scholarly journals Interlaced Laser Beam Scanning: A Method Enabling an Increase in the Throughput of Ultrafast Laser Machining of Borosilicate Glass

2019 ◽  
Vol 3 (1) ◽  
pp. 14 ◽  
Author(s):  
Krystian Wlodarczyk ◽  
Amiel Lopes ◽  
Paul Blair ◽  
M. Mercedes Maroto-Valer ◽  
Duncan P. Hand
Keyword(s):  
Surface Roughness ◽  
Laser Beam ◽  
Material Removal ◽  
Removal Rate ◽  
Ablation Depth ◽  
Ultrafast Laser ◽  
Laser Machining ◽  
Beam Scanning ◽  
Scanning Method ◽  
Laser Beam Scanning

We provide experimental evidence that the laser beam scanning strategy has a significant influence on material removal rate in the ultrafast laser machining of glass. A comparative study of two laser beam scanning methods, (i) bidirectional sequential scanning method (SM) and (ii) bidirectional interlaced scanning method (IM), is presented for micromachining 1.1-mm-thick borosilicate glass plates (Borofloat® 33). Material removal rate and surface roughness are measured for a range of pulse energies, overlaps, and repetition frequencies. With a pulse overlap of ≤90%, IM can provide double the ablation depth and double the removal rate in comparison to SM, whilst maintaining very similar surface roughness. In both cases, the root-mean-square (RMS) surface roughness (Sq) was in the range of 1 μm to 2.5 μm. For a 95% pulse overlap, the difference was more pronounced, with IM providing up to four times the ablation depth of SM; however, this is at the cost of a significant increase in surface roughness (Sq values >5 μm). The increased ablation depths and removal rates with IM are attributed to a layer-by-layer material removal process, providing more efficient ejection of glass particles and, hence, reduced shielding of the machined area. IM also has smaller local angles of incidence of the laser beam that potentially can lead to a better coupling efficiency of the laser beam with the material.

High-Throughput Picosecond Laser Machining of Aerospace Nickel Superalloy

2021 ◽  
pp. 095440542110288
Author(s):  
Sundar Marimuthu ◽  
Bethan Smith
Keyword(s):  
Surface Roughness ◽  
Material Removal Rate ◽  
Material Removal ◽  
Thermal Damage ◽  
Removal Rate ◽  
Picosecond Laser ◽  
Nickel Superalloy ◽  
Laser Machining ◽  
Process Conditions ◽  
Machining Performance

This manuscript discusses the experimental results on 300 W picosecond laser machining of aerospace-grade nickel superalloy. The effect of the laser’s energetic and beam scanning parameters on the machining performance has been studied in detail. The machining performance has been investigated in terms of surface roughness, sub-surface thermal damage, and material removal rate. At optimal process conditions, a picosecond laser with an average power output of 300 W can be used to achieve a material removal rate (MRR) of ∼140 mm3/min, with thermal damage less than 20 µm. Shorter laser pulse widths increase the material removal rate and reduce the resultant surface roughness. High scanning speeds improve the picosecond laser machining performance. Edge wall taper of ∼10° was observed over all the picosecond laser machined slots. The investigation demonstrates that high-power picosecond lasers can be used for the macro-machining of industrial components at an acceptable speed and quality.

scholarly journals Investigation of an interlaced laser beam scanning method for ultrashort pulse laser micromachining applications

2020 ◽  
Vol 285 ◽  
pp. 116807 ◽  
Author(s):  
Krystian L. Wlodarczyk ◽  
Joerg Schille ◽  
Lucas Naumann ◽  
Amiel A. Lopes ◽  
Ioannis Bitharas ◽  
...  
Keyword(s):  
Laser Beam ◽  
Pulse Laser ◽  
Ultrashort Pulse ◽  
Laser Micromachining ◽  
Beam Scanning ◽  
Ultrashort Pulse Laser ◽  
Scanning Method ◽  
Laser Beam Scanning

Fabrication of Lens Rasters Using a Laser Beam Scanning Method

1998 ◽  
Vol 37 (Part 1, No. 10) ◽  
pp. 5604-5608
Author(s):  
Hyung-Wook Jeon ◽  
Hyuk-Soo Lee ◽  
Jung-Young Son ◽  
Vadim V. Smirnov ◽  
Yong-Jin Choi ◽  
...  
Keyword(s):  
Laser Beam ◽  
Beam Scanning ◽  
Scanning Method ◽  
Laser Beam Scanning

Simultaneous Flatness and Surface Roughness Measurement of a Plastic Sheet Using a Fan-Shaped Laser Beam Scanning System

2008 ◽  
Vol 381-382 ◽  
pp. 233-236 ◽  
Author(s):  
Fang Jung Shiou ◽  
Y.W. Deng
Keyword(s):  
Surface Roughness ◽  
Laser Beam ◽  
Test Object ◽  
Processing System ◽  
Measuring System ◽  
Scanning System ◽  
Beam Scanning ◽  
System A ◽  
Fringe Width ◽  
Laser Beam Scanning

A fan-shaped laser beam scanning measuring system based on the triangulation principle, was newly developed in this study to measure simultaneously the flatness and the surface roughness of a surface plate with good reflectivity after a suitable calibration. The developed system mainly consists of a micro-focus fan-shaped line laser, an image processing system, a PC-based 3-axis machine, and a PC. The height value of the object can be calculated, based on the offset between the position projected onto the object and the position projected onto the platform, after carrying out the height calibration with gauge blocks. According to the scattering theorem, a correlation between the surface roughness of the test object measured with a precision stylus instrument and the average fringe width projected onto the test object surface, has been constructed.

A study on the removal of paint and oxide layer on the steel surface by laser beam scanning method

2021 ◽  
pp. 2140006
Author(s):  
Ji-Eon Kim ◽  
Jong-Do Kim
Keyword(s):  
Laser Beam ◽  
Oxide Layer ◽  
Steel Surface ◽  
Surface Cleaning ◽  
Laser Cleaning ◽  
Beam Scanning ◽  
Scanning Method ◽  
Line Beam ◽  
Laser Beam Scanning ◽  
Beam Patterns

In this study, a laser cleaning method was developed in order to replace the existing manual work-based technologies. The experimental investigation analyzed the cleaning properties of the paint and the oxide layer on the steel surface according to the laser beam scanning method. Experiments showed that in the cleaning process, the line beam patterns with a moving stage showed differences in heat input depending on the area, and the square area beam patterns obtained with control of a Galvano scanner showed uniform cleaning performance. The results of this study demonstrated that through the prosed laser cleaning technique, oxide layers as well as paint on steel surfaces can be removed with excellent precision, which is expected to be useful in the development of eco-friendly surface cleaning techniques.

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