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Self-Formation of Temporal Dark Solitons in a Single-Mode Optical Fiber 单模光纤中时间暗孤子的自形成
IF 0.5 4区 物理与天体物理
Journal of Contemporary Physics (Armenian Academy of Sciences) Pub Date : 2025-01-15 DOI: 10.1134/S1068337224700427
A. Kutuzyan, M. Sukiasyan, Ar. Kirakosyan, V. Avetisyan
{"title":"Self-Formation of Temporal Dark Solitons in a Single-Mode Optical Fiber","authors":"A. Kutuzyan,&nbsp;M. Sukiasyan,&nbsp;Ar. Kirakosyan,&nbsp;V. Avetisyan","doi":"10.1134/S1068337224700427","DOIUrl":"10.1134/S1068337224700427","url":null,"abstract":"<p>The process of dark pulse formation in a dispersion delay line using amplitude-phase filtering and, subsequently, self-formation of a dark soliton from it in a single-mode optical fiber has been investigated. A dispersive delay line is a system widely used in ultrashort pulse generation applications, consisting of a pair of diffraction gratings or prisms and a beam-returning mirror, in which the laser pulse is stretched and given a negative chirp. The magnitude of the error in fulfilling the conditions necessary for the self-formation of dark solitons has been estimated. A detailed study of the features of the radiation spectrum containing a dark soliton was carried out. The stability of the region corresponding to the dark soliton in the spectrum and its two-peak nature, which is of interest for ultrafast spectroscopy, were revealed.</p>","PeriodicalId":623,"journal":{"name":"Journal of Contemporary Physics (Armenian Academy of Sciences)","volume":"59 3","pages":"238 - 243"},"PeriodicalIF":0.5,"publicationDate":"2025-01-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142994591","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
Experimental Investigation of X-Ray LLL Interferometers with a Wedge-Shaped Mirror Block and the Hard Bases 楔形镜块硬基x射线LLL干涉仪的实验研究
IF 0.5 4区 物理与天体物理
Journal of Contemporary Physics (Armenian Academy of Sciences) Pub Date : 2025-01-15 DOI: 10.1134/S1068337224700403
T. H. Eyramjyan, T. S. Mnatsakanyan
{"title":"Experimental Investigation of X-Ray LLL Interferometers with a Wedge-Shaped Mirror Block and the Hard Bases","authors":"T. H. Eyramjyan,&nbsp;T. S. Mnatsakanyan","doi":"10.1134/S1068337224700403","DOIUrl":"10.1134/S1068337224700403","url":null,"abstract":"<p>Two X-ray LLL interferometers are investigated experimentally and with some theoretical explanations: one with a wedge-shaped mirror block and the other one is called hard. The received interference images show that the moiré images are also superposed on the pendellözung fringes in the roentgenograms obtained from the interferometers with a wedge-shaped mirror block and do not interact. The period of pendellözung fringes does not change after passing through the analyzer. The theory of the eikonal approximation of interference fringes formation in the interferometer with a wedge-shaped mirror plate gives predictions that coincide with the obtained experimental results. Unlike a typical LLL X-ray interferometer, the hard one has a base and a “ceiling”. The hard interferometer does not produce uncontrolled moiré thanks to such a structure. The latter occurs because of the interferometer plate deformations: the hard interferometer is much more sensitive to mechanical stresses and various external factors.</p>","PeriodicalId":623,"journal":{"name":"Journal of Contemporary Physics (Armenian Academy of Sciences)","volume":"59 3","pages":"342 - 346"},"PeriodicalIF":0.5,"publicationDate":"2025-01-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142994752","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
Binding Parameters of CuTAllPyP4 and CoTAllPyP4 Porphyrins to DNA Using Adsorption Isotherms CuTAllPyP4和CoTAllPyP4卟啉与DNA的吸附等温线结合参数
IF 0.5 4区 物理与天体物理
Journal of Contemporary Physics (Armenian Academy of Sciences) Pub Date : 2025-01-15 DOI: 10.1134/S106833722470035X
G. V. Ananyan, N. H. Karapetyan, Y. B. Dalyan, R. S. Ghazaryan, S. G. Haroutiunian
