Bulletin of the Lebedev Physics Institute最新文献_第2页

Controlling the Positions of Energy Subbands in GaAs/AlGaAs Heterostructures over a Wide Range up to the Continuum 控制GaAs/AlGaAs异质结构中能量子带的位置直至连续统

IF 0.6 4区物理与天体物理

Bulletin of the Lebedev Physics Institute Pub Date : 2026-10-05 DOI: 10.3103/S106833562660097X

S. A. Savinov, Yu. A. Mityagin, M. P. Telenkov, P. S. Klemmer, V. V. Voronova, D. A. Pashkeev, V. P. Martovitsky, P. F. Kartsev, A. L. Vasiliev

引用次数: 0

Effect of the Number of Cylindrical Azimuthal Modes on Electron Energy and Angular Spectra in Simulations of Laser-Plasma Acceleration in Subcritical Plasma 亚临界等离子体激光加速模拟中圆柱方位角模数对电子能量和角谱的影响

IF 0.6 4区物理与天体物理

Bulletin of the Lebedev Physics Institute Pub Date : 2026-10-05 DOI: 10.3103/S1068335626600968

N. N. Nikiforov, E. M. Starodubtseva, I. N. Tsymbalov, A. B. Savel’ev

{"title":"Effect of the Number of Cylindrical Azimuthal Modes on Electron Energy and Angular Spectra in Simulations of Laser-Plasma Acceleration in Subcritical Plasma","authors":"N. N. Nikiforov, E. M. Starodubtseva, I. N. Tsymbalov, A. B. Savel’ev","doi":"10.3103/S1068335626600968","DOIUrl":"10.3103/S1068335626600968","url":null,"abstract":"Particle-in-cell (PIC) simulations of laser-plasma interaction using cylindrical geometry with azimuthal mode decomposition (AMD) significantly reduce computational costs compared with 3D simulations; however, for regimes in which axial symmetry is broken, the simulation accuracy depends on the number of modes (m) taken into account. This paper presents a systematic analysis of the AMD approach for two laser-plasma acceleration regimes: conventional laser wakefield acceleration (LWFA) in underdense plasma (ne = 0.005ncr) and self-modulated laser wakefield acceleration (SM-LWFA) in higher-density plasma (ne = 0.03ncr). It is shown that for axially symmetric LWFA, two modes (m = 2) are sufficient. For SM-LWFA, which is characterized by the development of symmetry-breaking instabilities, the requirements for the number of modes are more stringent: accurately reproducing the energy spectrum of accelerated electrons requires four modes (m = 4), while reproducing the angular spectrum requires twelve modes (m = 12). Even with twelve modes retained, the computational cost of the AMD simulation is approximately eight times lower than that of a full 3D simulation. These results are of particular importance for high-repetition-rate terawatt laser systems, in which SM-LWFA is the dominant acceleration mechanism, enabling higher acceleration gradients and larger beam charge.","PeriodicalId":503,"journal":{"name":"Bulletin of the Lebedev Physics Institute","volume":"53 3","pages":"S226 - S234"},"PeriodicalIF":0.6,"publicationDate":"2026-10-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149098635","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

Generation of Optical Radiation with a Rotating Polarization Vector and a Controlled Phase Shift 具有旋转偏振矢量和控制相移的光辐射的产生

IF 0.6 4区物理与天体物理

Bulletin of the Lebedev Physics Institute Pub Date : 2026-10-05 DOI: 10.3103/S1068335626600907

V. M. Kotov

引用次数: 0

Strategies for High-Performance Laser Synthesis of Boron Nanoparticles in Liquids for Neutron Capture Therapy 用于中子俘获治疗的液体中高性能激光合成硼纳米颗粒的策略

IF 0.6 4区物理与天体物理

Bulletin of the Lebedev Physics Institute Pub Date : 2026-10-05 DOI: 10.3103/S1068335625604339

A. A. Laktionov, D. I. Tselikov, S. M. Klimentov, M. V. Klimkina, A. S. Lysenkov, D. N. Mamonov, A. A. Popov, K. A. Shcherbakov, A. N. Kozlov, M. S. Grigoryeva, N. V. Karpov, E. V. Barmina, A. V. Kabashin, I. N. Zavestovskaya

引用次数: 0

Towards the Theory of Coherent Imaging for Determining the Complex Refractive Index of Film Structures 确定薄膜结构复折射率的相干成像理论探讨

