**5. Conclusions**

Three radial laser beam profiles of the power density distribution (energy flux) were compared for laser powder bed fusion. The uniform cylindrical (flat-top) distribution (TEM01\* + TEM00 mode) was compared with the standard Laguerre–Gaussian law distribution TEM00 and the airy distribution of the first harmonic TEM01\* (TEM01 + TEM10 mode).

The TEM00 laser beam profile demonstrated the most effective result for a wide range of temperatures for thermos-activated processes such as laser powder bed fusion in the Péclet number range of 0–2.86, while the uniform cylindrical (flat-top) distribution is shown to be effective in a narrow temperature range. The inverse Gaussian (donut) laser beam distribution showed an interval result. With an increase in laser power, the transition from TEM00 to TEM01\* mode reduces the evaporation losses by more than 2.5 times, and it increases the absolute laser bandwidth when the relative bandwidth decreases by 24%.

The prospects of laser beam profiling for the purposes of increasing laser powder bed fusion productivity stay underestimated by the industry. However, they have a huge potential in the context of the switch to the sixth technological paradigm associated with Kondratieff's waves.

**Author Contributions:** Conceptualization, A.V.G. and S.N.G.; methodology, A.V.G.; software, A.S.G.; validation, A.S.M.; formal analysis, A.S.M. and T.V.T.; investigation, A.S.G. and T.V.T.; resources, T.V.T. and M.A.V.; data curation, A.A.O. and M.A.V.; writing—original draft preparation, A.A.O. and A.V.G.; writing—review and editing, A.V.G.; visualization, A.S.G., A.A.O. and A.V.G.; supervision, S.N.G.; project administration, S.N.G. and M.A.V.; funding acquisition, A.S.M. All authors have read and agreed to the published version of the manuscript.

**Funding:** This work was supported financially by the Ministry of Science and Higher Education of the Russian Federation (project No FSFS-2021-0003).

**Institutional Review Board Statement:** Not applicable.

**Informed Consent Statement:** Not applicable.

**Data Availability Statement:** Data are available in a publicly accessible repository.

**Acknowledgments:** The research was performed at the Department of High-Efficiency Processing Technologies of MSTU Stankin.

**Conflicts of Interest:** The authors declare no conflict of interest.
