Impact of evolving surface nanoscale topologies in femtosecond laser structuring of Ni-based superalloy CMSX-4

Abstract : We investigate the role of surface nanoscale topographies in the inhomogeneous coupling of laser radiation to Ni-based superalloy CMSX-4 surfaces and in the formation of laser-induced periodic surface structures. The initial surface arbitrary roughness is already able, upon laser exposure, to induce low-spatial-frequency and high-spatial-frequency structures, actively determining an interference of incoming and scattered fields resulting in spatial energy modulation. A topology variation with the incoming dose via the number of pulses determines a correlated evolution in the regular ripple arrangements. The scattering pattern is severely influenced by the scattering source geometries. Therefore, we equally study experimentally the role of one-dimensional nanoscale grooves in determining polarization-dependent structuring patterns at increasing irradiation dose. Finally, the role of surface nanostructures in generating the surface modulation of deposited energy is analyzed by finite-difference-time-domain simulation. Ripple formation in multi-pulses is a result of the feedback process between light and nanostructures.
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https://hal-ujm.archives-ouvertes.fr/ujm-01260714
Contributor : Razvan Stoian <>
Submitted on : Friday, January 22, 2016 - 3:02:12 PM
Last modification on : Thursday, July 25, 2019 - 4:30:04 PM

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Li Chen, Guanghua Cheng, Jean-Philippe Colombier, Nicolas Faure, Stephanie Reynaud, et al.. Impact of evolving surface nanoscale topologies in femtosecond laser structuring of Ni-based superalloy CMSX-4. Journal of Optics, Institute of Physics (IOP), 2016, 18, pp.015402. ⟨10.1088/2040-8978/18/1/015402⟩. ⟨ujm-01260714⟩

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