{"title":"Binding Parameters of CuTAllPyP4 and CoTAllPyP4 Porphyrins to DNA Using Adsorption Isotherms","authors":"G. V. Ananyan,&nbsp;N. H. Karapetyan,&nbsp;Y. B. Dalyan,&nbsp;R. S. Ghazaryan,&nbsp;S. G. Haroutiunian","doi":"10.1134/S106833722470035X","DOIUrl":"10.1134/S106833722470035X","url":null,"abstract":"<p>A comparative study of the binding parameters of cationic porphyrins CuTAllPyP4 and CoTAllPyP4 with DNA was conducted based on spectroscopic adsorption isotherms depending on the ionic strength of the solution. The obtained results show that the binding constant of the porphyrin CoTAllPyP4 with DNA is an order of magnitude lower than the binding constant of CuTAllPyP4 regardless of the ionic strength. The presence of hard allylic side radicals with increasing ionic strength increases the tendency of porphyrins to aggregate and form sandwich-like ensembles on the DNA macromolecule (<i>H</i>-aggregates), which leads to a hypsochromic shift in the electronic absorption spectra of the porphyrins CuTAllPyP4 and CoTAllPyP4 regardless of the type of central metal and spatial structure.</p>","PeriodicalId":623,"journal":{"name":"Journal of Contemporary Physics (Armenian Academy of Sciences)","volume":"59 3","pages":"347 - 352"},"PeriodicalIF":0.5,"publicationDate":"2025-01-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142994720","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
Coherent Control of Lowest States of a Shallow Impurity in Graphene Monolayer by Phase Modulated Laser Pulses 相位调制激光脉冲相干控制石墨烯单层中浅层杂质的最低态
IF 0.5 4区 物理与天体物理
Journal of Contemporary Physics (Armenian Academy of Sciences) Pub Date : 2025-01-15 DOI: 10.1134/S1068337224700397
A. P. Djotyan, G. P. Djotyan, A. A. Avetisyan
{"title":"Coherent Control of Lowest States of a Shallow Impurity in Graphene Monolayer by Phase Modulated Laser Pulses","authors":"A. P. Djotyan,&nbsp;G. P. Djotyan,&nbsp;A. A. Avetisyan","doi":"10.1134/S1068337224700397","DOIUrl":"10.1134/S1068337224700397","url":null,"abstract":"<p>The energies of the ground 1<i>S</i> and first excited states 2<i>P,</i> 2<i>S</i> of a shallow donor impurity in graphene monolayer with opened energy gap in a perpendicular magnetic field are obtained using a variational approach. It is shown that the energies of the lowest states and distance between them can be tuned in the region of few ten meV by changing the value of the fine structure parameter and magnitude of the magnetic field. A model of a soft Coulomb interaction is suggested. On the basis of the results obtained, the dipole matrix elements for optical transitions 1<i>S –</i>2<i>P</i><sup><i>+</i></sup> and 2<i>S</i> –2<i>P</i><sup><i>+</i></sup> are calculated. In the next step, coherent population transfer between the two metastable states 1<i>S</i> and 2<i>S</i> produced by a single phase modulated (frequency chirped) laser pulse is considered. It is demonstrated that such population transfer may be performed without considerable population of the excited state 2<i>P</i><sup><i>+</i></sup> if initially population of the quantum system under consideration is localized in one of the metastable states. Additionally, the case when the system is in superposition of two metastable states initially is investigated.</p>","PeriodicalId":623,"journal":{"name":"Journal of Contemporary Physics (Armenian Academy of Sciences)","volume":"59 3","pages":"272 - 278"},"PeriodicalIF":0.5,"publicationDate":"2025-01-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142994717","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
Influence of Noise Distortions of the Spectral Phase on the Profile of an Ultrashort Pulse 频谱相位噪声失真对超短脉冲轮廓的影响
IF 0.5 4区 物理与天体物理
Journal of Contemporary Physics (Armenian Academy of Sciences) Pub Date : 2024-11-18 DOI: 10.1134/S1068337224700208
V. Avetisyan, M. Sukiasyan, A. Avetisyan, A. Kirakosyan, A. Kutuzyan
{"title":"Influence of Noise Distortions of the Spectral Phase on the Profile of an Ultrashort Pulse","authors":"V. Avetisyan,&nbsp;M. Sukiasyan,&nbsp;A. Avetisyan,&nbsp;A. Kirakosyan,&nbsp;A. Kutuzyan","doi":"10.1134/S1068337224700208","DOIUrl":"10.1134/S1068337224700208","url":null,"abstract":"<p>Based on numerical and experimental studies, an analysis of the influence of the noise component in determining the spectral phase of an ultrashort pulse in the problems of reconstructing the pulse profile was carried out. Additive white noise was considered and it was shown that the error in field reconstruction becomes proportional to the product of the spectral amplitude and the error in determining the spectral phase at small values of the latter. The results obtained are applied to the technique of determining the spectral phase based on the dispersion Fourier transform. The high accuracy of the method and the possibility of its use as an effective technique were discussed. The spectral phases of double-peak pulses formed from a 120 fs laser pulse with a known spectral phase were experimentally determined, and the error in determining the spectral phase and reconstructing the pulse field was assessed.