Bulletin of the Lebedev Physics Institute最新文献

Effect of Dispersion of Gas-Filled Hollow-Core Optical Fiber on Nonlinear Spectral Broadening of Femtosecond Pulses and on the Quality of Their Compression by an External Compressor 充气空心芯光纤色散对飞秒脉冲非线性谱展宽及外部压缩质量的影响

IF 0.6 4区物理与天体物理

Bulletin of the Lebedev Physics Institute Pub Date : 2026-11-10 DOI: 10.3103/S1068335626601287

D. S. Dubrovskii, Yu. P. Yatsenko, A. A. Krylov, A. F. Kosolapov, A. V. Gladyshev

引用次数: 0

Study of the Fluorescence of a Ti3+:Al2O3 Crystal under Diode-Pump Excitation at 405, 454, and 507 nm Ti3+:Al2O3晶体在405,454和507 nm二极管泵浦激发下的荧光研究

IF 0.6 4区物理与天体物理

Bulletin of the Lebedev Physics Institute Pub Date : 2026-11-10 DOI: 10.3103/S1068335626601238

D. V. Yakovin, M. D. Yakovin, A. V. Gribanov, E. F. Zhilina, M. I. Mosin, G. N. Nikolaev

{"title":"Study of the Fluorescence of a Ti3+:Al2O3 Crystal under Diode-Pump Excitation at 405, 454, and 507 nm","authors":"D. V. Yakovin, M. D. Yakovin, A. V. Gribanov, E. F. Zhilina, M. I. Mosin, G. N. Nikolaev","doi":"10.3103/S1068335626601238","DOIUrl":"10.3103/S1068335626601238","url":null,"abstract":"We report an investigation of a Ti3+:Al2O3 crystal grown by the Czochralski method. The dependence of the crystal absorption on the excitation wavelength is measured in the range of 350–600 nm. The temperature dependences of the fluorescence of the titanium–sapphire crystal excited by radiation at 507, 454, and 405 nm are measured. The fluorescence quantum yield is determined. The fluorescence quantum yield of the crystal is found to exceed 100% in the cryogenic temperature range and is 113% at 77 K and 454 nm excitation. When the crystal is excited at 405 nm, the fluorescence quantum yield remains unchanged in the temperature range of 77–300 K and is approximately 23%. The temperature dependence of the fluorescence spectrum of the Ti3+:Al2O3 crystal is measured; as the crystal temperature decreases, the fluorescence spectrum narrows. The excitation spectrum of the crystal is measured in the range of 360–660 nm at room temperature and liquid nitrogen temperature.","PeriodicalId":503,"journal":{"name":"Bulletin of the Lebedev Physics Institute","volume":"53 4","pages":"S362 - S368"},"PeriodicalIF":0.6,"publicationDate":"2026-11-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149369265","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 Terahertz Radiation in a Semiconductor under Oblique Incidence of a Femtosecond Laser Pulse 飞秒激光斜入射下半导体中太赫兹辐射的产生

IF 0.6 4区物理与天体物理

Bulletin of the Lebedev Physics Institute Pub Date : 2026-11-10 DOI: 10.3103/S1068335626601561

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

引用次数: 0

Cumulative Thermal Effects in Nanoplasmonic Recording of Birefringent Microstructures by Femtosecond Laser Radiation in the Bulk of Fused Silica 飞秒激光在熔融二氧化硅体中记录双折射微结构的累积热效应

IF 0.6 4区物理与天体物理

Bulletin of the Lebedev Physics Institute Pub Date : 2026-11-10 DOI: 10.3103/S1068335626601597

