Ultrafast laser machining: process optimization and applications

2021 ◽  
Author(s):  
Norman Hodgson ◽  
Albrecht Steinkopff ◽  
Sebastian Heming ◽  
Hortense Allegre ◽  
Hatim Haloui ◽  
...  
Keyword(s):  
Process Optimization ◽  
Ultrafast Laser ◽  
Machining Process ◽  
Laser Machining

scholarly journals Investigation to Improve the Pool Boiling Heat Transfer Characteristics Using Laser-Textured Copper-Grooved Surfaces

2020 ◽  
Vol 2020 ◽  
pp. 1-8 ◽  
Author(s):  
Dharmendra Mani ◽  
Suresh Sivan ◽  
Hafiz Muhammad Ali ◽  
Udaya Kumar Ganesan
Keyword(s):  
Heat Transfer ◽  
Surface Modification ◽  
Pool Boiling ◽  
Research Work ◽  
Picosecond Laser ◽  
Machining Process ◽  
Laser Machining ◽  
Textured Surface ◽  
Surface Characterisation ◽  
Different Depths

Improving the performance of pool boiling with critical heat flux of pool boiling and enhancing the coefficient of heat transfer through surface modification technique have gained a lot of attention. These surface modifications can be done at different scales using various techniques. However, along with the performance improvement, the durability and stability of the surface modification are very crucial. Laser machining is an attractive option in this aspect and is gaining a lot of attention. In the present experimentation research work, pool boiling attributed performance of copper-grooved surfaces obtained through picosecond laser machining method is investigated. The performance of the modified surfaces was compared with the plain surface serving as reference. In this, three square grooved patterns with the same pitch (100 μm) and width (100 μm) but different depths (30, 70, and 100 μm) were investigated. Different depths were obtained by varying the scanning speed of the laser machine. In addition to the microchannel effect, the grain structuring during the laser machining process creates additional nucleation sites which has proven its effectiveness in improving the pool boiling performance. In all aspects, the pool boiling performance of the grooved laser-textured surface has showed increased surface characterisation as compared with the surface of copper.

Experimental Study of Micromachining on Borosilicate Glass Using CO2 Laser

2020 ◽  
Vol 143 (5) ◽  
Author(s):  
Vishnu Vardhan Posa ◽  
Murali Sundaram
Keyword(s):  
Laser Scanning ◽  
Laser Energy ◽  
Removal Rate ◽  
Scanning Speed ◽  
Machining Process ◽  
Laser Machining ◽  
Glass Work ◽  
Workpiece Material ◽  
Laser Parameters ◽  
Wide Range

Abstract Laser beam machining (LBM) is a versatile process that can shape a wide range of engineering materials such as metals, ceramics, polymers, and composite materials. However, machining of glass materials by LBM is a challenge as most of the laser energy is not absorbed by the surface. In this study, an attempt has been made to increase the absorptivity of the glass material by using a coating on the surface of the material. Glass has been used in this study because of its extensive applications in the micro-opto-electro-mechanical systems. The optimal machining depends on both laser parameters and properties of the workpiece material. There are number of laser parameters that can be varied in the laser machining process. It is difficult to find optimal laser parameters due to the mutual interaction of laser parameters. A statistical study based on design of experiment (DoE) has been made to study the effect of coating and parameters like laser power, laser scanning speed, angle of inclination of the workpiece on depth of the slot, width of the slot, aspect ratio, and material removal rate (MRR) in the laser machining process using 2k factorial design and analysis of variance (ANOVA). On an average, four times increase in depth of the slot, two times increase in width of the slot and seven times increase in the MRR were observed in the glass samples with coating when compared to uncoated glass work samples.

Ultrafast laser machining of tapered microchannels in glass and PDMS

2012 ◽  
Vol 50 (2) ◽  
pp. 210-214 ◽  
Author(s):  
Samira Darvishi ◽  
Thomas Cubaud ◽  
Jon P. Longtin
Keyword(s):  
Ultrafast Laser ◽  
Laser Machining

Laser-Assisted Waterjet Micro-Grooving of Silicon Wafers for Minimizing Heat Affected Zone

2016 ◽  
Vol 861 ◽  
pp. 133-138
Author(s):  
Xiang Ning Pan ◽  
Chuan Zhen Huang ◽  
Jun Wang ◽  
Hong Tao Zhu ◽  
Peng Yao
Keyword(s):  
Heat Affected Zone ◽  
Predictive Models ◽  
Functional Materials ◽  
Groove Depth ◽  
Silicon Wafers ◽  
Machining Process ◽  
Laser Machining ◽  
Micro Machining ◽  
Micro Grooving ◽  
Haz Width

Laser-assisted waterjet micro-machining can significantly reduce the thermal damages to the workpiece as compared to the traditional laser machining process, and hence can overcome the problems associated with laser machining, such as the formation of heat-affected zone, which is a serious issue for thermal sensitive and functional materials. An experimental study on micro-grooving of monocrystalline silicon wafers is reported in this study to explore the effects of process parameters on the groove depth and width as well as the heat-affected zone (HAZ) width. Predictive models based on dimensionl analysis are then developed for estiamting the groove characteristics.

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