Results 11 to 20 of about 39,722 (316)

Optimized Quasi-Optical Mode Converter for TE_33,12 in 210 GHz Gyrotron [PDF]

Micromachines
This article discusses the design of a high-performance quasi-optical mode converter for the TE33,12 mode at 210 GHz. The conversion process is challenging due to a caustic-to-cavity radius ratio of approximately 0.41.
Hamid Sharif, Muhammad Haris Jamil, Wenlong He   +2 more
doaj   +2 more sources

Axicon imaging by scalar diffraction theory

, 2004
Axicons are optical elements that produce Bessel beams,i.e., long and narrow focal lines along the optical axis. Thenarrow focus makes them useful ine.g. alignment, harmonicgeneration, and atom trapping, and they are also used toincrease the longitudinal range of applications such astriangulation, light sectioning, and optical coherencetomography.
Anna Burvall
openalex   +2 more sources

Effect of Grating Ruling Machine System Errors on Grating Spectral Performance

Applied Sciences, 2022
Grating groove functions scalar theory can describe the light source through the grating interference and diffraction effect of the physical phenomenon of splitting light.
Chao Yang, Xu Chen
doaj   +1 more source

Numerical simulation of the performance of a spaceborne Offner imaging hyperspectrometer in the wave optics approximation

Компьютерная оптика, 2022
We propose a method for calculating the point scattering function (PSF) of an Offner imaging hyperspectrometer with a diffraction grating in the approximation of scalar diffraction theory.
A.A. Rastorguev, S.I. Kharitonov, N.L. Kazanskiy   +2 more
doaj   +1 more source

Design of Multi-Wavelength Diffractive Lenses Focusing Radiation of Different Wavelengths to Different Points

Photonics, 2022
We propose a method for calculating the so-called multi-wavelength diffractive lenses (MWDLs) intended for separating and focusing the radiation of L given wavelengths to L given points located in a certain plane perpendicular to the optical axis.
Leonid L. Doskolovich, Roman V. Skidanov, Veronika A. Blank, Sofiya V. Ganchevskaya, Vladimir V. Podlipnov, Dmitry A. Bykov, Nikita V. Golovastikov, Evgeni A. Bezus   +7 more
doaj   +1 more source

Quasi-optical mode converter for a high power TE8,3-mode gyrotron

AIP Advances, 2022
We successfully developed a Gyrotron HS-III (28-GHz/400-kW/5-s) for electron cyclotron resonance heating in a spherical tokamak EXL-50, which operated in the TE8,3 mode. An internal quasi-optical-mode converter was designed to separate the spent electron
Qili Huang, Linlin Hu, Guowu Ma, Tingting Zhuo, Dimin Sun, Luqi Zhang, Jun Guo, Peng Hu, Yi Jiang, Hongbin Chen, Xiao Jin   +10 more
doaj   +1 more source

Design of Cascaded Diffractive Optical Elements for Optical Beam Shaping and Image Classification Using a Gradient Method

Photonics, 2023
We present a gradient method for designing cascaded diffractive optical elements (DOEs) consisting of several sequentially located phase DOEs. Using the unitarity property of the operator of light propagation through the cascaded DOE, we obtain explicit ...
Daniil V. Soshnikov, Leonid L. Doskolovich, Georgy A. Motz, Egor V. Byzov, Evgeni A. Bezus, Dmitry A. Bykov, Albert A. Mingazov   +6 more
doaj   +1 more source

Calculation of a diffractive lens having a fixed focal position at several prescribed wavelengths [PDF]

Компьютерная оптика, 2019
A method for calculating a “spectral” diffractive lens, which ensures the preservation of the focal position at several prescribed wavelengths is proposed.
Leonid Doskolovich, Evgeni Bezus, Dmitry Bykov, Roman Skidanov, Nikolay Kazanskiy   +4 more
doaj   +1 more source

Factors Affecting the Spatial Resolution in 2D Grating–Based X-Ray Phase Contrast Imaging

Frontiers in Physics, 2021
X-ray phase contrast imaging is a promising technique in X-ray biological microscopy, as it improves the contrast of images for materials with low electron density compared to traditional X-ray imaging. The spatial resolution is an important parameter to
Siwei Tao, Congxiao He, Xiang Hao, Cuifang Kuang, Cuifang Kuang, Xu Liu, Xu Liu   +6 more
doaj   +1 more source

Gradient method for designing cascaded DOEs and its application in the problem of classifying handwritten digits

Компьютерная оптика, 2023
We consider a gradient method for calculating cascaded diffractive optical elements (DOEs) consisting of several sequentially placed phase DOEs. Using the unitarity property of the operator describing the light propagation through the cascaded DOE, we ...
D.V. Soshnikov, L.L. Doskolovich, E.V. Byzov   +2 more
doaj   +1 more source