A. E. Rupasov, G. K. Krasin, M. S. Kovalev, S. I. Kudryashov, A. S. Comshin

{"title":"Cumulative Thermal Effects in Nanoplasmonic Recording of Birefringent Microstructures by Femtosecond Laser Radiation in the Bulk of Fused Silica","authors":"A. E. Rupasov, G. K. Krasin, M. S. Kovalev, S. I. Kudryashov, A. S. Comshin","doi":"10.3103/S1068335626601597","DOIUrl":"10.3103/S1068335626601597","url":null,"abstract":"For the first time, we investigate the thermal effect on the structure of nanogratings, formed in fused silica via the well-known plasmonic mechanism and exhibiting form birefringence, as a function of increasing exposure N (4 × 102 to 3 × 104 pulses per spot). This exposure accumulates in scanning mode due to the repetition rate f (25 kHz to 2 MHz) of tightly focused (numerical aperture NA = 0.25) ultrashort (0.3 ps) near-IR (1030 nm) laser pulses with fixed energy. When N increases up to 7.5 × 103, a slight decline in the photoluminescence intensity of non-bridging oxygen hole centers anti-correlates with an increase in the phase shift and transmittance of nanogratings. Above this N threshold, there is a sharp suppression of luminescence, a drop in optical transmittance, and a collapse of the induced birefringence caused by thermal destruction of the material (local temperature T ≈ 2 × 103°C). It is shown that cumulative heating with increasing exposure to ultrashort laser pulses causes annealing of Frenkel oxygen defects, thereby improving the quality of nanogratings up to the thermal degradation threshold of the material.","PeriodicalId":503,"journal":{"name":"Bulletin of the Lebedev Physics Institute","volume":"53 4","pages":"S295 - S302"},"PeriodicalIF":0.6,"publicationDate":"2026-11-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149369264","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

Luminescence of the D′ Ion-Pair State of Halogen Molecules in Perfluorooctane 全氟辛烷中卤素分子D '离子对态的发光

IF 0.6 4区物理与天体物理

Bulletin of the Lebedev Physics Institute Pub Date : 2026-11-10 DOI: 10.3103/S1068335626601536

V. A. Alekseev, S. B. Mamaev, P. Yu. Serdobintsev, A. P. Shirokikh

{"title":"Luminescence of the D′ Ion-Pair State of Halogen Molecules in Perfluorooctane","authors":"V. A. Alekseev, S. B. Mamaev, P. Yu. Serdobintsev, A. P. Shirokikh","doi":"10.3103/S1068335626601536","DOIUrl":"10.3103/S1068335626601536","url":null,"abstract":"Laser-induced luminescence spectra corresponding to the D′ → A′ transition of I2, Br2, and IBr molecule solutions in perfluorooctane (PFO) are investigated at solution temperatures ranging from 20 to 75°C. It is shown that the D′ → A′ transition band shifts toward shorter wavelengths as the temperature increases. In the case of IBr, the shift is not accompanied by a change in the spectral shape, whereas for I2 and Br2, the band is markedly narrowed due to a reduction in the intensity on the long-wavelength wing—at a distance from the band maximum corresponding to the energy of an infrared-active vibrational mode of the C8F18 molecule (νC–F ≈ 1270 cm–1). This band-narrowing effect is attributed to a decrease in the probability of a process in which photon emission by an X2 (D′) molecule (X = I, Br) is accompanied by the excitation of a νC–F vibration in one of the C8F18 molecules within the X2(D′) solvation shell. The feasibility of achieving lasing on the D′ → A′ transition via optical pumping of a halogen solution in PFO is discussed. An iodine solution appears to be the most promising, as the I2 (D′ → A′) luminescence excitation band lies entirely within the transparency range of PFO and quartz. It is shown that, due to the solvation effect, the long-wavelength threshold of the I2 (D′ → A′) luminescence excitation spectrum, observed in the gas phase at λ ≈ 210 nm, shifts to λ ≈ 220 nm in PFO, a factor that further favors optical pumping.","PeriodicalId":503,"journal":{"name":"Bulletin of the Lebedev Physics Institute","volume":"53 4","pages":"S320 - S330"},"PeriodicalIF":0.6,"publicationDate":"2026-11-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149369260","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

Sign Inversion of the Phase Shift of Laser-Induced Structures in the Bulk of Fused Silica 熔融二氧化硅体中激光诱导结构相移的符号反转

IF 0.6 4区物理与天体物理

Bulletin of the Lebedev Physics Institute Pub Date : 2026-11-10 DOI: 10.3103/S1068335626601615

A. E. Rupasov, A.V. Gorevoy, M. S. Kovalev, S. I. Kudryashov

引用次数: 0

Control of Transport and Localization States in a Dendritic-Type Photonic Lattice 树突型光子晶格中输运和局域态的控制

IF 0.6 4区物理与天体物理

Bulletin of the Lebedev Physics Institute Pub Date : 2026-11-10 DOI: 10.3103/S1068335626601585

