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Modification of the Split-Step Method for Modeling Multicore Fiber with Saturated Gain
IF 0.6 4区 物理与天体物理
Bulletin of the Lebedev Physics Institute Pub Date : 2025-02-15 DOI: 10.3103/S1068335624602504
G. A. Patrin, I. S. Chekhovskoy, O. V. Shtyrina, M. P. Fedoruk
{"title":"Modification of the Split-Step Method for Modeling Multicore Fiber with Saturated Gain","authors":"G. A. Patrin,&nbsp;I. S. Chekhovskoy,&nbsp;O. V. Shtyrina,&nbsp;M. P. Fedoruk","doi":"10.3103/S1068335624602504","DOIUrl":"10.3103/S1068335624602504","url":null,"abstract":"<p>We report an efficient noniterative numerical algorithm for solving a system of linearly coupled nonlinear Schrödinger equations (NLSE) describing the propagation of light pulses in multicore optical fibers, with optical losses and saturated gain taken into account. The method can also be used in the case of a single scalar NLSE. The proposed algorithm is based on the split-step Fourier method and has the second order of accuracy in the evolutionary variable and the exponential order of accuracy in time. To solve the system of coupled NLSEs, we propose to approximate the matrix exponential using the Pade approximation.</p>","PeriodicalId":503,"journal":{"name":"Bulletin of the Lebedev Physics Institute","volume":"51 10 supplement","pages":"S816 - S825"},"PeriodicalIF":0.6,"publicationDate":"2025-02-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143423249","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Transport Frequencies of Collisions of Cs Atoms in the Ground and Excited States with Inert Gas Atoms
IF 0.6 4区 物理与天体物理
Bulletin of the Lebedev Physics Institute Pub Date : 2025-02-04 DOI: 10.3103/S1068335624602395
A. I. Parkhomenko, A. M. Shalagin
{"title":"Transport Frequencies of Collisions of Cs Atoms in the Ground and Excited States with Inert Gas Atoms","authors":"A. I. Parkhomenko,&nbsp;A. M. Shalagin","doi":"10.3103/S1068335624602395","DOIUrl":"10.3103/S1068335624602395","url":null,"abstract":"<p>Using the literature data on the calculated ab initio interatomic interaction potentials, we determine transport frequencies of collisions of Cs atoms in the ground and excited states with atoms of inert gases He, Ne, Ar, Kr, and Xe (a temperature range from 100 to 2000 K). We report the calculated data for the relative difference in the transport frequencies of collisions, which are necessary for a quantitative description of the effect of the light-induced drift of Cs atoms in a buffer medium of inert gases. Analysis of the experimental data on the light-induced drift of Cs using the obtained results will make it possible to confidently select the most correct models of interaction potentials.</p>","PeriodicalId":503,"journal":{"name":"Bulletin of the Lebedev Physics Institute","volume":"51 9 supplement","pages":"S697 - S702"},"PeriodicalIF":0.6,"publicationDate":"2025-02-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143108335","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Comparative Analysis of the Efficiency of Different Photoabsorption Channels of NeAr+ Molecular Ions Associated with Transitions to the ArNe+ State
IF 0.6 4区 物理与天体物理
Bulletin of the Lebedev Physics Institute Pub Date : 2025-02-04 DOI: 10.3103/S1068335624602425
V. S. Lebedev, A. A. Narits, K. S. Kislov
{"title":"Comparative Analysis of the Efficiency of Different Photoabsorption Channels of NeAr+ Molecular Ions Associated with Transitions to the ArNe+ State","authors":"V. S. Lebedev,&nbsp;A. A. Narits,&nbsp;K. S. Kislov","doi":"10.3103/S1068335624602425","DOIUrl":"10.3103/S1068335624602425","url":null,"abstract":"<p>The processes of continuous photoabsorption by weakly bound NeAr<sup>+</sup> molecular ions at room and elevated temperatures have been theoretically investigated. A comparative analysis of the relative contributions of four types of phototransitions (photodissociation, bound-bound transitions, free-free transitions and photoassociation) with different initial and final states of internuclear motion to the total absorption coefficient at room and elevated temperatures was made. It is shown that it is possible to describe under certain assumptions the above contributions under quasi-equilibrium conditions without resorting to direct calculation of photoabsorption coefficients for each of the channels. It is demonstrated that the relative efficiencies of different types