Bulletin of the Lebedev Physics Institute最新文献_第9页

Combined Levitating Sabot for Noncontact Acceleration of Cryogenic Fuel Targets 用于对低温燃料目标进行非接触式加速的组合悬浮马刀

IF 0.6 4区物理与天体物理

Bulletin of the Lebedev Physics Institute Pub Date : 2024-04-21 DOI: 10.3103/S1068335624600086

I. V. Aleksandrova, A. A. Akunets, E. R. Koresheva

引用次数: 0

New Nonlinear Optical Effect: 20-Fold Local Increase in Intensity in the Field of a Backward SRS Picosecond Pulse in Heavy Water 新的非线性光学效应：重水中后向 SRS 皮秒脉冲场的局部强度增加 20 倍

IF 0.6 4区物理与天体物理

Bulletin of the Lebedev Physics Institute Pub Date : 2024-04-21 DOI: 10.3103/S1068335623602169

S. M. Pershin, A. I. Vodchits, V. A. Orlovich, M. Ya. Grishin, I. A. Khodasevich

{"title":"New Nonlinear Optical Effect: 20-Fold Local Increase in Intensity in the Field of a Backward SRS Picosecond Pulse in Heavy Water","authors":"S. M. Pershin, A. I. Vodchits, V. A. Orlovich, M. Ya. Grishin, I. A. Khodasevich","doi":"10.3103/S1068335623602169","DOIUrl":"10.3103/S1068335623602169","url":null,"abstract":"We report for the first time, to our knowledge, the discovery of a new nonlinear optical effect in a stimulated Raman scattering (SRS) laser in heavy water as a Raman active medium: a 20-fold local increase in intensity of the backward SRS field up to the optical breakdown threshold (~40 TW/cm2) due to Kerr beam compression as the beam waist moves from bulk water to the surface at a constant pump pulse energy (57 ps, ~2 mJ, and 532 nm). The optical breakdown of water accompanied by ejection of droplets normally to the surface is achieved in a thin layer when the pump beam waist is located at a depth of 1‒3 mm. Outside this layer, the radiation intensity needed to achieve SRS does not exceed 2 TW/cm2. The detected energy concentration in a small volume indicates a high degree of spatiotemporal localization of summed Kerr nonlinear optical contributions to the refractive index and two-photon absorption coefficient, which leads to a local increase in field intensity and to an optical breakdown at a pulse energy 20 times lower than that in the absence of such summation of nonlinear optical contributions.","PeriodicalId":503,"journal":{"name":"Bulletin of the Lebedev Physics Institute","volume":null,"pages":null},"PeriodicalIF":0.6,"publicationDate":"2024-04-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140628074","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

Self-Action of Light Beams in an Amorphous Azobenzene Polymer 无定形偶氮苯聚合物中的光束自作用

IF 0.6 4区物理与天体物理

Bulletin of the Lebedev Physics Institute Pub Date : 2024-04-21 DOI: 10.3103/S1068335623602157

A. S. Zolot’ko, I. A. Budagovsky, A. I. Baranov, V. V. Lagunov, M. P. Smayev, A. A. Kuznetsov, A. Yu. Bobrovsky

{"title":"Self-Action of Light Beams in an Amorphous Azobenzene Polymer","authors":"A. S. Zolot’ko, I. A. Budagovsky, A. I. Baranov, V. V. Lagunov, M. P. Smayev, A. A. Kuznetsov, A. Yu. Bobrovsky","doi":"10.3103/S1068335623602157","DOIUrl":"10.3103/S1068335623602157","url":null,"abstract":"We report an experimental study of the self-action of TEM01 and TEM00 Gaussian modes in a layer of a comb-shaped amorphous polymer with cyanobiphenyl and azobenzene side fragments. For the linearly polarized TEM01 mode, a pattern of aberration self-action is observed in the form of rings with an additional system of the fringes, caused by interference from two intensity peaks. The position of the fringes and the microscopic image of the deformation region correspond to the local nature of the nonlinear optical response. For the circularly polarized (with an ellipticity of about 7%) TEM00 Gaussian mode, the polarization of the outer aberration ring is close to linear. This effect stems from the self-rotation of the polarization ellipse due to the manifestation of Kerr-type nonlinearity. A characteristic feature of this effect in an amorphous polymer is an increase in the eccentricity of the ellipse (transformation of circular polarization into linear polarization), which is caused by a light-induced change in the orientation distribution function of the chromophores.","PeriodicalId":503,"journal":{"name":"Bulletin of the Lebedev Physics Institute","volume":null,"pages":null},"PeriodicalIF":0.6,"publicationDate":"2024-04-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140630839","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 Radiation with a Tunable Comb Spectrum in Ring Fiber Cavities Based on Active Photonic Crystal Structures 在基于有源光子晶体结构的环形光纤腔中产生具有可调谐梳状频谱的辐射

IF 0.6 4区物理与天体物理

Bulletin of the Lebedev Physics Institute Pub Date : 2024-04-18 DOI: 10.3103/S1068335624600219

A. S. Abramov, D. A. Korobko, V. A. Lapin, P. P. Mironov

引用次数: 0

Tunable Optical Parametric Oscillator Based on MgO:PPLN and HgGa2S4 Crystals Pumped by an Nd:YAG Laser with Increased Energy Characteristics 基于 MgO:PPLN 和 HgGa2S4 晶体并由 Nd:YAG 激光器泵浦的可调光参量振荡器，具有更高的能量特性

IF 0.6 4区物理与天体物理

Bulletin of the Lebedev Physics Institute Pub Date : 2024-04-18 DOI: 10.3103/S1068335624600190