</p>","PeriodicalId":623,"journal":{"name":"Journal of Contemporary Physics (Armenian Academy of Sciences)","volume":"59 2","pages":"149 - 153"},"PeriodicalIF":0.5,"publicationDate":"2024-11-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142672692","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
Stationary States of an Electron in a Prolate Spheroidal Quantum Dot Prolate Spheroidal 量子点中电子的静止状态
IF 0.5 4区 物理与天体物理
Journal of Contemporary Physics (Armenian Academy of Sciences) Pub Date : 2024-11-18 DOI: 10.1134/S1068337224700269
M. V. Hayrapetyan, A. Zh. Muradyan
{"title":"Stationary States of an Electron in a Prolate Spheroidal Quantum Dot","authors":"M. V. Hayrapetyan,&nbsp;A. Zh. Muradyan","doi":"10.1134/S1068337224700269","DOIUrl":"10.1134/S1068337224700269","url":null,"abstract":"<p>The stationary states of an electron in a nanosized semiconductor quantum dot of spheroidal shape with a deep confining potential are considered. The discrete energy spectrum and corresponding wave functions are very sensitive to the elongation, especially in the region of high eccentricity values. The main attention is paid to identifying the patterns of the radial-angular distribution of electron wave functions, which should play an important role in the angular distribution of photons emitted by the quantum dot.</p>","PeriodicalId":623,"journal":{"name":"Journal of Contemporary Physics (Armenian Academy of Sciences)","volume":"59 2","pages":"144 - 148"},"PeriodicalIF":0.5,"publicationDate":"2024-11-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142672690","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
Thermodynamic Parameters of Binding of Small Molecules to DNA Irradiated by Low-Intensity Millimeter Electromagnetic Waves 小分子与低强度毫米电磁波辐照 DNA 结合的热力学参数
IF 0.5 4区 物理与天体物理
Journal of Contemporary Physics (Armenian Academy of Sciences) Pub Date : 2024-11-18 DOI: 10.1134/S1068337224700270
V. P. Kalantaryan, R. S. Ghazaryan, Yu. S. Babayan
{"title":"Thermodynamic Parameters of Binding of Small Molecules to DNA Irradiated by Low-Intensity Millimeter Electromagnetic Waves","authors":"V. P. Kalantaryan,&nbsp;R. S. Ghazaryan,&nbsp;Yu. S. Babayan","doi":"10.1134/S1068337224700270","DOIUrl":"10.1134/S1068337224700270","url":null,"abstract":"<p>The interaction of biologically active molecules (BAM) with the biopolymer DNA, which performs the most important functions in a living organism having a double helical structure, irradiated with non-thermal electromagnetic millimeter waves, has been studied. It has been shown, that BAM (doxorubicin, mitoxantrone, and netropsin) form more stable complexes with DNA irradiated with the resonant frequencies of natural vibrations of the molecular structures of water (64.5 and 50.3 GHz). Under the influence of the above non-thermal millimeter waves, dehydration of the DNA molecule occurs, which leads to an increase in the binding constant of BAM to irradiated DNA. Calculations show that as a result of irradiation, the thermodynamic parameters of the binding of BAM to DNA change-enthalpy (Δ<i>H</i>) and entropy (Δ<i>S</i>): For all studied BAM, Δ<i>H</i> &lt; 0, and Δ<i>S</i> &gt; 0. The greatest change in entropy occurs for netropsin that binds externally to DNA.</p>","PeriodicalId":623,"journal":{"name":"Journal of Contemporary Physics (Armenian Academy of Sciences)","volume":"59 2","pages":"228 - 232"},"PeriodicalIF":0.5,"publicationDate":"2024-11-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142672576","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
Thermodynamics of an Ideal Electron Gas Localized in a Thin Spherical CdSe Nanolayer 薄球形硒化镉纳米层中局部理想电子气的热力学
IF 0.5 4区 物理与天体物理
Journal of Contemporary Physics (Armenian Academy of Sciences) Pub Date : 2024-11-18 DOI: 10.1134/S1068337224700312
L. A. Tadevosyan, V. A. Stepanyan, H. T. Ghaltaghchyan, E. S. Mamasakhlisov, H. A. Sarkisyan
