Study on water-assisted laser ablation mechanism based on water layer characteristics

Zhou, Jia; Huang, Yuxing; Zhao, Yaowu; Jiao, Hui; Liu, Qing-yuan; Long, Yuhong

doi:10.1016/j.optcom.2019.05.060

Cited by 24 publications

(10 citation statements)

References 25 publications

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“…Water is most commonly used as a laser ablation assisting liquid since it is cheap, harmless, and recyclable [ 20 , 28 ]. Water can be introduced into the ablation zone in multiple ways: by submerging the workpiece into standing [ 22 , 26 , 29 , 30 ] or flowing water [ 20 , 21 , 31 , 32 ]; by guiding a laser beam in the water jet [ 33 , 34 ]; or by spraying water mist [ 18 ] or a water jet [ 19 , 28 ] next to the laser beam. Most studies have investigated laser ablation with workpieces submerged into a standing or low-velocity liquid flow with a liquid layer thickness of a few to tens of millimetres.…”

Section: Introductionmentioning

confidence: 99%

“…Most studies have investigated laser ablation with workpieces submerged into a standing or low-velocity liquid flow with a liquid layer thickness of a few to tens of millimetres. The key limitations of such a design were noted in [ 20 , 28 , 35 ]: laser heating formed bubbles around the ablation zone, generating waves at the surface of the liquid. Consequently, waves caused instability in laser processing conditions—variations in laser focus position, beam diffraction, and refraction angles; as a result, hampering the continuity and uniformity of ablated grooves [ 35 ].…”

Section: Introductionmentioning

confidence: 99%

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Efficient Water-Assisted Glass Cutting with 355 nm Picosecond Laser Pulses

et al. 2022

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In this study, the cutting of borosilicate glass plates in ambient air and water with a 355 nm wavelength picosecond laser was carried out. Low (2.1–2.75 W) and high (15.5 W) average laser power cutting regimes were studied. Thorough attention was paid to the effect of the hatch distance on the cutting quality and characteristic strength of glass strips cut in both environments. At optimal cutting parameters, ablation efficiency and cutting rates were the highest but cut sidewalls were covered with periodically recurring ridges. Transition to smaller hatch values improved the cut sidewall quality by suppressing the ridge formation, but negatively affected the ablation efficiency and overall strength of glass strips. Glass strips cut in water in the low-laser-power regime had the highest characteristic strength of 117.6 and 107.3 MPa for the front and back sides, respectively. Cutting in a high-laser-power regime was only carried out in water. At 15.5 W, the ablation efficiency and effective cutting speed per incident laser power increased by 16% and 22%, respectively, compared with cutting in water in a low-laser-power regime.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Efficient Water-Assisted Glass Cutting with 355 nm Picosecond Laser Pulses

et al. 2022

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“…The lower effective glass-cutting speed in water at t = 110 µm (compared to cutting in ambient air) could be affected by the laser fluence loss in water (laser beam reflections, distortion, scattering, absorption in the water layer), and also due to the increased glass cooling effect in the ablation zone [ 49 , 50 , 51 , 52 ]. At greater depths in water, steeper cut walls and flatter groove bottoms mitigated efficiency losses in water.…”

Section: Resultsmentioning

confidence: 99%

Femtosecond Laser Cutting of 110–550 µm Thickness Borosilicate Glass in Ambient Air and Water

et al. 2023

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The cutting quality and strength of strips cut with femtosecond-duration pulses were investigated for different thicknesses of borosilicate glass plates. The laser pulse duration was 350 fs, and cutting was performed in two environments: ambient air and water. When cutting in water, a thin flowing layer of water was formed at the front surface of the glass plate by spraying water mist next to a laser ablation zone. The energy of pulses greatly exceeded the critical self-focusing threshold in water, creating conditions favorable for laser beam filament formation. Laser cutting parameters were individually optimized for different glass thicknesses (110–550 µm). The results revealed that laser cutting of borosilicate glass in water is favorable for thicker glass (300–550 µm) thanks to higher cutting quality, higher effective cutting speed, and characteristic strength. On the other hand, cutting ultrathin glass plates (110 µm thickness) demonstrated almost identical performance and cutting quality results in both environments. In this paper, we studied cut-edge defect widths, cut-sidewall roughness, cutting throughput, characteristic strength, and band-like damage formed at the back surface of laser-cut glass strips.

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“…In addition, the waterjet is disturbed during machining due to the splashing of debris. Moreover, waterjet-guided laser machining equipment is generally expensive and has high maintenance costs, which limits the application of this technology in the manufacturing industry [ 25 ]. To avoid these problems, Madhukar and Mullick et al [ 26 , 27 , 28 , 29 , 30 , 31 ] proposed a coaxial waterjet-assisted laser machining method.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on Coaxial Waterjet-Assisted Laser Scanning Machining of Nickel-Based Special Alloy

Wang

Yuan

et al. 2023

Micromachines

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The problems of the recast layer, oxide layer, and heat-affected zone (HAZ) in conventional laser machining seriously impact material properties. Coaxial waterjet-assisted laser scanning machining (CWALSM) can reduce the conduction and accumulation of heat in laser machining by the high specific heat capacity of water and can realize the machining of nickel-based special alloy with almost no thermal damage. With the developed experimental setup, the laser ablation threshold and drilling experiments of the K4002 nickel-based special alloy were carried out. The effects of various factors on the thermal damage thickness were studied with an orthogonal experiment. Experimental results have indicated that the ablation threshold of K4002 nickel-based special alloy by a single pulse is 4.15 J/cm2. The orthogonal experiment results have shown that the effects of each factor on the thermal damage thickness are in the order of laser pulse frequency, waterjet speed, pulse overlap rate, laser pulse energy, and focal plane position. When the laser pulse energy is 0.21 mJ, the laser pulse frequency is 1 kHz, the pulse overlap is 55%, the focal plane position is 1 mm, and the waterjet speed is 6.98 m/s, no thermal damage machining can be achieved. In addition, a comparative experiment with laser drilling in the air was carried out under the same conditions. The results have shown that compared with laser machining in the air, the thermal damage thickness of CWALSM is smaller than 1 μm, and the hole taper is reduced by 106%. There is no accumulation and burr around the hole entrance, and the thermal damage thickness range is 0–0.996 μm. Furthermore, the thermal damage thickness range of laser machining in the air is 0.499–2.394 μm. It has also been found that the thermal damage thickness is greatest at the entrance to the hole, decreasing as the distance from the entrance increases.

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Study on water-assisted laser ablation mechanism based on water layer characteristics

Cited by 24 publications

References 25 publications

Efficient Water-Assisted Glass Cutting with 355 nm Picosecond Laser Pulses

Efficient Water-Assisted Glass Cutting with 355 nm Picosecond Laser Pulses

Femtosecond Laser Cutting of 110–550 µm Thickness Borosilicate Glass in Ambient Air and Water

Experimental Study on Coaxial Waterjet-Assisted Laser Scanning Machining of Nickel-Based Special Alloy

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