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Spatial and time characteristics of a four-wave radiation converter in a parabolic waveguide with resonant nonlinearity 谐振非线性抛物波导中四波辐射变换器的时空特性
IF 1
Computer Optics Pub Date : 2023-02-01 DOI: 10.18287/2412-6179-co-1199
E. Vorobeva, V. V. Ivakhnik, D. R. Kapizov
{"title":"Spatial and time characteristics of a four-wave radiation converter in a parabolic waveguide with resonant nonlinearity","authors":"E. Vorobeva, V. V. Ivakhnik, D. R. Kapizov","doi":"10.18287/2412-6179-co-1199","DOIUrl":"https://doi.org/10.18287/2412-6179-co-1199","url":null,"abstract":"Spatial and temporal characteristics of a degenerate four-wave converter in a multimode waveguide with resonant nonlinearity in a scheme with counter-pumping waves are analyzed using the time response function and the point spread function. For single-mode pump waves with equal mode numbers, the dependences of the time response width on the waveguide length, the intensity of the first pump waves, and the mode number in the mode expansion of the object wave amplitude are obtained for the four-wave converter. The greatest contribution to the object wave amplitude is shown to be from the waveguide mode whose number coincides with the mode number of single-mode pump waves. For the stationary model, taking into account the spatial structure of the Gaussian pump wave leads to a monotonous decrease with a decrease in the pump beam width, followed by a constant value of the PSF module width. With single-mode pump waves with equal mode numbers, An increase in the mode number of the pump waves leads to a redistribution of energy concentrated in the side maxima of the point signal image and improvement in the quality of the wavefront reversal for a model with single-mode pump waves with equal mode numbers.","PeriodicalId":46692,"journal":{"name":"Computer Optics","volume":null,"pages":null},"PeriodicalIF":1.0,"publicationDate":"2023-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89179680","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Modeling of spontaneous emission in presence of cylindrical nanoobjects: the scattering matrix approach 圆柱形纳米物体存在下的自发发射建模:散射矩阵法
IF 1
Computer Optics Pub Date : 2023-02-01 DOI: 10.18287/2412-6179-co-1143
V. V. Nikolaev, E. I. Girshova, M. Kaliteevski
{"title":"Modeling of spontaneous emission in presence of cylindrical nanoobjects: the scattering matrix approach","authors":"V. V. Nikolaev, E. I. Girshova, M. Kaliteevski","doi":"10.18287/2412-6179-co-1143","DOIUrl":"https://doi.org/10.18287/2412-6179-co-1143","url":null,"abstract":"We propose a method of analysis of spontaneous emission of a quantum emitter (an atom, a luminescence center, a quantum dot) inside or in vicinity of a cylinder. At the focus of our method are analytical expressions for the scattering matrix of the cylindrical nanoobject. We propose the approach to electromagnetic field quantization based of eigenvalues and eigenvectors of the scattering matrix. The method is applicable for calculation and analysis of spontaneous emission rates and angular dependences of radiation for a set of different systems: semiconductor nanowires with quantum dots, plasmonic nanowires, cylindrical hollows in dielectrics and metals. Relative simplicity of the method allows obtaining analytical and semi-analytical expressions for both cases of radiation into external medium and into guided modes.","PeriodicalId":46692,"journal":{"name":"Computer Optics","volume":null,"pages":null},"PeriodicalIF":1.0,"publicationDate":"2023-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78509323","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Reverse energy flow in vector modes of optical fibers 光纤矢量模式的反向能量流
IF 1
Computer Optics Pub Date : 2023-02-01 DOI: 10.18287/2412-6179-co-1229
S. Stafeev, A. D. Pryamikov, G. Alagashev, V. Kotlyar
