Pub Date : 2024-06-17DOI: 10.3103/s1068335624600499
I. A. Pshenichnyuk, K. N. Garbuzov, D. S. Zemtsov, Yu. G. Gladush, S. S. Kosolobov
Abstract
A simple scheme is proposed that allows one to verify the effect of nonlinear properties of an indium-tin oxide film on the transmittance of integrated silicon waveguides. In the proposed implementation, the transmittance of the waveguide depends on the transmitted light intensity. The scheme is adapted for direct experimental verification. To calculate characteristics and optimize geometry, nonlinear Maxwell equations are solved numerically in frequency space. Nonlinearity is introduced into the equations as a general function, without the usual expansion in a series in powers of the field, and is parameterized on the basis of experimental data. Simulation is performed in three-dimensional space.
{"title":"Change in Transmittance of Indium-Tin-Oxide-Coated Silicon Waveguides Exposed to Intense Light Pulses","authors":"I. A. Pshenichnyuk, K. N. Garbuzov, D. S. Zemtsov, Yu. G. Gladush, S. S. Kosolobov","doi":"10.3103/s1068335624600499","DOIUrl":"https://doi.org/10.3103/s1068335624600499","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>A simple scheme is proposed that allows one to verify the effect of nonlinear properties of an indium-tin oxide film on the transmittance of integrated silicon waveguides. In the proposed implementation, the transmittance of the waveguide depends on the transmitted light intensity. The scheme is adapted for direct experimental verification. To calculate characteristics and optimize geometry, nonlinear Maxwell equations are solved numerically in frequency space. Nonlinearity is introduced into the equations as a general function, without the usual expansion in a series in powers of the field, and is parameterized on the basis of experimental data. Simulation is performed in three-dimensional space.</p>","PeriodicalId":503,"journal":{"name":"Bulletin of the Lebedev Physics Institute","volume":null,"pages":null},"PeriodicalIF":0.4,"publicationDate":"2024-06-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141509033","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}
Pub Date : 2024-06-17DOI: 10.3103/s1068335624600608
D. V. Gulyaev, K. S. Zhuravlev
Abstract
The review examines telecom electro-optic modulators made of group III–V compound semiconductor material composed of indium phosphide. The operation principles of modulators and issues of heterostructure and modulator design optimization are considered; the results of recent developments and the achieved parameters of modulators are presented.
{"title":"InP-Based Electro-Optic and Electro-Absorption Modulators for the 1.5-μm Spectral Range","authors":"D. V. Gulyaev, K. S. Zhuravlev","doi":"10.3103/s1068335624600608","DOIUrl":"https://doi.org/10.3103/s1068335624600608","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>The review examines telecom electro-optic modulators made of group III–V compound semiconductor material composed of indium phosphide. The operation principles of modulators and issues of heterostructure and modulator design optimization are considered; the results of recent developments and the achieved parameters of modulators are presented.</p>","PeriodicalId":503,"journal":{"name":"Bulletin of the Lebedev Physics Institute","volume":null,"pages":null},"PeriodicalIF":0.4,"publicationDate":"2024-06-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141509079","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}
Pub Date : 2024-06-17DOI: 10.3103/s1068335624600529
S. O. Leonov, T. V. Eremin, M. P. Frolov, Yu. V. Korostelin, Ya. K. Skasyrsky, E. D. Obraztsova, V. I. Kozlovsky
Abstract
The ultrashort pulse laser based on a Cr2+:ZnSe monocrystal has been presented, utilizing carbon nanotubes as a saturable absorber. The saturable absorber consists of a sapphire substrate onto which nanotubes are deposited. Such a structure enables the realization of an element capable of simultaneously functioning as a saturable absorber and as a compensator for intracavity dispersion, as the substrate thickness can be chosen during fabrication, allowing for the adjustment of the introduced dispersion. Several laser resonator configurations are discussed, demonstrating the possibility of generating ultrashort laser pulses with durations down to 160 fs, a repetition rate of 135 MHz, an output power of 17 mW, and a central wavelength of 2.45 µm.
