application for high-speed processing

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Jaka Petelin ◽  
Luka Černe ◽  
Jaka Mur ◽  
Vid Agrež ◽  
Jernej Jan Kočica ◽  
...  
Keyword(s):  
Indium Tin Oxide ◽  
Continuous Wave ◽  
Second Harmonic ◽  
Laser Source ◽  
Optical Modulator ◽  
Nanosecond Laser ◽  
Femtosecond Pulses ◽  
Chirped Pulse ◽  
On Demand ◽  
Nanosecond Pulses

Abstract In this manuscript we present a true pulse-on-demand laser design concept using two different approaches. First, we present a fiber master oscillator power amplifier (MOPA) based quasi-continuous wave (CW) laser, working at high modulation bandwidths, for generation of nanosecond pulses. Second, we present a hybrid chirped pulse amplification (CPA)-based laser, combining a chirped-pulse fiber amplifier and an additional solid-state amplifier, for generation of femtosecond pulses. The pulse-on-demand operation is achieved without an external optical modulator/shutter at high-average powers and flexible repetition rates up to 40 MHz, using two variants of the approach for near-constant gain in the amplifier chain. The idler and marker seed sources are combined in the amplifier stages and separated at the out using either wavelength-based separation or second harmonic generation (SHG)-generation-based separation. The nanosecond laser source is further applied to high throughput processing of thin film materials. The laser is combined with a resonant scanner, using the intrinsic pulse-on-demand operation to compensate the scanner’s sinusoidal movement. We applied the setup to processing of indium tin oxide (ITO) and metallic films on flexible substrates.

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