Results 21 to 30 of about 67,616 (299)
Photonics, 2023 In this paper, partially coherent radially polarized (RP) Laguerre-Gaussian (LG) rotationally symmetrical power-exponent phase vortex (RSPEPV) beams with the LG-correlated Schell-model (LGSM) were introduced.
Zhiyuan Ma +5 more
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High repetition rate green-pumped supercontinuum generation in calcium fluoride
Scientific Reports, 2021 We compare supercontinuum generation in $$\hbox {CaF}_2$$ CaF 2 crystal under tight and loose focusing of 150 fs, 515 nm second harmonic pulses from an amplified Yb:KGW laser at a repetition rate of 10 kHz.
Vaida Marčiulionytė +3 more
doaj +1 more source
Sensors, 2021 We discuss interesting effects that occur when strongly focusing light with mth-order cylindrical–circular polarization. This type of hybrid polarization combines properties of the mth-order cylindrical polarization and circular polarization.
Victor V. Kotlyar +3 more
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Toroidal Vortices of Energy in Tightly Focused Second-Order Cylindrical Vector Beams
Photonics, 2021 In this paper, we simulate the focusing of a cylindrical vector beam (CVB) of second order, using the Richards–Wolf formula. Many papers have been published on focusing CVB, but they did not report on forming of the toroidal vortices of energy (TVE) near
Sergey S. Stafeev +2 more
doaj +1 more source
Tight-focusing parabolic reflector schemes for petawatt lasers
Optics Express, 2023 A comparative study of three different tight-focusing schemes for high-power lasers is performed numerically. Using the Stratton-Chu formulation, the electromagnetic field in the vicinity of the focus is evaluated for a short-pulse laser beam incident upon an on-axis high numerical aperture parabola (HNAP), an off-axis parabola (OAP), and a ...
Simon Vallières +6 more
openaire +2 more sources
Photonics, 2022 In this paper, using the Richards–Wolf equations, the focusing of circularly polarized light with flat diffractive lenses is considered. It is shown that, as the numerical aperture (NA) of the lens increases, the size of the focal spot first decreases ...
Sergey S. Stafeev +2 more
doaj +1 more source
Experimental investigation of the energy backflow in the tight focal spot
Компьютерная оптика, 2020 Using two identical microobjectives with a numerical aperture NA = 0.95, we experimentally demonstrate that the on-axis intensity near the tight focal spot of an optical vortex with a topological charge 2 is zero for right-handed circular polarization ...
V.V. Kotlyar +4 more
doaj +1 more source
Vector Beams with Only Transverse Intensity at Focus
Applied Sciences, 2023 In this work, the tight focusing of vector beams with azimuthal polarization and beams with a V-line of polarization singularity (sector azimuthal polarization) was simulated numerically using the Richards–Wolf formulas.
Sergey S. Stafeev +4 more
doaj +1 more source
Minimal focal spot obtained by focusing circularly polarized light
Компьютерная оптика, 2023 In this paper, using the Richards-Wolf equations, we analyze focusing circularly polarized light with flat diffractive lenses. It is shown that as the numerical aperture of the lens increases, the size of the focal spot first decreases and then begins to
S.S. Stafeev, V.D. Zaitcev, V.V. Kotlyar
doaj +1 more source
Generation and tight focusing of hybridly polarized vector beams
Optics Express, 2010 We propose and experimentally demonstrate the generation of hybridly polarized beams by transmitting radially polarized light through a wave plate. We show that such beams span a closed circle on the surface of the Poincaré sphere whose center coincides with the center of the sphere.
Gilad M, Lerman +2 more
openaire +2 more sources