Radiophysics and Quantum Electronics最新文献

{"title":"Features of Generating the Sum-Frequency Radiation Using Laser Pulses with Opposite Frequency Chirps","authors":"I. V. Kuz’min,&nbsp;S. Yu. Mironov,&nbsp;M. A. Martyanov,&nbsp;A. K. Potemkin","doi":"10.1007/s11141-024-10307-w","DOIUrl":"10.1007/s11141-024-10307-w","url":null,"abstract":"<p>We consider specific features of highly efficient generation of the second (eo-e and oe-o synchronism types) and third (oo-e synchronism type) harmonics using laser pulses with opposite frequency chirps for further application in electron photoinjectors. The relationships of the frequency chirps of the pulses interacting in a nonlinear crystal are obtained for the three-wave frequency summation process, which allow one to ensure high energy efficiency of the conversion and reproduce the spatiotemporal distribution of the intensity of the initial pulses in the generated signal.</p>","PeriodicalId":748,"journal":{"name":"Radiophysics and Quantum Electronics","volume":"66 5-6","pages":"460 - 468"},"PeriodicalIF":0.8,"publicationDate":"2024-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140597228","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Spectral Density of Spatial Noise of a Laser Beam Upon Reflection from a Non-Ideal Surface","authors":"E. A. Khazanov,&nbsp;A. A. Kochetkov,&nbsp;D. E. Silin","doi":"10.1007/s11141-024-10308-9","DOIUrl":"10.1007/s11141-024-10308-9","url":null,"abstract":"<p>We have studied the spectral properties of the inhomogeneities in the surface profile of a quartz plate in the spatial range from 10 μm to 100 mm on the basis of precision interferometric measurements. Analytical integral relations connecting one- and two-dimensional spectral densities of an isotropic random function, such as surface profile or spatial phase distribution of the laser beam, were obtained. It is shown that if the one-dimensional spectral density in a certain range of spatial frequencies decreases in a power-law manner, then the two-dimensional spectral density in the same range also decreases in a power-law manner with an exponent greater by one. The experimental data are in good agreement with the theoretical ones.</p>","PeriodicalId":748,"journal":{"name":"Radiophysics and Quantum Electronics","volume":"66 5-6","pages":"469 - 478"},"PeriodicalIF":0.8,"publicationDate":"2024-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140596958","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Reflectionless Acoustic Waves in an Inhomogeneous Atmosphere","authors":"N. S. Petrukhin,&nbsp;E. N. Pelinovsky,&nbsp;T. G. Talipova","doi":"10.1007/s11141-024-10305-y","DOIUrl":"10.1007/s11141-024-10305-y","url":null,"abstract":"<p>We study the vertical propagation of acoustic waves in a strongly inhomogeneous atmosphere. The class of monotonically varying profiles for the sound velocity, gas density, and gas pressure, for which acoustic waves can propagate with no reflection outside the framework of the classical WKB approximation, is found. This class of solutions, called reflectionless, is obtained by transforming the levels for waves in an ideal gas located in the gravity field into the Euler—Darboux—Poisson equation of a special kind, which has a solution in the form of a superposition of non-interacting waves propagating in opposite directions. It is noted that with this stratification, acoustic waves can have any frequency, in contrast to the exponential atmosphere, where the cutoff frequency is present.</p>","PeriodicalId":748,"journal":{"name":"Radiophysics and Quantum Electronics","volume":"66 5-6","pages":"431 - 440"},"PeriodicalIF":0.8,"publicationDate":"2024-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140596957","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Notes on the Acoustic Radiation Force","authors":"L. A. Ostrovsky","doi":"10.1007/s11141-024-10304-z","DOIUrl":"10.1007/s11141-024-10304-z","url":null,"abstract":"<p>We give an outline of selected theoretical and experimental studies associated with the periodaverage action of an oscillating acoustic field (acoustic radiation force) on the medium and microparticles. The main attention is paid to two problems related to biomedical research. One is the generation of shear waves by ultrasonic beams in weakly compressible (rubber-like) media, particularly in soft biological tissues. The other is the dynamics of microparticles in acoustic resonators. Some other aspects of the problem, such as bubble dynamics and acoustic levitation, are briefly mentioned. Elements of the history of early studies are also included.