of phototransitions in the NeAr<sup>+</sup> ion radically differ from previous results for homonuclear noble gas ions and for ArXe<sup>+</sup> and KrXe<sup>+</sup> ions. The dependences of these contributions on the wavelength of the incident radiation and on the gas temperature of the plasma were investigated. It was found that there are well-defined regions corresponding to the predominance of a particular channel of phototransitions within the wavelength range where efficient absorption occurs. The presented results are of interest for the construction of kinetic models of pumping and excitation relaxation in gas lasers based on active media containing Ne/Ar mixtures.</p>","PeriodicalId":503,"journal":{"name":"Bulletin of the Lebedev Physics Institute","volume":"51 9 supplement","pages":"S762 - S774"},"PeriodicalIF":0.6,"publicationDate":"2025-02-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143108099","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Analysis of Extinction Spectra and Near-Field Electromagnetic Coupling Regimes for Plexcitonic Nanoparticles in the Coupled Oscillator Model
IF 0.6 4区 物理与天体物理
Bulletin of the Lebedev Physics Institute Pub Date : 2025-02-04 DOI: 10.3103/S1068335624602279
S. S. Moritaka, V. S. Lebedev
{"title":"Analysis of Extinction Spectra and Near-Field Electromagnetic Coupling Regimes for Plexcitonic Nanoparticles in the Coupled Oscillator Model","authors":"S. S. Moritaka,&nbsp;V. S. Lebedev","doi":"10.3103/S1068335624602279","DOIUrl":"10.3103/S1068335624602279","url":null,"abstract":"<p>We have performed a theoretical analysis of the extinction spectra of light in hybrid plasmon–exciton nanosystems. Within the framework of the quasistatic approximation, an analytical formula is derived that explicitly defines the dependence of the effective cross section of light extinction by a system of coupled oscillators on their eigenfrequencies and damping constants as well as on the coupling constant and the frequency of the incident light. The theory has been applied to the analysis of light absorption by specific plasmon–exciton nanosystems. These systems consist of a spherical and rod-shaped metal core coated with an outer layer of an isotropic molecular aggregate of a dye. We have shown that the results of the work can be used for quantitative interpretation of the available experimental data on the light extinction spectra in the regimes of weak and strong plasmon–exciton coupling. Studying the effects of plasmon–exciton coupling is of particular interest for the development of hybrid nanowaveguides, highly sensitive photodetectors, and optical sensors.</p>","PeriodicalId":503,"journal":{"name":"Bulletin of the Lebedev Physics Institute","volume":"51 9 supplement","pages":"S750 - S761"},"PeriodicalIF":0.6,"publicationDate":"2025-02-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143108100","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Optothermal Traps Based on Mosaic Phase Masks
IF 0.6 4区 物理与天体物理
Bulletin of the Lebedev Physics Institute Pub Date : 2025-02-04 DOI: 10.3103/S1068335624602413
S. P. Kotova, N. N. Losevsky, A. M. Mayorova, S. A. Samagin
{"title":"Optothermal Traps Based on Mosaic Phase Masks","authors":"S. P. Kotova,&nbsp;N. N. Losevsky,&nbsp;A. M. Mayorova,&nbsp;S. A. Samagin","doi":"10.3103/S1068335624602413","DOIUrl":"10.3103/S1068335624602413","url":null,"abstract":"<p>The expansion of the functionality of optothermal traps through the use of mosaic diffraction elements has been experimentally demonstrated. The phase functions of simple optical elements are used to form mosaic (sector, ring, and their combinations) phase masks. For the first time, a controlled rotation of ensembles of microparticles in optothermal traps of various shapes has been implemented. It is shown that during rotations with velocities of 2.7–6.5 deg/s, latex microparticles with dimensions of 3–4 μm are held in optothermal traps.</p>","PeriodicalId":503,"journal":{"name":"Bulletin of the Lebedev Physics Institute","volume":"51 9 supplement","pages":"S741 - S749"},"PeriodicalIF":0.6,"publicationDate":"2025-02-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143108063","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Light Pressure on a Spherical Particle in the Interference Field of Two Monochromatic Bessel Beams
IF 0.6 4区 物理与天体物理
Bulletin of the Lebedev Physics Institute Pub Date : 2025-02-04 DOI: 10.3103/S1068335624602437
