Laser drilling of high aspect ratio holes in copper with femtosecond, picosecond and nanosecond pulses

Weck, Arnaud; Crawford, T.H.R.; Wilkinson, David S.; Haugen, H.K.; Preston, J. S.

doi:10.1007/s00339-007-4300-6

Cited by 119 publications

(42 citation statements)

References 24 publications

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“…This can result in the enhanced residual heat effect discovered by Vorobyev and Guo [17], which depends on the ionization potential of ambient gas. However, laser energy absorbed by air and returned to the target after the laser beam action leads to reducing the processing quality [27,35,36]. The higher the laser beam fluence which could be reached on the surface in vacuum or low-density gas environment, the more laser energy is lost for air ionization (the larger is zcr and, hence, gas ionization volume).…”

Section: Other Effects Of Air Ionization At Femtosecond Laser Processingmentioning

confidence: 99%

Impacts of Ambient and Ablation Plasmas on Short- and Ultrashort-Pulse Laser Processing of Surfaces

et al. 2014

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Abstract:In spite of the fact that more than five decades have passed since the invention of laser, some topics of laser-matter interaction still remain incompletely studied. One of such topics is plasma impact on the overall phenomenon of the interaction and its particular OPEN ACCESSMicromachines 2014, 5 1345 features, including influence of the laser-excited plasma re-radiation, back flux of energetic plasma species, and massive material redeposition, on the surface quality and processing efficiency. In this paper, we analyze different plasma aspects, which go beyond a simple consideration of the well-known effect of plasma shielding of laser radiation. The following effects are considered: ambient gas ionization above the target on material processing with formation of a "plasma pipe"; back heating of the target by both laser-driven ambient and ablation plasmas through conductive and radiative heat transfer; plasma chemical effects on surface processing including microstructure growth on liquid metals; complicated dynamics of the ablation plasma flow interacting with an ambient gas that can result in substantial redeposition of material around the ablation spot. Together with a review summarizing our main to-date achievements and outlining research directions, we present new results underlining importance of laser plasma dynamics and photoionization of the gas environment upon laser processing of materials.

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Section: Other Effects Of Air Ionization At Femtosecond Laser Processingmentioning

confidence: 99%

Impacts of Ambient and Ablation Plasmas on Short- and Ultrashort-Pulse Laser Processing of Surfaces

et al. 2014

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“…Challenges related to producing high precision and high aspect ratio holes have been investigated [4]. Aspect ratios greater than 50 have been produced with high quality, usually by employing helical or trepanning drilling [5][6][7]. In addition to high precision and aspect ratios, high-speed drilling and micro drilling are utilized, especially in aerospace applications [8].…”

Section: Introductionmentioning

confidence: 99%

Comparison of Laser-Engraved Hole Properties between Cold-Rolled and Laser Additive Manufactured Stainless Steel Sheets

et al. 2017

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Laser drilling and laser engraving are common manufacturing processes that are found in many applications. With the continuous progress of additive manufacturing (3D printing), these processes can now be applied to the materials used in 3D printing. However, there is a lack of knowledge about how these new materials behave when processed or machined. In this study, sheets of 316L stainless steel produced by both the traditional cold rolling method and by powder bed fusion (PBF) were laser drilled by a nanosecond pulsed fiber laser. Results were then analyzed to find out whether there are measurable differences in laser processing parts that are produced by either PBF (3D printing) or traditional steel parts. Hole diameters, the widths of burn effects, material removal rates, and hole tapers were measured and compared. Additionally, differences in microstructures of the samples were also analyzed and compared. Results show negligible differences in terms of material processing efficiency. The only significant differences were that the PBF sample had a wider burn effect, and had some defects in the microstructure that were more closely analyzed. The defects were found to be shallow recesses in the material. Some of the defects were deep within the material, at the end and start points of the laser lines, and some were close to the surfaces of the sample.

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“…In the theoretical studies on femtosecond laser ablation of metal, most works have focused on two-temperature model (TTM) [1,[3][4][5] or hydrodynamic model [6]. Experiments with single-or multi-shot ablation or the drilling of metal under different laser parameters have also been presented, e.g., laser fluence [7][8][9] and pulse duration [10][11][12]. For example, the ablation rate of iron can be optimized by variation of the single pulse duration in the range of 0.3-3.6 ps [12].…”

Section: Introductionmentioning

confidence: 99%

Drilling of Copper Using a Dual-Pulse Femtosecond Laser

Cheng

Chen

2016

Technologies

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Abstract:The drilling of copper using a dual-pulse femtosecond laser with wavelength of 800 nm, pulse duration of 120 fs and a variable pulse separation time (0.1-150 ps) is investigated theoretically. A one-dimensional two-temperature model with temperature-dependent material properties is considered, including dynamic optical properties and the thermal-physical properties. Rapid phase change and phase explosion models are incorporated to simulate the material ablation process. Numerical results show that under the same total laser fluence of 4 J/cm 2 , a dual-pulse femtosecond laser with a pulse separation time of 30-150 ps can increase the ablation depth, compared to the single pulse. The optimum pulse separation time is 85 ps. It is also demonstrated that a dual pulse with a suitable pulse separation time for different laser fluences can enhance the ablation rate by about 1.6 times.

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Laser drilling of high aspect ratio holes in copper with femtosecond, picosecond and nanosecond pulses

Cited by 119 publications

References 24 publications

Impacts of Ambient and Ablation Plasmas on Short- and Ultrashort-Pulse Laser Processing of Surfaces

Impacts of Ambient and Ablation Plasmas on Short- and Ultrashort-Pulse Laser Processing of Surfaces

Comparison of Laser-Engraved Hole Properties between Cold-Rolled and Laser Additive Manufactured Stainless Steel Sheets

Drilling of Copper Using a Dual-Pulse Femtosecond Laser

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