E. Yu. Erushin, M. D. Yakovin, N. I. Latkin, S. N. Podzyvalov, N. Yu. Kostyukova, A. A. Boyko

引用次数: 0

Four-Photon Mixing in Ghost Fiber Spectroscopy 幽灵光纤光谱中的四光子混合

IF 0.6 4区物理与天体物理

Bulletin of the Lebedev Physics Institute Pub Date : 2024-04-18 DOI: 10.3103/S1068335624600207

N. S. Starshinov, A. V. Belinsky, A. B. Fedotov

引用次数: 0

The System of Diffusion Filling with Hydrogen Isotopes for a Batch of Spherical Shells up to Pressures of 1000 atm at 300 K 在开氏 300 度、1000 个大气压条件下对一批球壳进行氢同位素扩散填充的系统

IF 0.6 4区物理与天体物理

Bulletin of the Lebedev Physics Institute Pub Date : 2024-04-18 DOI: 10.3103/S1068335624600128

I. V. Aleksandrova, E. R. Koresheva, I. E. Osipov, S. M. Tolokonnikov

{"title":"The System of Diffusion Filling with Hydrogen Isotopes for a Batch of Spherical Shells up to Pressures of 1000 atm at 300 K","authors":"I. V. Aleksandrova, E. R. Koresheva, I. E. Osipov, S. M. Tolokonnikov","doi":"10.3103/S1068335624600128","DOIUrl":"10.3103/S1068335624600128","url":null,"abstract":"The current promising developments in controlled inertial fusion energy (IFE) are aimed at creating a power facility for mass fabrication of cryogenic fuel targets (CFT) and their high rep-rate delivery to the irradiation zone of a powerful laser. To ensure continuous operation of a IFE reactor, the thermonuclear burn region should be refilled with fuel at the rate of about 1 million targets per day. At the same time, handling an array of free-standing CFTs at each step of a closed operation cycle is a key requirement for the reactor technology design. The first step in the CFT fabrication is filling of hollow spherical shells with a fuel, which is deuterium or a deuterium–tritium mixture. The CFT shells are made of polymer, glass, beryllium, or high-density carbon. In world practice, it is customary to carry out the filling step either by diffusion of fuel gas through the CFT shell wall or by injecting liquid fuel through a thin capillary (several microns in diameter) built into the shell wall. The latter method is extremely problematic for future applications because it disrupts the integrity and symmetry of the shell and precludes rep-rate injection of the CFT into the laser focus. Based on data from many experimental runs, we present results on the optimization of a diffusion filling system first developed at the Lebedev Physical Institute (LPI) for filling a batch of free-standing polymer and glass shells (dia. 0.8 to 2.0 mm) with hydrogen isotopes to pressures of 1000 atm at 300 K. These results are unique and have no counterparts in the world.","PeriodicalId":503,"journal":{"name":"Bulletin of the Lebedev Physics Institute","volume":null,"pages":null},"PeriodicalIF":0.6,"publicationDate":"2024-04-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140630453","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

Effect of Ion Motion on Generation and Lifetime of Magnetic Fields in a Cluster Plasma Irradiated with Intense Circularly Polarized Laser Pulses 离子运动对强圆偏振激光脉冲辐照簇等离子体中磁场的产生和寿命的影响

IF 0.6 4区物理与天体物理

Bulletin of the Lebedev Physics Institute Pub Date : 2024-04-18 DOI: 10.3103/S1068335624600141

A. A. Andreev, K. Yu. Platonov, L. A. Litvinov

引用次数: 0

Magnetic Force and Laser Excitation of Transverse Oscillations in Optical Microfibers 光学微纤维横向振荡的磁力和激光激励

IF 0.6 4区物理与天体物理

Bulletin of the Lebedev Physics Institute Pub Date : 2024-04-18 DOI: 10.3103/S1068335624600153

F. A. Egorov

{"title":"Magnetic Force and Laser Excitation of Transverse Oscillations in Optical Microfibers","authors":"F. A. Egorov","doi":"10.3103/S1068335624600153","DOIUrl":"10.3103/S1068335624600153","url":null,"abstract":"It is showed the possibility of contactless excitation of transverse oscillations in quartz optical microfibers (fiber microguides) due to their diamagnetic properties. The microguides are made from standard optical fibers by chemical etching and thermal drawing in an electric discharge arc. Dependences were found of resonance frequencies and Q factors of transverse oscillation modes of microguides on the ambient air density in a wide range of values corresponding to a pressure of 5 to 105 Pa. Laser excitation of transverse oscillations in microguides was implemented and possible mechanisms of this excitation are discussed. It was found that in vacuum the resonance frequencies of transverse oscillations in microguides under laser excitation conditions are noticeably higher than in the case of magnetic force excitation of oscillations. The magnetic force excitation of microguide oscillations is shown to be possible at significant distances (~1 mm) between a microguide and the source of inhomogeneous magnetic field. These findings can serve as a basis for the development of new types of optical fiber modulators controlled by magnetic field and/or laser radiation and for the design of resonant optical fiber optic sensors with sensitive elements, based on optical microfibers.","PeriodicalId":503,"journal":{"name":"Bulletin of the Lebedev Physics Institute","volume":null,"pages":null},"PeriodicalIF":0.6,"publicationDate":"2024-04-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140628068","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

Pyrolysis of Brown Coal Microparticles under the Action of Nanosecond First-Harmonic Pulses from a Neodymium Laser 在钕激光器发出的纳秒级第一谐波脉冲作用下的褐煤微粒热解

IF 0.6 4区物理与天体物理

Bulletin of the Lebedev Physics Institute Pub Date : 2024-04-18 DOI: 10.3103/S1068335624600116

B. P. Aduev, V. D. Volkov

引用次数: 0