Research on Microhole Processing Technology Based on the Femtosecond-Laser Spiral Trepanning Method

Li, Fengping; Gao, Feng; Yang, Xiaojun; Li, Yong; Ma, Guang; Lu, Chengji

doi:10.3390/app10217508

Cited by 5 publications

(2 citation statements)

References 26 publications

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“…diameters and depths ⩾1 mm) using fs lasers through conventional two-dimensional (2D) galvo scanners or translation stages (figures 1(a)-(j)), which are the two major obstacles to reaching high precisions (e.g. <10 µm) [16][17][18][19][20][21][22]. Significant research efforts have been made to investigate separate parameters (e.g.…”

Section: Introductionmentioning

confidence: 99%

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Femtosecond-laser sharp shaping of millimeter-scale geometries with vertical sidewalls

Zhu

Fan

et al. 2021

Int. J. Extrem. Manuf.

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As femtosecond (fs) laser machining advances from micro/nanoscale to macroscale, approaches capable of machining macroscale geometries that sustain micro/nanoscale precisions are in great demand. In this research, an fs laser sharp shaping approach was developed to address two key challenges in macroscale machining (i.e. defects on edges and tapered sidewalls). The evolution of edge sharpness (edge transition width) and sidewall tapers were systematically investigated through which the dilemma of simultaneously achieving sharp edges and vertical sidewalls were addressed. Through decreasing the angle of incidence (AOI) from 0° to −5°, the edge transition width could be reduced to below 10 µm but at the cost of increased sidewall tapers. Furthermore, by analyzing lateral and vertical ablation behaviors, a parameter-compensation strategy was developed by gradually decreasing the scanning diameters along depth and using optimal laser powers to produce non-tapered sidewalls. The fs laser ablation behaviors were precisely controlled and coordinated to optimize the parameter compensations in general manufacturing applications. The AOI control together with the parameter compensation provides a versatile solution to simultaneously achieve vertical sidewalls as well as sharp edges of entrances and exits for geometries of different shapes and dimensions. Both mm-scale diameters and depths were realized with dimensional precisions below 10 µm and surface roughness below 1 µm. This research establishes a novel strategy to finely control the fs laser machining process, enabling the fs laser applications in macroscale machining with micro/nanoscale precisions.

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Section: Introductionmentioning

confidence: 99%

“…Significant research efforts have been made to investigate separate parameters (e.g. laser power, scan speed, focal positions, angle of incidence (AOI), hatching paths, ambient environment, etc), with optimal processing conditions being identified [18][19][20][21][22].…”

Section: Introductionmentioning

confidence: 99%