D. V. Guzatov
{"title":"Light Pressure on a Spherical Particle in the Interference Field of Two Monochromatic Bessel Beams","authors":"D. V. Guzatov","doi":"10.3103/S1068335624602437","DOIUrl":"10.3103/S1068335624602437","url":null,"abstract":"<p>General analytical expressions are derived for the light pressure force that acts on a spherical particle of arbitrary size and material composition (dielectric, metal) located in the interference field of two arbitrary monochromatic vector Bessel beams. For identical beams on orders of <i>m</i> = 0 and 1, the light pressure force is examined for the case of two parallel and copropagating beams and the case of intersection of the beam axes near a dielectric particle. It is shown that the presence of interference leads to a complex motion of a particle located in a plane perpendicular to the parallel beams. It is also demonstrated that with a change in the angle formed by the intersection of the axes of Bessel beams in the center of the particle, the light pressure force changes nonmonotonically, passing through maxima and minima, the number of which increases with increasing particle size. When the particle is displaced from the intersection point of the axes along a straight line located symmetrically between the beams, the light pressure force oscillates with a change in sign and with a gradually decreasing amplitude.</p>","PeriodicalId":503,"journal":{"name":"Bulletin of the Lebedev Physics Institute","volume":"51 9 supplement","pages":"S775 - S788"},"PeriodicalIF":0.6,"publicationDate":"2025-02-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143108098","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Efficient Laser Acceleration of Electrons and Ions from Targets with Controlled Preplasma
IF 0.6 4区 物理与天体物理
Bulletin of the Lebedev Physics Institute Pub Date : 2025-02-04 DOI: 10.3103/S1068335624602127
A. V. Brantov, M. A. Rakitina, S. I. Glazyrin
{"title":"Efficient Laser Acceleration of Electrons and Ions from Targets with Controlled Preplasma","authors":"A. V. Brantov,&nbsp;M. A. Rakitina,&nbsp;S. I. Glazyrin","doi":"10.3103/S1068335624602127","DOIUrl":"10.3103/S1068335624602127","url":null,"abstract":"<p>Compact sources of high-energy particles and secondary radiation based on the interaction of high-power laser pulses with plasma targets are of interest due to a possibility of their application in a wide range of practical problems. One of the ways to optimize such sources is related to the possibility of controlling the preplasma of a solid target by changing the density gradient of the expanding plasma plume on the irradiated side. The problem of accelerating charged particles by a short laser pulse from targets with a preplasma generated by a nanosecond prepulse (additional pulse) of different intensity and duration is considered. Using self-consistent hydrodynamic/kinetic simulation, the efficiency of electron acceleration is shown to depend not only on the gradient of the preplasma density profile, but also on the focusing point of the laser pulse on this profile.</p>","PeriodicalId":503,"journal":{"name":"Bulletin of the Lebedev Physics Institute","volume":"51 9 supplement","pages":"S712 - S719"},"PeriodicalIF":0.6,"publicationDate":"2025-02-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143108228","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Measurements of the Spectral Characteristics of the Laser-Plasma Sources Using Thermoluminescent Detectors
IF 0.6 4区 物理与天体物理
Bulletin of the Lebedev Physics Institute Pub Date : 2025-02-04 DOI: 10.3103/S1068335624602310
K. A. Ivanov, G. Kh. Salakhutdinov, A. I. Sivko, I. N. Tsymbalov, I. G. Grigor’eva, I. A. Busygina, A. A. Rupasov, P. V. Moskvich, R. V. Volkov, A. B. Savel’ev
{"title":"Measurements of the Spectral Characteristics of the Laser-Plasma Sources Using Thermoluminescent Detectors","authors":"K. A. Ivanov,&nbsp;G. Kh. Salakhutdinov,&nbsp;A. I. Sivko,&nbsp;I. N. Tsymbalov,&nbsp;I. G. Grigor’eva,&nbsp;I. A. Busygina,&nbsp;A. A. Rupasov,&nbsp;P. V. Moskvich,&nbsp;R. V. Volkov,&nbsp;A. B. Savel’ev","doi":"10.3103/S1068335624602310","DOIUrl":"10.3103/S1068335624602310","url":null,"abstract":"<p>A method of wide-range X-ray and electron spectrometry of plasma formed by a femtosecond laser pulse with a peak intensity of over 10<sup>18</sup> W/cm<sup>2</sup> on the surface of a solid-state target is experimentally considered. Measurements