Zobrazeno 1 - 10
of 58
pro vyhledávání: '"Alexey, Kovalev"'
Autor:
Bing Sun, Aida Andrades Valtueña, Arthur Kocher, Shizhu Gao, Chunxiang Li, Shuang Fu, Fan Zhang, Pengcheng Ma, Xuan Yang, Yulan Qiu, Quanchao Zhang, Jian Ma, Shan Chen, Xiaoming Xiao, Sodnomjamts Damchaabadgar, Fajun Li, Alexey Kovalev, Chunbai Hu, Xianglong Chen, Lixin Wang, Wenying Li, Yawei Zhou, Hong Zhu, Johannes Krause, Alexander Herbig, Yinqiu Cui
Publikováno v:
Nature Communications, Vol 15, Iss 1, Pp 1-12 (2024)
Abstract Hepatitis B virus is a globally distributed pathogen and the history of HBV infection in humans predates 10000 years. However, long-term evolutionary history of HBV in Eastern Eurasia remains elusive. We present 34 ancient HBV genomes dating
Externí odkaz:
https://doaj.org/article/6a6d9c3f1f9a47af8dafa8abfce34899
Publikováno v:
Компьютерная оптика, Vol 44, Iss 2, Pp 145-154 (2020)
An optical vortex passed through an arbitrary aperture (with the vortex center found within the aperture) or shifted from the optical axis of an arbitrary axisymmetric carrier beam is shown to conserve the integer topological charge (TC). If the beam
Externí odkaz:
https://doaj.org/article/bfb50886479c46b4896ad2dac1991ee6
Publikováno v:
Компьютерная оптика, Vol 43, Iss 6, Pp 917-925 (2019)
Here, we theoretically demonstrate that if a Gaussian optical vortex is distorted by a random phase screen (diffuser) then the average intensity distribution in the focus of a spherical lens has a form of a ring with a nonzero value on the optical ax
Externí odkaz:
https://doaj.org/article/124648e1782b4f1c9dcba9739724c469
Publikováno v:
Компьютерная оптика, Vol 43, Iss 6, Pp 1098-1102 (2019)
For a light field with both phase and polarization singularities at its center, expressions are obtained that describe the distribution of the spin angular momentum (SAM) density in the sharp focal spot of an aplanatic system. These expressions inclu
Externí odkaz:
https://doaj.org/article/a33dc2c603ef4923923930421568076c
Publikováno v:
Компьютерная оптика, Vol 43, Iss 5, Pp 735-740 (2019)
Here we study asymmetric Kummer beams (aK-beams) with their scalar complex amplitude being proportional to the Kummer function (a degenerate hypergeometric function). These beams are an exact solution of the paraxial propagation equation (Schrödinge
Externí odkaz:
https://doaj.org/article/c11e03eca648494494c7d644fc1fc76f
Publikováno v:
Компьютерная оптика, Vol 43, Iss 5, Pp 714-722 (2019)
It was theoretically shown that in the interference pattern of four plane waves with specially selected directions of linear polarization it is formed a reverse flow of energy. The areas of direct and reverse flow alternate in a staggered order in th
Externí odkaz:
https://doaj.org/article/50d2071e970e4725ad4f33be3dd3afb3
Publikováno v:
Компьютерная оптика, Vol 43, Iss 3, Pp 356-367 (2019)
Here we study three different types of astigmatic Gaussian beams, whose complex amplitude in the Fresnel diffraction zone is described by the complex argument Hermite polynomial of the order (n, 0). The first type is a circularly symmetric Gaussian o
Externí odkaz:
https://doaj.org/article/d6a65760b0f946cb85626ed35227de52
Publikováno v:
Компьютерная оптика, Vol 43, Iss 3, Pp 337-346 (2019)
Using the Richards-Wolf formalism, we obtain general expressions for all components of the electric and magnetic strength vectors near the sharp focus of an optical vortex with the topological charge m and nth-order azimuthal polarization. From these
Externí odkaz:
https://doaj.org/article/e82b7e16f3b8415da8de9bb949ccd13a
Autor:
Victor Kotlyar, Alexey Kovalev
Publikováno v:
Компьютерная оптика, Vol 43, Iss 1, Pp 54-62 (2019)
In this work, using an expansion in terms of plane waves, we obtain all six components of the electric and magnetic field vectors for an elliptically polarized optical vortex with an arbitrary integer topological charge. We also obtain expressions fo
Externí odkaz:
https://doaj.org/article/3ae10dede92d4cb281e2dcec0987309b
Publikováno v:
Компьютерная оптика, Vol 43, Iss 1, Pp 42-53 (2019)
We propose and study numerically and experimentally two methods for determining the orbital angular momentum (OAM) of paraxial laser beams. One method is based on registering the intensity in the Fresnel zone, numerically averaging this intensity ove
Externí odkaz:
https://doaj.org/article/5169331c9990491585e2e36e5db8af06