Results 11 to 20 of about 560,798 (337)
EFFECT OF OPTICAL FIBER HYDROGEN LOADING ON THE INSCRIPTION EFFICIENCY OF CHIRPED BRAGG GRATINGS BY MEANS OF KrF EXCIMER LASER RADIATION [PDF]
Научно-технический вестник информационных технологий, механики и оптики, 2016 Subject of Research.We present comparative results of the chirped Bragg gratings inscription efficiency in optical fiber of domestic production with and without low-temperature hydrogen loading. Method.
Sergey V. Varzhel +3 more
doaj +1 more source
INSCRIPTION PROCESS RESEARCH AND OPTIMIZATION FOR SUPERIMPOSED FIBER BRAGG GRATINGS [PDF]
Научно-технический вестник информационных технологий, механики и оптики, 2017 Subject of Research. The paper presents the study of inscription process distinctive features for superimposed fiber Bragg gratings. We analyzed spectral characteristics changes of superposition segregated gratings that appear during inscription of ...
Kirill A. Konnov +6 more
doaj +1 more source
Phase Mask Pinholes as Spatial Filters for Laser Interference Lithography
Advanced Photonics Research, 2023 Laser resonators have outputs with Gaussian spatial beam profiles. In laser interference lithography (LIL), using such Gaussian‐shaped beams leads to an inhomogeneous exposure of the substrate. As a result, dimensions of lithography‐defined features vary
Giovanna Capraro +4 more
doaj +1 more source
Improved Exponential Phase Mask for Generating Defocus Invariance of Wavefront Coding Systems
Applied Sciences, 2022 Wavefront coding is an effective way to extend the depth of field of optical imaging systems. The invariant defocusing imaging feature can be obtained by adding a phase mask with a suitable form to the aperture of a typical optical system.
Jing Sheng +4 more
doaj +1 more source
PROTECTIVE COATINGS OF FIBER BRAGG GRATING FOR MINIMIZING OF MECHANICAL IMPACT ON ITS WAVELENGTH CHARACTERISTICS [PDF]
Научно-технический вестник информационных технологий, механики и оптики, 2015 The paper deals with the scheme for the study of the Bragg wavelength shift dependence on the applied tensile force. Samples of fiber Bragg gratings with different coatings have been studied: the restored acrylate coating, the heatshrinkable fusion ...
A. S. Munko +3 more
doaj +1 more source
Applied Sciences, 2023 Phase mask optimization is one of the critical steps in designing a wavefront coding system to extend the depth of field (DoF). As a classical phase mask, a cubic phase mask was taken as an example. An improved particle swarm optimization (PSO) algorithm
Zeyu Huang +4 more
doaj +1 more source
Trade-Off Asymmetric Profile for Extended-Depth-of-Focus Ocular Lens
Photonics, 2022 We explore the possibility of extending the depth of focus of an imaging lens with an asymmetric quartic phase-mask, while keeping the aberration within a relatively low level.
Lenny A. Romero +2 more
doaj +1 more source
Fourier phasing with phase-uncertain mask [PDF]
Inverse Problems, 2013 Fourier phasing is the problem of retrieving Fourier phase information from Fourier intensity data. The standard Fourier phase retrieval (without a mask) is known to have many solutions which cause the standard phasing algorithms to stagnate and produce wrong or inaccurate solutions.
Fannjiang, Albert, Liao, Wenjing
openaire +2 more sources
Recording of the Multiplexed Bragg Diffraction Gratings for Waveguides Using Phase Mask
Photonics, 2020 The paper describes a stable method for multiplexed recording of the Bragg diffraction gratings for waveguides using a phase mask. Diffraction waveguides in this experiment were made of photo-thermo-refractive glass.
Maria Shishova +3 more
doaj +1 more source
Extended Depth-of-Field of a Miniature Optical Endoscope Using Wavefront Coding
Applied Sciences, 2020 Endoscopic imaging is an indispensable tool for visual inspection of surfaces in hard-to-access places. The conventional optical endoscope only enables imaging the regions that lie close to the focal plane, and therefore improving the depth of field (DOF)
Lei Yang +6 more
doaj +1 more source