The control of fundamental optical properties, such as transmission and reflection, over metallic surfaces plays a significant role in multiple fields like solar cells and aerospace. The direct laser etching in air can perform a variety of flexible control abilities in optical functional metal surfaces. In this paper, we use the aluminium alloy as an example of widely metal materials and propose two kinds of controlling strategies: large-range controlling strategy and small-range precise controlling strategy. The former changes the process repeat number of femtosecond laser or the scanning speed of nanosecond laser. The latter combines femtosecond laser and nanosecond laser. The results show that when the process repeat number of femtosecond laser is changed from 30 to 1, the height of the induced micro-pillars on the surface of Al alloy is changed from 80µm to 6µm. As a result, the reflectivity of samples will change from ∼16% to ∼87%. The nanosecond-laser-induced micro/nano structures achieve the reflectivity changing from ∼18% to ∼79% when the scanning speed changes from 10mm/s to 400mm/s in spectrum range of 250∼2000 nm. What’s, more, after being fabricated in the way of two-step controlling strategy, the reflectivity raises from ∼30% to ∼40% when the scanning speed of nanosecond laser changes from 10mm/s to 200mm/s, while the reflectivity of samples fabricated simply by nanosecond laser changes from ∼18% to ∼66% when the scanning speed changes in the same range and other parameters are kept the same. In addition, we demonstrated that the two-step precise controlling strategy is applicable to variety metals such as copper, stainless steel and titanium.
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ICALEO 2018: 37th International Congress on Applications of Lasers & Electro-Optics
October 14–18, 2018
Orlando, Florida, USA
ISBN:
978-1-940168-18-0
PROCEEDINGS PAPER
Flexible control over optical reflection property of metallic surfaces via pulse laser Available to Purchase
Xiao Luo;
Xiao Luo
Laser Materials Processing Research Centre, School of Materials Science and Engineering, Tsinghua University
, Beijing 100084, China
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Mingyong Cai;
Mingyong Cai
Laser Materials Processing Research Centre, School of Materials Science and Engineering, Tsinghua University
, Beijing 100084, China
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Weijian Liu;
Weijian Liu
Laser Materials Processing Research Centre, School of Materials Science and Engineering, Tsinghua University
, Beijing 100084, China
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Changhao Chen;
Changhao Chen
Laser Materials Processing Research Centre, School of Materials Science and Engineering, Tsinghua University
, Beijing 100084, China
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Rui Pan;
Rui Pan
Laser Materials Processing Research Centre, School of Materials Science and Engineering, Tsinghua University
, Beijing 100084, China
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Hongjun Zhang;
Hongjun Zhang
Laser Materials Processing Research Centre, School of Materials Science and Engineering, Tsinghua University
, Beijing 100084, China
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Minlin Zhong
Minlin Zhong
Laser Materials Processing Research Centre, School of Materials Science and Engineering, Tsinghua University
, Beijing 100084, China
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Published Online:
October 01 2018
Citation
Xiao Luo, Mingyong Cai, Weijian Liu, Changhao Chen, Rui Pan, Hongjun Zhang, Minlin Zhong; October 14–18, 2018. "Flexible control over optical reflection property of metallic surfaces via pulse laser." Proceedings of the ICALEO 2018: 37th International Congress on Applications of Lasers & Electro-Optics. ICALEO 2018: 37th International Congress on Applications of Lasers & Electro-Optics. Orlando, Florida, USA. (pp. M204). ASME. https://doi.org/10.2351/7.0004068
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