Stainless steel colouring using burst and biburst mode ultrafast laser irradiation

Gaidys, Mantas; Selskis, Algirdas; Gečys, Paulius; Gedvilas, Mindaugas

doi:10.1016/j.optlastec.2024.110561

Optics & Laser Technology

2024

DOI: 10.1016/j.optlastec.2024.110561

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Stainless steel colouring using burst and biburst mode ultrafast laser irradiation

Mantas Gaidys,

Algirdas Selskis,

Paulius Gečys

et al.

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2024

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Cited by 4 publications

References 41 publications

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Efficient Ablation, further GHz Burst Polishing, and Surface Texturing by Ultrafast Laser

Žemaitis,

Gečys,

Gedvilas

2024

Adv Eng Mater

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A large variety of ultrafast laser‐matter interaction regimes and different processed surface finishing qualities of stainless steel can be achieved by varying the laser processing parameters. The optimization of the laser fluence to the most efficient ablation also leads to the lowest surface roughness of the ablated material. High laser fluence together with a high pulse repetition rate leads to heat accumulation, which results in the formation of microstructures with various morphology and scales. The use of GHz bursts allows a rough stainless‐steel surface to be smoothed and even polished. In this work, the fast and high‐quality milling of 2.5D cavities was demonstrated. Laser beam spot optimization was used to increase the throughput of the high‐power laser (67.8 W), resulting in an ablation rate of 13 mm3/min. The complex cavities were produced by laser milling and cutting in layers. The formation of surface structures on stainless steel because of laser irradiation has been demonstrated. The possibilities of further GHz burst polishing were examined on previously laser‐milled stainless steel using with lowest possible surface roughness. The ability to polish the surface with microstructures below the original roughness was demonstrated by bursts of ultrashort pulses with a repetition rate in the GHz range. It has been demonstrated that mold milling in stainless steel designed for LED diffusers can be fabricated using a modern femtosecond laser source together with beam size optimization technique for efficient ablation with low surface roughness, layer‐by‐layer milling techniques, and GHz burst polishing techniques.This article is protected by copyright. All rights reserved.

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Efficient Ablation, further GHz Burst Polishing, and Surface Texturing by Ultrafast Laser

Žemaitis,

Gečys,

Gedvilas

2024

Adv Eng Mater

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Laser-induced color reversal on metal surfaces in acetic acid solution

Liao,

Zhu,

Hong

2024

Optics & Laser Technology

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Bi-stability in femtosecond laser ablation by MHz bursts

Žemaitis,

Gaidys,

Gečys

et al. 2024

Sci Rep

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In this work, a bi-stable behavior of laser ablation efficiency and quality was controlled by fluence and burst length. The plasma shielding of incoming laser radiation caused sudden jumps with a significant decrease in ablation efficiency for every even number of pulses in the burst. The attenuation of incoming laser radiation by plasma created by the previous pulse was incorporated into the toy model of burst ablation efficiency. The mathematical recurrence relation has been derived for the first time, binding ablation efficiency for the next pulse with the efficiency of the previous pulse, which predicts bi-stability, as well as sudden jumps occurring in ablation efficiency depending on the number of pulses in burst with the response to changes of the control parameter of peak laser fluence in the pulse. The modeling results using new recurrence relation showed stable and bi-stable ablation efficiency depending on burst fluence and the number of pulses, which agreed well with experimental data. The extremely efficient laser ablation has been achieved by optimizing the shielding effect using three pulses in the burst.

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Stainless steel colouring using burst and biburst mode ultrafast laser irradiation

Cited by 4 publications

References 41 publications

Efficient Ablation, further GHz Burst Polishing, and Surface Texturing by Ultrafast Laser

Efficient Ablation, further GHz Burst Polishing, and Surface Texturing by Ultrafast Laser

Laser-induced color reversal on metal surfaces in acetic acid solution

Bi-stability in femtosecond laser ablation by MHz bursts

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