The influence of roughness on reflectivity evolution of iron irradiated by 1064nm CW laser

Taotao Wu; Yongxiang Zhu; Chenghua Wei; Menlian Zhou; Lijun Wang

doi:10.1117/12.2267822

12 May 2017 The influence of roughness on reflectivity evolution of iron irradiated by 1064nm CW laser

Taotao Wu, Yongxiang Zhu, Chenghua Wei, Menlian Zhou, Lijun Wang

Proceedings Volume 10173, Fourth International Symposium on Laser Interaction with Matter; 1017321 (2017) https://doi.org/10.1117/12.2267822
Event: 4th International Symposium on Laser Interaction with Matter, 2016, Chengdu, China

Abstract

Reflectivity is an important physical quantity governing the effects of laser interaction with metal. It directly determines the energy deposition and the relevant thermal-mechanical response of metal. However, metal’s reflectivity is not constant, which will be significantly affected by the surface states, such as roughness and oxidation. Industrial grade polycrystalline iron substrates with different surface roughness were prepared. Samples were ground and polished using progressively finer SiC paper and polisher. The surface morphology and roughness were determined by a 3D microscope. The surface roughness values of these samples varied from 0.08 μm to 2.65 μm. The reflectivity of samples at 1064nm were measured by an integral sphere equipped an InGaAs detector. The reflectivity values increased from 0.52 to 0.70 as the roughness decreasing. Later on, samples were irradiated by 1064nm continuous wave fiber laser in the intensity of 2 W/cm². The real time reflectivity during laser illumination was also measured. As the samples’ temperature rising, the surface oxidation reaction took place. The reflectivity evolved because of the molecular absorption and interfere effect of the oxides. The phenomena of reflectivity evolution were more obvious as samples smoother. Although the initial reflectivity of samples was different, samples show the same final reflectivity after laser irradiation.

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Taotao Wu, Yongxiang Zhu, Chenghua Wei, Menlian Zhou, and Lijun Wang "The influence of roughness on reflectivity evolution of iron irradiated by 1064nm CW laser", Proc. SPIE 10173, Fourth International Symposium on Laser Interaction with Matter, 1017321 (12 May 2017); https://doi.org/10.1117/12.2267822

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KEYWORDS

Reflectivity

Metals

Iron

Polishing

Surface roughness

Surface finishing

Laser irradiation

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