Результаты исследований: Научные публикации в периодических изданиях › статья › Рецензирование
Multi-wavelength anti-reflective laser-induced periodic surface structures (LIPSS) on BaGa4Se7 crystals. / Syubaev, Sergey A.; Cherepakhin, Artem B.; Gurbatov, Stanislav O. и др.
в: Applied Surface Science, Том 737, 166873, 15.08.2026.Результаты исследований: Научные публикации в периодических изданиях › статья › Рецензирование
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TY - JOUR
T1 - Multi-wavelength anti-reflective laser-induced periodic surface structures (LIPSS) on BaGa4Se7 crystals
AU - Syubaev, Sergey A.
AU - Cherepakhin, Artem B.
AU - Gurbatov, Stanislav O.
AU - Modin, Evgeny
AU - Shevlyagin, Aleksandr V.
AU - Yelisseyev, Aleksandr P.
AU - Krinitsin, Pavel G.
AU - Dostovalov, Aleksandr V.
AU - Gurevich, Evgeny L.
AU - Isaenko, Ludmila I.
AU - Kuchmizhak, Aleksandr A.
N1 - This work was supported by the Russian Science Foundation under grant no. 25-79-20014.
PY - 2026/8/15
Y1 - 2026/8/15
N2 - Nonlinear crystals for optical parametric conversion typically exhibit strong Fresnel reflection from the endfaces mediated by high material refractive index limiting optical coupling efficiency and device performance. Anti-reflective nanostructures engraved on the crystal endfaces offer promising alternative to gradient-index coatings lacking adhesion, thermal and mechanical stability, while enhanced transmittance at short-wave IR (SWIR) wavelengths requires high-resolution nanotexturing techniques. Here, based on the example of promising multi-component BaGa4Se7 crystals exhibiting broad transparency (0.5 – 17μm) and high nonlinear coefficient, we demonstrated applicability of direct femtosecond laser nanotexturing via self-organization to create anti-reflective nanostructures. In particular, we utilized visible (515 nm) and UV (257 nm) laser pulses to drive transient interference of incident light with surface and scattered waves imprinting nanogratings with wavelength-dependent morphology and subwavelength periodicity Λ=λ/1.3. Such nanogratings referred to as laser-induced periodic surface structures (LIPSS) produced over both crystal endfaces were found to provide 1.22-fold enhancement of the SWIR transmittance as evidenced from FTIR spectroscopy and power measurements of spectrally tunable laser radiation directly passing the crystal bulk. Our study sheds light on the LIPSS formation over nonlinear crystal surfaces highlighting laser-driven self-organization as a promising high-resolution nanofabrication technique for improving pump efficiency of nonlinear crystals.
AB - Nonlinear crystals for optical parametric conversion typically exhibit strong Fresnel reflection from the endfaces mediated by high material refractive index limiting optical coupling efficiency and device performance. Anti-reflective nanostructures engraved on the crystal endfaces offer promising alternative to gradient-index coatings lacking adhesion, thermal and mechanical stability, while enhanced transmittance at short-wave IR (SWIR) wavelengths requires high-resolution nanotexturing techniques. Here, based on the example of promising multi-component BaGa4Se7 crystals exhibiting broad transparency (0.5 – 17μm) and high nonlinear coefficient, we demonstrated applicability of direct femtosecond laser nanotexturing via self-organization to create anti-reflective nanostructures. In particular, we utilized visible (515 nm) and UV (257 nm) laser pulses to drive transient interference of incident light with surface and scattered waves imprinting nanogratings with wavelength-dependent morphology and subwavelength periodicity Λ=λ/1.3. Such nanogratings referred to as laser-induced periodic surface structures (LIPSS) produced over both crystal endfaces were found to provide 1.22-fold enhancement of the SWIR transmittance as evidenced from FTIR spectroscopy and power measurements of spectrally tunable laser radiation directly passing the crystal bulk. Our study sheds light on the LIPSS formation over nonlinear crystal surfaces highlighting laser-driven self-organization as a promising high-resolution nanofabrication technique for improving pump efficiency of nonlinear crystals.
KW - Anti-reflective nanostructures
KW - BaGa4Se7
KW - Femtosecond lasers
KW - Laser-induced periodic surface structures
KW - Nonlinear crystals
UR - https://www.scopus.com/pages/publications/105036447305
UR - https://www.mendeley.com/catalogue/29c31c55-04f3-3e09-a33e-eeabd1660575/
U2 - 10.1016/j.apsusc.2026.166873
DO - 10.1016/j.apsusc.2026.166873
M3 - Article
VL - 737
JO - Applied Surface Science
JF - Applied Surface Science
SN - 0169-4332
M1 - 166873
ER -
ID: 80150594