Correlation between laser energetic parameters and magnetic properties of GO laminations under surface treatments with long, short or ultra-short pulsed lasers

Impact of Ultra-Short Pulsed Laser (USPL) Ablation Process on Separated Loss Coefficients of Grain Oriented Electrical Steels

“…In the following, we focused on two particular investigations: the impact of ablation on GO samples using a femtosecond laser with a various set of parameters (see Table 2) and the comparison between different types of laser processing by varying the pulse duration between nanosecond and femtosecond. In our study a pulse duration with some P hundreds of femtoseconds leads to the ablation effect, some nanoseconds result in the scribing effect, and some hundreds of nanoseconds result in the irradiation effect [4]. The three different pulse widths studied are defined by the energy contributions delivered by the laser in each case in Table 3.…”

“…The nanosecond laser used is an IPG pulsed ytterbium fiber laser operating at a wavelength of 1.064 µm. It delivers pulse duration between 4 ns (Short Pulse SP) and 200 ns (Long Pulse LP) [4]. Yet, the femtosecond laser involved is an Ytterbium Amplitude Laser (Ultra-Short Pulse USP) which operates at a wavelength of 1.03 µm with an adjustable pulse width between a few hundreds of fs and 10 ps.…”

“…ulsed Laser (PL) technology is a recent technique used to optimize the electromagnetic properties of Grain Oriented Electrical Steels (GOES) forming the cores of transformers and chokes [3]. Like the Continuous Wave process, the long and Short Pulsed Laser (SP) processes have been largely studied [4], [5]. The Ultra-Short Pulsed Laser (USPL) ablation technique remains unfamiliar for these electrical steels and its deterministic impact on the performance of these materials requires deep investigations.…”

Experimental impact of pulsed laser irradiation, scribing and ablation on 2-D scalar and vector magnetic losses and general properties of Grain-Oriented Electrical Steels

“…The samples have been laser treated with a pattern composed of distant parallel lines perpendicular to RD. The laser treatments were classified into three categories fully described in [7]: Irradiation (Irr., thermal effect), Scribing (Scrib., thermal effect and weak engravement due to melting), and Ablation (Abl., predominant engravement due to sublimation). All laser treatments were performed with the same fixed spot size.…”

“…Still, authors investigate the rotational behavior [3]- [4], its connection to unidirectional components and the dependence on the angle between applied field and the RD [5]. Meanwhile, few started to investigate the impact of an irradiation laser process on the rotational magnetic behavior of GOES [6] but recent advancement in laser technologies revealed new possibilities for beneficial laser treatments [7] that have not been investigated under rotational fields yet. The present paper includes an experimental study of three laser process configurations that are investigated and compared in terms of impacts on the power losses of GOES for both unidirectional (in RD, but also in the Transverse Direction (TD)) and rotational excitation fields.…”