</p>","PeriodicalId":748,"journal":{"name":"Radiophysics and Quantum Electronics","volume":"66 5-6","pages":"421 - 430"},"PeriodicalIF":0.8,"publicationDate":"2024-03-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140325333","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Diffraction of Wave Beams from a Reflective Grating","authors":"S. N. Vlasov,&nbsp;E. V. Koposova","doi":"10.1007/s11141-024-10300-3","DOIUrl":"10.1007/s11141-024-10300-3","url":null,"abstract":"<p>We develop the theory of wave-beam diffraction from a reflective grating. The structures are found of the beams that are produced by diffraction of a wave beam from a reflective grating in the regime which is close to the self-collimation one with a high reflection coefficient. The structures of the beams reflected in the backward and mirror directions are presented.</p>","PeriodicalId":748,"journal":{"name":"Radiophysics and Quantum Electronics","volume":"66 5-6","pages":"345 - 356"},"PeriodicalIF":0.8,"publicationDate":"2024-03-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140314250","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"High-Intensity Acoustic Beams","authors":"O. V. Rudenko","doi":"10.1007/s11141-024-10298-8","DOIUrl":"10.1007/s11141-024-10298-8","url":null,"abstract":"<p>We present a brief overview of the theory of high-intensity nonlinear diffracting beams. Characteristic distortions of the profiles of acoustic waves, which are observed during the wave propagation, are described. The following features are pointed out. First, the positive and negative half periods of the original harmonic signal are differently distorted. The positive-pressure phase duration is shortened and its “amplitude” is increased. On the contrary, the region of negative pressure is somewhat extended and reduced in “amplitude.” Second, the profiles are shifted to the region of negative values of the “accompanying” time, i.e., the diffraction of a convex beam leads to a slight increase in its propagation velocity. In addition, the positive pressure in some range of distances may exceed the initial value. Low-frequency geometric dispersion leads to differentiation of the weak signal profile in the focal region and in the far zone, which leads to the disappearance of unipolar video pulses. A stationary wave composed of sections of a parabolic shape can be formed in the waist. The limiting values of acoustic pressure and wave intensity in the focus are estimated. Approximate mathematical methods and the models used in the calculation of the wave profiles are described.</p>","PeriodicalId":748,"journal":{"name":"Radiophysics and Quantum Electronics","volume":"66 5-6","pages":"321 - 332"},"PeriodicalIF":0.8,"publicationDate":"2024-03-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140314745","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Toroidal Vector Dissipative Optical Solitons with Polarization Singularities","authors":"N. A. Veretenov,&nbsp;N. N. Rosanov,&nbsp;S. V. Fedorov","doi":"10.1007/s11141-024-10303-0","DOIUrl":"10.1007/s11141-024-10303-0","url":null,"abstract":"<p>We have found a new class of three-dimensional vector laser solitons within the framework of the quasi-optical approximation (parabolic equation) for a medium with a fast response of nonlinear amplification and absorption by numerical modeling. These solitons have different polarization singularities. The range of parameters in which solitons are stable is studied, and scenarios of destabilization when leaving this range are indicated.</p>","PeriodicalId":748,"journal":{"name":"Radiophysics and Quantum Electronics","volume":"66 5-6","pages":"408 - 420"},"PeriodicalIF":0.8,"publicationDate":"2024-03-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140314508","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Nonlinear-Diffusion (Burgers) and Quasioptics Equations. Projective and Lens Transformations","authors":"S. N. Gurbatov","doi":"10.1007/s11141-024-10299-7","DOIUrl":"10.1007/s11141-024-10299-7","url":null,"abstract":"<p>We discuss the common properties of and the differences between the exact solution of the Burgers equation (the Cole–Hopf solution) and the asymptotic solution of the parabolic equation of quasioptics (the geometrical-optics approximation). It is shown how the application of the modified lens transformation (Talanov transformation) allows one to consider several problems of the nonlinear interaction of intense acoustic waves having essentially different time scales.