The influence of laser fluences on surface properties, plasma formation, and microhardness of Mg-alloy

Ayub, Ambreen; Dawood, Asadullah; Umm-i-Kalsoom,; sultan, Sara; Duraihem, Faisal Z.; SannaUllah,; Malik, Qaiser; Javed, Muhammad; Asad Khan, Muhammad

doi:10.1016/j.nimb.2024.165295

Nuclear Instruments and Methods in Physics Research Section B:

2024

DOI: 10.1016/j.nimb.2024.165295

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The influence of laser fluences on surface properties, plasma formation, and microhardness of Mg-alloy

Ambreen Ayub,

Asadullah Dawood,

Umm-i-Kalsoom

et al.

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2024

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Cited by 2 publications

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Optimizing Cu-alloy surface characteristics through magnetic field-enhanced fs laser treatment

Dawood,

Bashir,

Khan

et al. 2024

AIP Advances

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We report here the effect of the magnetic field on plasma parameters and the surface structuring of the Cu alloy after fs laser irradiation. A Ti:Sapphire (800 nm, 35 fs, 1 KHz) laser is employed at various irradiances (0.011–0.117 PW/cm2) to generate plasma. A Transvers Magnetic Field (TMF) of strength 1.1 T is employed for plasma confinement. All the measurements were performed with and without TMF. The Cu plasma parameters, i.e., excitation temperature (Texc) and electron number sensity (ne), determined by laser-induced breakdown spectroscopy analysis, are higher in the presence of TMF. This magnetic field confinement of Cu plasma was studied analytically by evaluating thermal beta (βt), directional beta (βd), confinement radius (Rb), and diffusion time (td). To correlate Cu-alloy plasma parameters with surface modifications, field emission scanning electron microscope analysis is performed. It reveals the formation of low-spatial-frequency laser-induced periodic surface structures (LIPSSs) and high-spatial-frequency LIPSSs, along with agglomers and nano-rims formation. Distinct and well-defined structures are observed in the presence of a magnetic field. It is concluded that controlled surface structuring can be achieved through magnetic confinement, which enhances key plasma parameters. The technique has the potential for enhancing the fabrication of nano-gratings and field emitters, where spatial uniformity is critically important.

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Optimizing Cu-alloy surface characteristics through magnetic field-enhanced fs laser treatment

Dawood,

Bashir,

Khan

et al. 2024

AIP Advances

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Examining the role of magnetic fields in plasma behavior and surface evolution of a Mg alloy with varied irradiances in a femtosecond laser treatment

Dawood,

Khan,

Bashir

et al. 2024

Appl. Opt.

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This paper reports the effect of a magnetic field on plasma parameters and surface structuring of the Mg alloy after laser irradiation. Femtosecond pulses of a Ti:sapphire laser system (800 nm, 35 fs, 1 KHz) are employed as the source of irradiation at various irradiances ranging from 0.011PW/cm2 to 0.117PW/cm2 to generate ablated Mg-alloy plasma. A transvers magnetic field (TMF) of strength 1.1 Tesla is employed to confine laser generated Mg plasma. All the measurements are performed with and without TMF. The two plasma parameters, i.e., excitation temperature (Texc) and electron number density (n e ) of Mg plasma, have been evaluated by laser-induced breakdown spectroscopy (LIBS) analysis. It is observed that the values of Texc and n e of laser produced plasma (LPP) of the Mg alloy are higher in the presence of a magnetic field as compared to the field free case. Both show initially an increasing trend with increasing laser irradiance and after attaining their respective maxima a decreasing trend is observed with the further increase of irradiance. The magnetic confinement validity is confirmed by analytically evaluating thermal beta (β t ), directional beta (β d ), confinement radius (R b ), and diffusion time (t d ) for LPP of the Mg alloy. To correlate the LPP parameters of the Mg alloy with surface modifications a field emission scanning electron microscope (FE-SEM) analysis is performed. It was revealed that structures like laser-induced periodic surface structures (LIPSSs), agglomerates, islands, large sized bumps, along with channels and multiple ablative layers are observed. Distinct and well-defined surface structuring is observed in the presence of TMF as compared to the field free case. It is concluded that by applying an external magnetic field during laser irradiation, controlled material surface structuring is possible for fabrication of nanogratings and field emitters where spatial uniformity is critically important.

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The influence of laser fluences on surface properties, plasma formation, and microhardness of Mg-alloy

Cited by 2 publications

References 46 publications

Optimizing Cu-alloy surface characteristics through magnetic field-enhanced fs laser treatment

Optimizing Cu-alloy surface characteristics through magnetic field-enhanced fs laser treatment

Examining the role of magnetic fields in plasma behavior and surface evolution of a Mg alloy with varied irradiances in a femtosecond laser treatment

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