{"title":"Reverse energy flow in vector modes of optical fibers","authors":"S. Stafeev, A. D. Pryamikov, G. Alagashev, V. Kotlyar","doi":"10.18287/2412-6179-co-1229","DOIUrl":"https://doi.org/10.18287/2412-6179-co-1229","url":null,"abstract":"In this paper, the propagation of a second-order cylindrical vector beam in gradient-index and microstructured fibers is numerically simulated using the RSoft Fullwave software. The second-order vector beams are shown to be vector modes of these fibers. In the calculated fundamental modes, regions are found in which there is an energy flow directed oppositely to the beam propagation direction (regions of a reverse energy flow). The absolute value of the longitudinal component of the reverse energy flow is found to be much lower than that of the forward flow.","PeriodicalId":46692,"journal":{"name":"Computer Optics","volume":null,"pages":null},"PeriodicalIF":1.0,"publicationDate":"2023-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83144852","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Designing dual-band athermal refractive-lens IR objectives 双频非热折射透镜红外物镜的设计
IF 1
Computer Optics Pub Date : 2022-12-01 DOI: 10.18287/2412-6179-co-1167
G. I. Greĭsukh, E. G. Ezhov, I. A. Levin
{"title":"Designing dual-band athermal refractive-lens IR objectives","authors":"G. I. Greĭsukh, E. G. Ezhov, I. A. Levin","doi":"10.18287/2412-6179-co-1167","DOIUrl":"https://doi.org/10.18287/2412-6179-co-1167","url":null,"abstract":"The possibility of achieving superior optical characteristics and passive athermalization in dual-band IR objectives of a simple design is shown. This is ensured, in particular, by using refractive lenses made of chalcogenide glasses in the optical scheme. Recommendations regarding the layout of the optical scheme and obtaining initial design parameters for the subsequent optimization are given. The reliability and effectiveness of the recommendations are confirmed by the results of designing a super-aperture refractive-lens objective operating in the mid- and long-IR subranges and forming a high-quality polychromatic image on the matrix of an uncooled microbolometer in the operating temperature range from – 40°C to + 60°C.","PeriodicalId":46692,"journal":{"name":"Computer Optics","volume":null,"pages":null},"PeriodicalIF":1.0,"publicationDate":"2022-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77276954","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Measurement of the radius of curvature of a spherical surface based on the transport-of-intensity equation 基于强度传递方程的球面曲率半径的测量
IF 1
Computer Optics Pub Date : 2022-12-01 DOI: 10.18287/2412-6179-co-1159
N. Stsepuro, M. Kovalev, G. Krasin, I. Gritsenko, A. V. Bobkov, S. I. Kudryashov
{"title":"Measurement of the radius of curvature of a spherical surface based on the transport-of-intensity equation","authors":"N. Stsepuro, M. Kovalev, G. Krasin, I. Gritsenko, A. V. Bobkov, S. I. Kudryashov","doi":"10.18287/2412-6179-co-1159","DOIUrl":"https://doi.org/10.18287/2412-6179-co-1159","url":null,"abstract":"The transport-of-intensity equation provides a new non-interferometric and non-iterative access to quantitative information about the phase of a light wave by measuring intensity distributions. This equation can be used to implement a simple and accurate spatial phase measurement for optical testing of spherical surfaces. The method requires only a CMOS camera, which records transverse field intensity distributions in several planes. Processing of experimental measurements with specialized software allows one to reconstruct the value of the radius of curvature of the spherical surface under test with high accuracy. The method is compared with measurements made by an interferometer, showing the difference between the values of the surface radius of curvature to be 0.01 % or less and indicating good agreement of the results.","PeriodicalId":46692,"journal":{"name":"Computer Optics","volume":null,"pages":null},"PeriodicalIF":1.0,"publicationDate":"2022-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90258409","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Double Laguerre-Gaussian beams 双拉盖尔-高斯光束
IF 1
Computer Optics Pub Date : 2022-12-01 DOI: 10.18287/2412-6179-co-1177
V. Kotlyar, E. Abramochkin, A. Kovalev, A. Savelyeva