</p>","PeriodicalId":748,"journal":{"name":"Radiophysics and Quantum Electronics","volume":"66 5-6","pages":"333 - 344"},"PeriodicalIF":0.8,"publicationDate":"2024-03-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140314344","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Dynamics of the Self-Action of Wave Fields in Multicore Fibers","authors":"A. A. Balakin,&nbsp;S. A. Skobelev,&nbsp;A. V. Andrianov,&nbsp;A. G. Litvak","doi":"10.1007/s11141-024-10302-1","DOIUrl":"10.1007/s11141-024-10302-1","url":null,"abstract":"<p>We review modern studies of the self-action of laser radiation in discrete systems using the example of multicore fibers. The critical power is shown to exist, at which the self-trapping (the discrete analog of collapse) of radiation occurs even in a one-dimensional lattice of weakly coupled cores. The transition of nonlinear dynamics to the stochastic regime in discrete systems is studied, and the threshold amplitude for this transition is determined. It is shown that the use of a special configuration with a dedicated core in the center of a ring of identical cores makes it possible to control the self-trapping process and apply it for nonlinear radiation filtering and self-compression of laser pulses. It is established that arbitrarily powerful coherent radiation can be handled using stable out-of-phase supermodes, which are wave-field distributions over all fiber cores with a maximum propagation constant. Such out-of-phase supermodes are demonstrated for core configurations shaped as a ring, a line, a square matrix, and a hexagonal structure. The first experiments have already shown the feasibility and stability of the found out-of-phase supermodes, in both fibers with a ring configuration and fibers having a square matrix of cores.</p>","PeriodicalId":748,"journal":{"name":"Radiophysics and Quantum Electronics","volume":"66 5-6","pages":"370 - 407"},"PeriodicalIF":0.8,"publicationDate":"2024-03-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140314462","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Quasiclassical Dynamics of Nonlinear Wave Systems","authors":"E. A. Kuznetsov","doi":"10.1007/s11141-024-10297-9","DOIUrl":"10.1007/s11141-024-10297-9","url":null,"abstract":"<p>The paper presents a brief review of the quasiclassical wave dynamics for the nonlinear Schrödinger equation (NLSE) as applied to focusing and defocusing media. The NLSE depends significantly on the space dimension d. The two-dimensional NLSE has an additional symmetry of the conformal type with respect to the Talanov transformations (Talanov in JETP Lett. 11:199–201, 1970), which were initially found for the stationary self-focusing in a medium with the Kerr nonlinearity. A consequence of this symmetry is the Vlasov–Petrishchev–Talanov theorem (Vlasov et al. in Radiophys. Quantum Electron. 14:1062–1070, 1971) that relates the mean of the squared distribution and the Hamiltonian of the system. This theorem is valid for both focusing and defocusing media. In the quasiclassical limit, this makes it possible to construct anisotropic solutions which describe beam compression during self-focusing and quantum-gas expansion into vacuum within the so-called critical nonlinear Schrödinger equations, in particular, for the Gross–Pitaevskii equation with a chemical potential having a power-law dependence on density with the exponent ν = 2/d. For the Gross–Pitaevskii equation, the case d = 2 corresponds to a condensate of a weakly nonideal Bose gas, and the case d = 3 describe condensate of a Fermi gas in the unitary limit. For d = 3, the Gross–Pitaevskii equation in the quasiclassical limit transforms into equations of the gas dynamics with the adiabatic exponent γ = 5/3. The self-similar solutions in this approximation describe the angular deformations of a gas cloud against the background of an expanding gas. Angular deformations of such type are observed in both the expansion of quantum gases and the action of high-power laser radiation on matter. For three-dimensional supercritical focusing NLSE, the quasiclassical solutions of the collapsing type are presented, including the exact semiclassical solution described by the strong collapse regime. It is found that all such quasiclassical collapses are found to be unstable, except for the collapse that is simultaneously the weakest and the fastest collapse corresponding to the self-similar NLSE solution. The problem of post-collapse is also considered as the continuation of a weak collapse, which results in the formation of a quasistationary singularity in the form of a black hole into which energy is drawn from the surrounding collapsing region. For the NLSE with d ≥ 4, the formation of a black hole can be described in the quasiclassical approximation. It is shown that the anisotropy caused by the magnetic field significantly alters the structure of the Langmuir collapse, in particular, leads to the formation of strongly anisotropic black holes described quasiclassically.</p>","PeriodicalId":748,"journal":{"name":"Radiophysics and Quantum Electronics","volume":"66 5-6","pages":"305 - 320"},"PeriodicalIF":0.8,"publicationDate":"2024-03-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140314335","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}