O. V. Korovai

引用次数: 0

Role of Shell Resonances in the Formation of Plasmon–Exciton Coupling in Metal/J-Aggregate Nanoparticles 壳共振在金属/ j聚集体纳米粒子中等离子体-激子耦合形成中的作用

IF 0.6 4区物理与天体物理

Bulletin of the Lebedev Physics Institute Pub Date : 2026-11-10 DOI: 10.3103/S1068335626601299

S. S. Moritaka, V. S. Lebedev

{"title":"Role of Shell Resonances in the Formation of Plasmon–Exciton Coupling in Metal/J-Aggregate Nanoparticles","authors":"S. S. Moritaka, V. S. Lebedev","doi":"10.3103/S1068335626601299","DOIUrl":"10.3103/S1068335626601299","url":null,"abstract":"We report the results of an investigation of the optical properties of two-layer hybrid nanoparticles consisting of a silver or gold core coated with an outer layer of molecular J-aggregates of an organic dye. The main emphasis is placed on studying the effect of splitting of the dye J-band into two excitonic resonances of the outer shell and its influence on the behavior of the light absorption spectra of such metal–organic nanoparticles. For the dyes under study, the splitting energies of such resonances reach approximately 100–150 meV, which significantly exceeds their width. Splitting the dye J-band into two spectral peaks is a natural consequence of the presence of internal and external boundaries of the organic shell of the metal/J-aggregate particle. The analysis shows that the most correct and justified approach for determining the coupling strength of plasmon–exciton interaction in such systems is the use of two coupling constants g+ and g–. An analytical approach for calculating these constants is developed, and it is shown that it has significant advantages over the conventional simplified method for characterizing plexcitonic coupling using a single constant g that is determined using the model of two coupled oscillators. The plasmon–exciton interaction mechanism under study broadens existing understanding of the nature of near-field electromagnetic coupling in hybrid nanosystems. Clarifying such mechanisms is necessary for the fabrication of new materials that may be used as the building blocks of nanophotonic devices operating based on plasmon–exciton interactions.","PeriodicalId":503,"journal":{"name":"Bulletin of the Lebedev Physics Institute","volume":"53 4","pages":"S369 - S395"},"PeriodicalIF":0.6,"publicationDate":"2026-11-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149369263","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

Numerical Simulation of Waves in a Magnetic Slab with Competing Thermal Instabilities 具有竞争热不稳定性的磁板状波的数值模拟

IF 0.6 4区物理与天体物理

Bulletin of the Lebedev Physics Institute Pub Date : 2026-11-09 DOI: 10.3103/S1068335626600750

D. V. Agapova, D. I. Zavershinskii, E. A. Yarunova

引用次数: 0

Paraxial Approach to Lenseless Coherent Imaging 无透镜相干成像的近轴方法

IF 0.6 4区物理与天体物理

Bulletin of the Lebedev Physics Institute Pub Date : 2026-11-09 DOI: 10.3103/S1068335626601147

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

{"title":"Paraxial Approach to Lenseless Coherent Imaging","authors":"I. A. Artyukov, A. V. Vinogradov, N. L. Popov","doi":"10.3103/S1068335626601147","DOIUrl":"10.3103/S1068335626601147","url":null,"abstract":"As is known, coherent imaging (CI), which emerged in the second half of the last century, offers an alternative to traditional optical imaging systems. The essence of the method is the mathematical processing of diffraction patterns produced by an object placed in a coherent beam. In this case, focusing optical elements and systems are not used. The set of necessary components can be reduced to a source of coherent radiation, a matrix receiver, and a computer that performs numerical calculations. This eliminates the need for expensive optical instruments. Moreover, CI characterizes the object not only by the modulus of the field of the transmitted wave, but also by its phase. These obvious advantages stimulate research and engineering efforts aimed at improving the method and facilitating its practical application. It is shown that the paraxial approach allows the CI method to be applied not only to plane waves incident on a sample, but also to coherent probing beams of arbitrary transverse structure. This simplifies the requirements for radiation sources and expands the possibilities for practical implementation. The conditions for the applicability of this approach are formulated.","PeriodicalId":503,"journal":{"name":"Bulletin of the Lebedev Physics Institute","volume":"53 10","pages":"407 - 413"},"PeriodicalIF":0.6,"publicationDate":"2026-11-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149369253","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