{"title":"Thermodynamics of an Ideal Electron Gas Localized in a Thin Spherical CdSe Nanolayer","authors":"L. A. Tadevosyan,&nbsp;V. A. Stepanyan,&nbsp;H. T. Ghaltaghchyan,&nbsp;E. S. Mamasakhlisov,&nbsp;H. A. Sarkisyan","doi":"10.1134/S1068337224700312","DOIUrl":"10.1134/S1068337224700312","url":null,"abstract":"<p>The thermodynamic characteristics of an electron gas localized in a thin spherical CdSe nanolayer have been studied. The dimensions of the CdTe/CdSe core-shell type quantum dot are considered large, which allows the gas to be considered ideal. Due to the small thickness, the particle spectrum has a subband character, when a family of levels of the spherical rotator is associated with each radial quantization level. Within the framework of Boltzmann statistics, the statistical sum for the gas under study was determined, as well as the mean energy, entropy, and heat capacity. The dependences of the thermodynamic characteristics of the electron gas on the geometric parameters of a CdTe/CdSe quantum dot have been studied.</p>","PeriodicalId":623,"journal":{"name":"Journal of Contemporary Physics (Armenian Academy of Sciences)","volume":"59 2","pages":"172 - 178"},"PeriodicalIF":0.5,"publicationDate":"2024-11-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142672584","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
Influence of Self-Focused Elliptical Laser Beam on Second Harmonic Generation in Cold Quantum Plasma 自聚焦椭圆激光束对冷量子等离子体中二次谐波产生的影响
IF 0.5 4区 物理与天体物理
Journal of Contemporary Physics (Armenian Academy of Sciences) Pub Date : 2024-11-18 DOI: 10.1134/S1068337224700300
K. Singh, K. Walia
{"title":"Influence of Self-Focused Elliptical Laser Beam on Second Harmonic Generation in Cold Quantum Plasma","authors":"K. Singh,&nbsp;K. Walia","doi":"10.1134/S1068337224700300","DOIUrl":"10.1134/S1068337224700300","url":null,"abstract":"<p>The present work investigates influence of self-focused elliptical laser beam on second harmonic generation (SHG) in cold quantum plasma (CQP). There is establishment of transverse intensity gradients on account of self-focused elliptical laser beam in relativistic plasma. These intensity gradients cause excitation of electron plasma wave (EPW) at pump beam’s frequency. Excited EPW interacts nonlinearly with pump wave thereby producing 2nd harmonics. The nonlinear differential equations representing beam waist’s behavior against normalized distance is derived through Wentzel, Kramers and Brillouin (WKB), approach and paraxial theory. Nonlinear Ordinary differential equation (ODE) is solved numerically in order to explore effect of distinct laser-plasma parameters and quantum contribution on beam waist of pump wave and 2nd harmonics efficiency. The present outcome is compared with classical relativistic plasma (CRP) case.</p>","PeriodicalId":623,"journal":{"name":"Journal of Contemporary Physics (Armenian Academy of Sciences)","volume":"59 2","pages":"154 - 164"},"PeriodicalIF":0.5,"publicationDate":"2024-11-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142672693","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
Features of Spherical X-Ray Wave Diffraction by a Low Angle Twist Boundary Perpendicular to the Crystal Surface 垂直于晶体表面的低角度扭曲边界的球形 X 射线波衍射特征
IF 0.5 4区 物理与天体物理
Journal of Contemporary Physics (Armenian Academy of Sciences) Pub Date : 2024-11-18 DOI: 10.1134/S1068337224700282
L. V. Levonyan, H. M. Manukyan
{"title":"Features of Spherical X-Ray Wave Diffraction by a Low Angle Twist Boundary Perpendicular to the Crystal Surface","authors":"L. V. Levonyan,&nbsp;H. M. Manukyan","doi":"10.1134/S1068337224700282","DOIUrl":"10.1134/S1068337224700282","url":null,"abstract":"<p>An X-ray point source was used to examine the diffraction behavior of a low-angle twist boundary. It is shown that when radiation is focused inside a crystal, because of the dislocation structure of the defect wall, the vertical divergence can be reduced so much that the size of the focus in this direction is significantly smaller than in the horizontal direction. This circumstance can be used to create X-ray optical elements.</p>","PeriodicalId":623,"journal":{"name":"Journal of Contemporary Physics (Armenian Academy of Sciences)","volume":"59 2","pages":"214 - 218"},"PeriodicalIF":0.5,"publicationDate":"2024-11-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142672579","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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