Near-threshold femtosecond laser fabrication of one-dimensional subwavelength nanogratings on a graphite surface

Superimposed one-dimensional quasiperiodic gratings with multiple periods Λ≈110–800 nm well below or comparable to the pump laser wavelength of 744 nm, and ridge orientations perpendicular to the linear polarization of infrared femtosecond laser pulses, were fabricated after multiple near-threshold laser shots on a planar surface of quasimonocrystalline graphite in ambient airyesBelgorod State Universit

Plasma-mediated Nanosecond-Laser Generation of Si Nanoparticles in Water

Plasma-mediated nanosecond IR-laser ablation of Si in water was describe sublinear function mass loss by multi shot ablative and third-power function extinction coefficient of generated colloidal solutions of density laser intensity. The first addiction shows influence subcritical ablative plasma to ablative rate, also fast increase extinction coefficient of 100 nm size particles of silicon in colloidal solution implies plasma-mediated dissociation of the ablation products. Keywords: silicon nanoparticles, nanosecond laser ablation, sub-critical ablative plasma, extinction coefficient, scaling relationships, melt expulsio

АНАЛІТИЧНЕ ПІДГРУНТЯ ЗАБЕЗПЕЧЕННЯ ФІНАНСОВОЇ БЕЗПЕКИ СУБ’ЄКТІВ ГОСПОДАРЮВАННЯ (ANALYTICAL BASIS OF ECONOMIC AGENTS FINANCIAL SECURITY ENSURING)

У статті розглянуті питання аналітичного підґрунтя забезпечення фінансової безпеки суб’єктів господарювання на основі якісних і кількісних параметрів їх фінансового стану, які повинні сигналізувати про можливі загрози існуванню підприємства, відповідно й приймати обґрунтовані управлінські рішення попереджувального характеру. (The article discusses the analytical financial security of business entities on the basis of qualitative and quantitative parameters of their financial situation, which should signal the possible threats to the existence of the company that you can make informed management decisions preventive nature.

Femtosecond laser modification of titanium surfaces: direct imprinting of hydroxylapatite nanopowder and wettability tuning via surface microstructuring

Femtosecond laser modification of titanium surfaces was performed to produce microstructured hydrophilic and biocompatible surface layers. Biocompatible nano/microcoatings were prepared for the first time by dry femtosecond laser imprinting of hydroxylapatite nano/micropowder onto VT6 titanium surfacesyesBelgorod State Universit

Comparative Analysis of the Silver Nanoparticle’s Yield for Pico-Femto-Nanosecond Laser Generation

Comparative analysis of different laser regimes of silver nanoparticle generation in water was performed for laser pulsewidth in the range of 300 fs–100 ns. Optical spectroscopy, scanning electron microscopy, energy-dispersive X-ray spectroscopy and method of dynamic light scattering were used for nanoparticle characterization. Different laser regimes of generation were used with varying pulse duration, pulse energy and scanning velocity. The proposed universal quantitative criteria as productivity and ergonomicity of the obtained colloidal solutions of nanoparticles were investigated to compare different laser regimes of production. The efficiency per unit energy for picosecond generation of nanoparticles, free from the influence of nonlinear effects, turns out to be higher by 1–2 orders of magnitude than for nanosecond generation. © 2023 by the authors.Ministry of Education and Science of the Russian Federation, MinobrnaukaThis research was funded by the Ministry of Science and Higher Education of the Russian Federation (Ural Federal University Program of Development within the Priority-2030 Program)