IF 0.6 4区物理与天体物理

Bulletin of the Lebedev Physics Institute Pub Date : 2026-10-05 DOI: 10.3103/S1068335626601160

I. A. Artyukov, A. V. Vinogradov, N. L. Popov

引用次数: 0

Multiwavelength SRS Conversion in a BaWO4 Crystal Pumped by 1030 nm High-Power Chirped Subpicosecond Laser Pulses 1030nm高功率啁啾亚皮秒激光脉冲泵浦的BaWO4晶体多波长SRS转换

IF 0.6 4区物理与天体物理

Bulletin of the Lebedev Physics Institute Pub Date : 2026-10-05 DOI: 10.3103/S1068335626601032

D. P. Tereshchenko, E. A. Peganov, K. A. Gubina, Yu. A. Kochukov, A. G. Papashvili, V. E. Shukshin, I. S. Voronina, L. I. Ivleva, A. A. Ushakov, V. V. Bulgakova, P. A. Chizhov, S. N. Smetanin

{"title":"Multiwavelength SRS Conversion in a BaWO4 Crystal Pumped by 1030 nm High-Power Chirped Subpicosecond Laser Pulses","authors":"D. P. Tereshchenko, E. A. Peganov, K. A. Gubina, Yu. A. Kochukov, A. G. Papashvili, V. E. Shukshin, I. S. Voronina, L. I. Ivleva, A. A. Ushakov, V. V. Bulgakova, P. A. Chizhov, S. N. Smetanin","doi":"10.3103/S1068335626601032","DOIUrl":"10.3103/S1068335626601032","url":null,"abstract":"We report an experimental study of highly transient stimulated Raman scattering (SRS) in a BaWO4 crystal pumped by a subpicosecond ytterbium fiber laser at a wavelength of 1030 nm, with adjustable pump-pulse chirp and pulse durations ranging from 0.25 to 6 ps (positive and negative external chirp). It is shown that, in agreement with theoretical predictions, SRS is observed when the chirped pump pulse duration exceeds 0.73 ps—allowing the system to overcome the suppressive effect of Kerr nonlinearities; otherwise, up to 62% of the pump energy is converted into supercontinuum. The optimal pulse-duration ranges for chirped pump pulses are found to be 2–5 ps and 1–4 ps for positive and negative external chirp, respectively. In these ranges, efficient multiwavelength SRS generation occurs, involving both a high-frequency shift associated with the strong totally symmetric vibrational mode (925 cm–1) and a low-frequency shift associated with the weak bending vibrational mode (332 cm–1), with a total SRS conversion efficiency of 31.5% for the first Stokes components (wavelengths of approximately 1138 and 1066 nm). The shift of this optimal range toward lower pulse durations with negative external pump-pulse chirp is attributed to a reduction in the resulting chirp caused by the presence of positive internal chirp induced by nonlinear self- and cross-phase modulation effects. Adjustable pump-pulse chirp also enables the controlled tuning of the wavelength of the first Stokes component of high-frequency-shifted SRS radiation within the 1136–1141 nm range.","PeriodicalId":503,"journal":{"name":"Bulletin of the Lebedev Physics Institute","volume":"53 3","pages":"S205 - S212"},"PeriodicalIF":0.6,"publicationDate":"2026-10-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149098500","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

Enhancing the Ultimate Sensitivity of Optical Sensors Based on Passive Ring Resonators Using a PT-Symmetric System of Optically Coupled Active and Closed-Loop Passive Waveguides 利用光耦合有源和闭环无源波导的pt对称系统提高无源环形谐振器光传感器的极限灵敏度

IF 0.6 4区物理与天体物理

Bulletin of the Lebedev Physics Institute Pub Date : 2026-10-05 DOI: 10.3103/S1068335626600701