{"title":"Double Laguerre-Gaussian beams","authors":"V. Kotlyar, E. Abramochkin, A. Kovalev, A. Savelyeva","doi":"10.18287/2412-6179-co-1177","DOIUrl":"https://doi.org/10.18287/2412-6179-co-1177","url":null,"abstract":"We show here that the product of two Laguerre-Gaussian (LG) beams, i.e. double LG beams (dLG), can be represented as finite superposition of conventional LG beams with certain coeffi-cients that are expressed via zero-argument Jacobi polynomials. This allows obtaining an explicit expression for the complex amplitude of the dLG beams in the Fresnel diffraction zone. Generally, such beams do not retain their structure, changing shape upon free-space propagation. However, if both LG beams are of the same order, we obtain a special case of a \"squared\" LG beam, which is Fourier-invariant. Another special case of the dLG beams is obtained when the azimuthal indices of the Laguerre polynomials are equal to n – m and n + m. For such a beam, an explicit expression is obtained for the complex amplitude in the Fourier plane. We show that if the lower indices of the constituent LG beams are the same, such a double LG beam is also Fourier-invariant. Similar to conventional LG beams, the product of LG beams can be used for optical data transmission, since they are characterized by azimuthal orthogonality and carry an orbital angular momentum equal to the topological charge.","PeriodicalId":46692,"journal":{"name":"Computer Optics","volume":null,"pages":null},"PeriodicalIF":1.0,"publicationDate":"2022-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78349312","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 2
Can the radial number of vortex modes control the orbital angular momentum? 涡旋模的径向数能控制轨道角动量吗?
IF 1
Computer Optics Pub Date : 2022-12-01 DOI: 10.18287/2412-6179-co-1169
A. Volyar, E. Abramochkin, M. Bretsko, Y. Akimova, Y. Egorov
{"title":"Can the radial number of vortex modes control the orbital angular momentum?","authors":"A. Volyar, E. Abramochkin, M. Bretsko, Y. Akimova, Y. Egorov","doi":"10.18287/2412-6179-co-1169","DOIUrl":"https://doi.org/10.18287/2412-6179-co-1169","url":null,"abstract":"In general, a standard Laguerre–Gauss (LG) beam, whose state is given by two quantum numbers (n, 𝓁): the radial number n and the azimuthal number 𝓁 (or the topological charge (TС) of the vortex carried by the LG beam), is unstable with respect to weak perturbations. This is not difficult to see if we decompose the complex amplitude of the LG beam in terms of Hermite–Gauss modes (HG), with the total number of HG modes being equal to N = 2n +𝓁 + 1. If we now slightly change the amplitudes and phases of each HG mode, then the structure of the LG beam radically changes. Such a combination of modes is called a structured LG beam (sLG), which can carry large additional arrays of information embedded in the sLG beam by encoding the amplitudes and phases of the HG modes (excitation of modes). But as soon as a perturbation is inserted into the LG beam, its orbital angular momentum (OAM) can change dramatically in such a way that the value of the OAM changes in the interval (–𝓁, 𝓁), and the total TC – in the interval (–2n – 𝓁, 2n + 𝓁). At n = 0, the OAM changes smoothly in the interval (–𝓁, 𝓁), however it is worth \"turning on\" the radial number n, as the OAM oscillations occur. The number of minima (maxima) of the oscillations is equal to the radial number n in the interval θ = (0, π) and θ = (π, 2π), with their amplitude nonlinearly depending on the difference 𝓁 – n, except for the point θ = π, where the structured beam becomes degenerate. If 𝓁 = 0, then the OAM is zero, so that in the sLG beam structure, we observe either a symmetrical array of vortices with opposite-sign TCs or a pattern of edge dislocations, the number of which is equal to the radial number n. We also found that, despite the fast oscillations of the OAM, the absolute value of the total TC of the sLG beam does not change with variation of both the amplitude ε and phase θ parameters, but depends solely on the initial state (n, 𝓁) of the LG beam and modulo (2n + 𝓁).","PeriodicalId":46692,"journal":{"name":"Computer Optics","volume":null,"pages":null},"PeriodicalIF":1.0,"publicationDate":"2022-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74939813","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 4