of a flow of charged particles and quanta were carried out using thermoluminescent detectors based on LiF(Mg, Ti) that accumulate a dose, in front of which magnets were additionally installed to isolate the X-ray component. The spectra were obtained on the basis of the method for determining the accumulated dose of a detector depending on the thickness of the filter installed in front of it. The data have been restored in the range from 10 keV to several megaelectronvolts. The “temperatures” of the hot electron components of laser plasma have been determined, which are 160 and 1500 keV and may be related to the effects of particle acceleration in the dense-plasma region, as well as the temperatures during propagation of radiation in a cloud of subcritical density.</p>","PeriodicalId":503,"journal":{"name":"Bulletin of the Lebedev Physics Institute","volume":"51 9 supplement","pages":"S720 - S727"},"PeriodicalIF":0.6,"publicationDate":"2025-02-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143108229","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Spaser with a Three-Level Active Medium Based on a Layered Cylinder
IF 0.6 4区 物理与天体物理
Bulletin of the Lebedev Physics Institute Pub Date : 2025-02-04 DOI: 10.3103/S1068335624602401
T. M. Chmereva, M. G. Kucherenko, F. Yu. Mushin
{"title":"Spaser with a Three-Level Active Medium Based on a Layered Cylinder","authors":"T. M. Chmereva,&nbsp;M. G. Kucherenko,&nbsp;F. Yu. Mushin","doi":"10.3103/S1068335624602401","DOIUrl":"10.3103/S1068335624602401","url":null,"abstract":"<p>We report a theoretical study of a spaser with an active medium containing three-level molecules or quantum dots, generating one-dimensional axisymmetric plasmon polaritons in a circular cross-section nanowire with a dielectric core and a silver shell. Within the quantum approach to the description of a three-level system and a plasmon polariton, equations of the spaser dynamics are derived and some of their parameters are calculated. The ranges of relaxation rates between excited states of a three-level system are found, at which plasmons of a higher or lower frequency, as well as of both frequencies simultaneously, are generated. It is shown that the stationary number of plasmons of a higher frequency increases linearly with increasing pump rate, and the number of plasmons of a lower frequency either increases nonlinearly or remains constant. Different dependences of the number of plasmons with a higher and lower frequency on the inner radius of the nanowire shell are obtained.</p>","PeriodicalId":503,"journal":{"name":"Bulletin of the Lebedev Physics Institute","volume":"51 9 supplement","pages":"S728 - S740"},"PeriodicalIF":0.6,"publicationDate":"2025-02-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143108101","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Investigation of the Effect of Background Plasma Parameters on Efficient Generation of Alfvén Waves Produced by Laser Plasma Bunches at Mach Numbers MA = 0.2
IF 0.6 4区 物理与天体物理
Bulletin of the Lebedev Physics Institute Pub Date : 2025-02-04 DOI: 10.3103/S1068335624602176
A. G. Berezutsky, V. N. Tishchenko, I. B. Miroshnichenko, S. S. Sharipov, A. A. Chibranov, Yu. P. Zakharov, I. F. Shaikhislamov
{"title":"Investigation of the Effect of Background Plasma Parameters on Efficient Generation of Alfvén Waves Produced by Laser Plasma Bunches at Mach Numbers MA = 0.2","authors":"A. G. Berezutsky,&nbsp;V. N. Tishchenko,&nbsp;I. B. Miroshnichenko,&nbsp;S. S. Sharipov,&nbsp;A. A. Chibranov,&nbsp;Yu. P. Zakharov,&nbsp;I. F. Shaikhislamov","doi":"10.3103/S1068335624602176","DOIUrl":"10.3103/S1068335624602176","url":null,"abstract":"<p>We report the results of numerical simulation of the generation of intense low-frequency Alfvén waves produced by periodic laser plasma bunches under conditions of substantially pre-Alfvén expansion at Mach numbers <i>M</i><sub>A</sub> ≤ 0.2. The effect of the parameters of background plasma and the mass of ions on the effective generation of waves, as well as their structure and intensity is considered.</p>","PeriodicalId":503,"journal":{"name":"Bulletin of the Lebedev Physics Institute","volume":"51 9 supplement","pages":"S703 - S711"},"PeriodicalIF":0.6,"publicationDate":"2025-02-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143108227","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
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