E. V. Shalymov

{"title":"Enhancing the Ultimate Sensitivity of Optical Sensors Based on Passive Ring Resonators Using a PT-Symmetric System of Optically Coupled Active and Closed-Loop Passive Waveguides","authors":"E. V. Shalymov","doi":"10.3103/S1068335626600701","DOIUrl":"10.3103/S1068335626600701","url":null,"abstract":"This study investigates methods for enhancing the ultimate sensitivity of sensors based on passive ring resonators by utilizing the properties of PT-symmetry. A simple PT-symmetric system is considered, consisting of two parallel waveguides—one providing optical gain and the other introducing optical loss—where the passive waveguide forms part of a ring resonator coupled to the system. This configuration enables an increase in the ultimate sensitivity of sensors based on passive ring resonators. The system can operate in several regimes. The first regime is realized when the gain of the active waveguide does not exceed the coupling coefficient between the parallel waveguides. This regime makes it possible to increase the ultimate sensitivity by more than an order of magnitude—specifically, by a factor of 12 in the example analyzed. The second regime is obtained at an optimal ratio of system parameters. Theoretically, this regime enables an almost unlimited increase in the slope of the transmission coefficient of the system near frequencies lying between the resonator eigenfrequencies, thereby increasing the ultimate sensitivity. However, the amplification of the light passing through the system also increases almost without limit, which may hinder the practical implementation of this regime. Nevertheless, in practice, the use of the second regime can be appropriate when operating the sensor near the resonator eigenfrequencies, where the system does not amplify the transmitted light. In the example in question, this enabled a 76-fold increase in the ultimate sensitivity. The influence of the system parameters on the adjustment of these regimes is also analyzed.","PeriodicalId":503,"journal":{"name":"Bulletin of the Lebedev Physics Institute","volume":"53 3","pages":"S241 - S251"},"PeriodicalIF":0.6,"publicationDate":"2026-10-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149098058","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

Propagation Characteristics of an Ultrashort Laser Pulse with a Carrier Frequency Close to the GaAs Bandgap 载流子频率接近砷化镓带隙的超短激光脉冲的传输特性

IF 0.6 4区物理与天体物理

Bulletin of the Lebedev Physics Institute Pub Date : 2026-10-05 DOI: 10.3103/S1068335626600464

V. E. Grishkov, A. G. Maximov, S. A. Uryupin

{"title":"Propagation Characteristics of an Ultrashort Laser Pulse with a Carrier Frequency Close to the GaAs Bandgap","authors":"V. E. Grishkov, A. G. Maximov, S. A. Uryupin","doi":"10.3103/S1068335626600464","DOIUrl":"10.3103/S1068335626600464","url":null,"abstract":"The penetration into GaAs of an ultrashort laser pulse with a carrier frequency close to the absorption edge has been studied. It is shown that the frequency dispersion of the dielectric permittivity must be taken into account when describing penetration of such a pulse. It has been established that due to a sharp increase in the absorption coefficient with frequency increasing, as the ultrashort laser pulse penetrates into GaAs the maximum of the spectral energy density of the pulse shifts to the low-frequency region. Consequently, the shorter the pulse, the deeper it penetrates into GaAs, since a significant portion of the short pulse energy is concentrated at low frequencies. As the pulse penetrates deeper into the semiconductor, its shape is primarily determined by harmonics with frequencies lower than the frequency corresponding to the bandgap. In the considered frequency range, the group velocity in GaAs at high frequencies is lower than at low frequencies. Because of this, a small peak in the tail of the ultrashort laser pulse is formed, the main contribution to which comes from high-frequency harmonics that have a lower group velocity. The change in both the spectral composition and the shape of the reflected pulse is minor.","PeriodicalId":503,"journal":{"name":"Bulletin of the Lebedev Physics Institute","volume":"53 3","pages":"S218 - S225"},"PeriodicalIF":0.6,"publicationDate":"2026-10-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149098633","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

Unusual Influence of Relaxation Oscillations on the Optical Spectrum of 890-nm Vertical-Cavity Surface-Emitting Lasers 弛豫振荡对890 nm垂直腔面发射激光器光谱的异常影响

IF 0.6 4区物理与天体物理

Bulletin of the Lebedev Physics Institute Pub Date : 2026-10-05 DOI: 10.3103/S1068335626601172

E. D. Chivilis, A. P. Bogatov, A. A. Blokhin, S. A. Blokhin, M. A. Bobrov, V. V. Vassiliev, A. P. Vasiliev, M. I. Vaskovskaya, V. L. Velichanskii, S. A. Zibrov, N. A. Maleev, E. A. Tsygankov, D. S. Chuchelov

引用次数: 0

Modeling, Modernization, and Performance Analysis of a Rotary Valve in a Single-Stage Pulse Tube Cryocooler 单级脉冲管制冷机旋转阀的建模、现代化和性能分析

IF 0.6 4区物理与天体物理

Bulletin of the Lebedev Physics Institute Pub Date : 2026-09-23 DOI: 10.3103/S106833562660066X

R. G. Batulin, N. A. Maksimov, A. V. Kutergin, D. S. Uvin, A. A. Dobretzov

引用次数: 0