A processing technology of grooves by picosecond ultrashort pulse laser in Ni alloy: Enhancing efficiency and quality

Zhao, Wanqin; Wang, Lingzhi; Yu, Zhishui; Chen, Jieshi; Yang, Jin

doi:10.1016/j.optlastec.2018.09.056

Cited by 30 publications

(15 citation statements)

References 21 publications

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“…A constant deepening rate of laser-processed grooves was achieved up to an aspect ratio (depth/width) of approximately 1.5 [6], which corresponds to the phase of constant depth progress observed in areal micromachining of metals [13] and silicon [14], where the aspect ratio is typically <1. The depth progress gradually slows down with increasing depth of the groove [6,8,9], reaching a limit when the absorbed fluence is reduced to the value of the ablation threshold everywhere on the walls of the groove [2]. This behavior corresponds to the one found for percussion drilling of microholes, where a decreasing rate of the depth progress was observed with the increasing number of applied pulses, which finally stagnated at the maximum reachable depth [15,16].…”

Section: Introductionmentioning

confidence: 70%

“…The laser micromachined grooves with depths of a few tens up to several hundreds of micrometers typically feature a V-shaped geometry in metals [7,8], semiconductors [2,9], dielectrics [10] and polymers [11]. The resulting width of the grooves mainly depends on the diameter of the laser beam, the incident peak fluence and the material-specific ablation threshold [12].…”

Section: Introductionmentioning

confidence: 99%

“…The resulting width of the grooves mainly depends on the diameter of the laser beam, the incident peak fluence and the material-specific ablation threshold [12]. Experimental results revealed the influence of various processing parameters on the resulting depth of a micromachined groove, such as the pulse energy or the irradiated peak fluence, the scanning speed, the number of scans over the surface [2,8,9] and the ablation threshold [12]. The groove's depth can be increased by multiple scans, whereas high pulse energies [2,8] and low scanning speeds [9] result in a higher increase in the depth for each scan.…”

Section: Introductionmentioning

confidence: 99%

“…Experimental results revealed the influence of various processing parameters on the resulting depth of a micromachined groove, such as the pulse energy or the irradiated peak fluence, the scanning speed, the number of scans over the surface [2,8,9] and the ablation threshold [12]. The groove's depth can be increased by multiple scans, whereas high pulse energies [2,8] and low scanning speeds [9] result in a higher increase in the depth for each scan. The progress of the depth of micromachined grooves exhibited a linear correlation with the number of scans for cutting through thin metal foils with a thickness of up to 50 µm [1] and for micromachining of shallow grooves with a depth of up to a few tens of micrometers in semiconductors [9].…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Analytical Model for the Depth Progress during Laser Micromachining of V-Shaped Grooves

2022

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An analytical model is presented that allows predicting the progress and the final depth obtained by laser micromachining of grooves in metals with ultrashort laser pulses. The model assumes that micromachined grooves feature a V-shaped geometry and that the fluence absorbed along the walls is distributed with a linear increase from the edge to the tip of the groove. The depth progress of the processed groove is recursively calculated based on the depth increments induced by successive scans of the laser beam along the groove. The experimental validation confirms the model and its assumptions for micromachining of grooves in a Ti-alloy with femtosecond pulses and different pulse energies, repetition rates, scanning speeds and number of scans.

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Section: Introductionmentioning

confidence: 70%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Analytical Model for the Depth Progress during Laser Micromachining of V-Shaped Grooves

2022

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“…Especially, the emerged high pulse electric-current and its current derivative may destroy suddenly some expensive electronic components, electronic circuits, and switchgears for the high-voltage transmission lines and others. The related technology of the high pulse electric-current and its current derivative can be applied in some research areas, for instance, the electromagnetic pulse technology [1,2,3], controlled fusion [4], thermal plasma [5], pulse laser technology [6], and high voltage process [7] and others.…”

Section: Introductionmentioning

confidence: 99%

Superconducting currents and charge gradients in the octonion spaces

Weng

2020

Preprint

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The paper focuses on applying the algebra of octonions to explore the influence of electric-charge gradients on the electric-current derivatives, revealing some of major influence factors of high pulse electric-currents. J. C. Maxwell was the first scholar to utilize the algebra of quaternions to study the physical properties of electromagnetic fields. The contemporary scholars employ simultaneously the quaternions and octonions to investigate the physical properties of electromagnetic fields, including the octonion field strength, field source, linear momentum, angular momentum, torque, and force and so forth. When the octonion force is equal to zero, it is able to achieve eight equations independent of each other, including the fluid continuity equation, current continuity equation, force equilibrium equation, and second-force equilibrium equation and so on. One of inferences derived from the second-force equilibrium equation is that the charge gradient and current derivative are interrelated closely, two of them must satisfy the need of the second-force equilibrium equation synchronously. Meanwhile the electromagnetic strength and linear momentum both may exert an influence on the current derivative to a certain extent. The above states that the charge gradient and current derivative are two correlative physical quantities, they must meet the requirement of second-force equilibrium equation. By means of controlling the charge gradients and other physical quantities, it is capable of restricting the development process of current derivatives, reducing the damage caused by the instantaneous impact of high pulse electric-currents, enhancing the anti-interference ability of electronic equipments to resist the high pulse electric-currents and their current derivatives. Further the second-force equilibrium equation is able to explain two types of superconducting currents.

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Patterned Laser Ablation of Microgrooves with Controllable Cross‐Sections

Qiu

Guo

Huang

et al. 2023

Adv Materials Technologies

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Fabricating precision microgrooves with controllable cross‐sections on difficult‐to‐machine materials is significantly valuable but still challenging. Herein, a patterned laser‐induced microjet‐assisted ablation method for cross‐sectional profiles controllable laser micromachining is proposed. During the liquid‐assisted laser ablation process, debris and bubbles that may disturb the laser energy deposition can be instantaneously expelled by a directional laser‐induced microjet. The Gaussian laser spot is spatially modulated into specific geometric shapes, such as triangles, to tune locally deposited laser energy to carve microgrooves with designed cross‐sections. To achieve customized microgrooves efficiently, a reliable geometrical model based on the ablation threshold theory is developed to guide the processing parameter selection, including the laser spot shape, polarization, pulse energy, and scanning strategies. The simulation and experimental results confirm that this method achieves the decoupled control of the groove depth and width in a single‐path laser ablation process. Using this method, the design and manufacturing of microgrooves with controllable cross‐sections on single crystalline silicon carbide are demonstrated. The patterned laser‐induced microjet‐assisted ablation method provides a new route for fabricating precision microgrooves with controllable cross‐sections on difficult‐to‐machine materials.

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A processing technology of grooves by picosecond ultrashort pulse laser in Ni alloy: Enhancing efficiency and quality

Cited by 30 publications

References 21 publications

Analytical Model for the Depth Progress during Laser Micromachining of V-Shaped Grooves

Analytical Model for the Depth Progress during Laser Micromachining of V-Shaped Grooves

Superconducting currents and charge gradients in the octonion spaces

Patterned Laser Ablation of Microgrooves with Controllable Cross‐Sections

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