Topological charge of superposition of optical vortices described by a geometric sequence 用几何序列描述的光学涡旋叠加的拓扑电荷
IF 1
Computer Optics Pub Date : 2022-12-01 DOI: 10.18287/2412-6179-co-1152
V. Kotlyar, A. Kovalev
{"title":"Topological charge of superposition of optical vortices described by a geometric sequence","authors":"V. Kotlyar, A. Kovalev","doi":"10.18287/2412-6179-co-1152","DOIUrl":"https://doi.org/10.18287/2412-6179-co-1152","url":null,"abstract":"Here, we investigate coaxial superpositions of Gaussian optical vortices that can be described by a geometric sequence. For all superpositions analyzed, a topological charge (TC) is derived. In the initial plane, the TC can be either integer or half-integer, acquiring an integer value upon free-space propagation of the light field. Generally, the geometric sequence of optical vortices (GSOV) has three integer parameters and one real parameter. Values of these four parameters define the TC of the GSOV. Upon free-space propagation, the intensity pattern of the GSOV is not conserved, but can have intensity petals whose number is equal to one of the four beam parameters. If the GSOV has a unit real parameter, all constituent angular harmonics in the superposition have the same weight. In this case, the TC of the superposition is equal to the average index of the constituent angular harmonics. For instance, if the TC of the first and of the last angular harmonics, respectively, equals k and n, then the total TC of the superposition in the initial plane will be (n + k) /2, becoming equal to n upon free-space propagation.","PeriodicalId":46692,"journal":{"name":"Computer Optics","volume":null,"pages":null},"PeriodicalIF":1.0,"publicationDate":"2022-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90892660","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Conditions for correcting third-order spherical aberration in a ball lens with spherical refractive index distribution 球面折射率分布球透镜三阶球像差的校正条件
IF 1
Computer Optics Pub Date : 2022-12-01 DOI: 10.18287/2412-6179-co-1104
R. Ilinsky
{"title":"Conditions for correcting third-order spherical aberration in a ball lens with spherical refractive index distribution","authors":"R. Ilinsky","doi":"10.18287/2412-6179-co-1104","DOIUrl":"https://doi.org/10.18287/2412-6179-co-1104","url":null,"abstract":"A ball lens is analyzed. The refractive index of this lens is a function of the distance from the ball center. Conditions are derived under which such a lens is free of the third-order spherical aberration given a beam of incident parallel rays.","PeriodicalId":46692,"journal":{"name":"Computer Optics","volume":null,"pages":null},"PeriodicalIF":1.0,"publicationDate":"2022-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89075587","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Formation of high-order cylindrical vector beams with sector sandwich structures 扇形夹层结构高阶圆柱矢量梁的形成
IF 1
Computer Optics Pub Date : 2022-10-01 DOI: 10.18287/2412-6179-co-1096
S. Karpeev, V. Podlipnov, S. Degtyarev, A. Algubili
{"title":"Formation of high-order cylindrical vector beams with sector sandwich structures","authors":"S. Karpeev, V. Podlipnov, S. Degtyarev, A. Algubili","doi":"10.18287/2412-6179-co-1096","DOIUrl":"https://doi.org/10.18287/2412-6179-co-1096","url":null,"abstract":"Complex polarization-phase transformations are considered, which are implemented using easy-to-manufacture optical elements. The manufacturing technology of such elements is based on the axially symmetric discretization of the required polarization and phase distributions. This representation leads to optical elements in the form of sector sandwich structures consisting of polarizing and phase plates stacked together. The paper numerically and experimentally investigates the main types of such sector sandwich structures for the formation of second-order cylindrical polarizations.","PeriodicalId":46692,"journal":{"name":"Computer Optics","volume":null,"pages":null},"PeriodicalIF":1.0,"publicationDate":"2022-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80892768","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
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