{"title":"Femtosecond Cr2+:ZnSe Laser with Mode-Locking Based on Carbon Nanotubes","authors":"S. O. Leonov, T. V. Eremin, M. P. Frolov, Yu. V. Korostelin, Ya. K. Skasyrsky, E. D. Obraztsova, V. I. Kozlovsky","doi":"10.3103/s1068335624600529","DOIUrl":"https://doi.org/10.3103/s1068335624600529","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>The ultrashort pulse laser based on a Cr<sup>2+</sup>:ZnSe monocrystal has been presented, utilizing carbon nanotubes as a saturable absorber. The saturable absorber consists of a sapphire substrate onto which nanotubes are deposited. Such a structure enables the realization of an element capable of simultaneously functioning as a saturable absorber and as a compensator for intracavity dispersion, as the substrate thickness can be chosen during fabrication, allowing for the adjustment of the introduced dispersion. Several laser resonator configurations are discussed, demonstrating the possibility of generating ultrashort laser pulses with durations down to 160 fs, a repetition rate of 135 MHz, an output power of 17 mW, and a central wavelength of 2.45 µm.</p>","PeriodicalId":503,"journal":{"name":"Bulletin of the Lebedev Physics Institute","volume":null,"pages":null},"PeriodicalIF":0.4,"publicationDate":"2024-06-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141515746","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}
Pub Date : 2024-06-17DOI: 10.3103/s106833562460058x
S. A. Belkov, B. G. Zimalin, P. Yu. Kruglov, A. O. Lipatov, A. N. Manachinskii, A. V. Yakhlov
Abstract
We report an investigation of an adaptive system designed to correct the wavefront of laser beams up to 400 × 400 mm in size using a new generation multichannel laser facility. An algorithm is developed for the operation of the adaptive system to determine and correct wavefront aberrations of the laser beam in the amplification path without and with pumping slabs based on neodymium phosphate glass. Characteristic thermal aberrations of the amplification path that occur under slabs pumping are presented. A possibility of compensating for thermal aberrations in the amplifier path and the formation of a laser beam with an energy of up to 25 kJ and wavefront parameters of PV ≈ 1.4 μm and RMS ≈ 0.2 μm are experimentally demonstrated.
{"title":"Wavefront Correction on a New Generation Multichannel High-Power Laser Facility","authors":"S. A. Belkov, B. G. Zimalin, P. Yu. Kruglov, A. O. Lipatov, A. N. Manachinskii, A. V. Yakhlov","doi":"10.3103/s106833562460058x","DOIUrl":"https://doi.org/10.3103/s106833562460058x","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>We report an investigation of an adaptive system designed to correct the wavefront of laser beams up to 400 × 400 mm in size using a new generation multichannel laser facility. An algorithm is developed for the operation of the adaptive system to determine and correct wavefront aberrations of the laser beam in the amplification path without and with pumping slabs based on neodymium phosphate glass. Characteristic thermal aberrations of the amplification path that occur under slabs pumping are presented. A possibility of compensating for thermal aberrations in the amplifier path and the formation of a laser beam with an energy of up to 25 kJ and wavefront parameters of PV ≈ 1.4 μm and RMS ≈ 0.2 μm are experimentally demonstrated.</p>","PeriodicalId":503,"journal":{"name":"Bulletin of the Lebedev Physics Institute","volume":null,"pages":null},"PeriodicalIF":0.4,"publicationDate":"2024-06-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141515747","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}
Pub Date : 2024-05-24DOI: 10.3103/s1068335623601905
V. A. Babenko, A. A. Sychev
Abstract
We report experimental results of using the resonator-loss-unloading method to implement relaxation properties of a passive shutter in an Nd3+:YAG laser with the aim of producing extremely short picosecond pulses. The application of a fast relaxing passive shutter based on a technologically advanced new pyrillocyanine dye and the use of the unloading method make it possible to obtain highly reproducible, ultrashort 7-ps light pulses from this laser.
{"title":"Implementation of the Regeneration Regime in the Process of Generating Extremely Short Pulses in an Nd3+: YAG Laser with a Passive Shutter","authors":"V. A. Babenko, A. A. Sychev","doi":"10.3103/s1068335623601905","DOIUrl":"https://doi.org/10.3103/s1068335623601905","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>We report experimental results of using the resonator-loss-unloading method to implement relaxation properties of a passive shutter in an Nd<sup>3+</sup>:YAG laser with the aim of producing extremely short picosecond pulses. The application of a fast relaxing passive shutter based on a technologically advanced new pyrillocyanine dye and the use of the unloading method make it possible to obtain highly reproducible, ultrashort 7-ps light pulses from this laser.</p>","PeriodicalId":503,"journal":{"name":"Bulletin of the Lebedev Physics Institute","volume":null,"pages":null},"PeriodicalIF":0.4,"publicationDate":"2024-05-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141149389","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}
Pub Date : 2024-05-24DOI: 10.3103/s1068335623602303
A. G. Turyanskiy, T. A. Akhadov, Kyaw Zaw Lin, V. M. Senkov, M. Z. Ziyatdinova, M. V. Ublinskii, D. M. Dmitrienko, M. Yu. Kupriyanov, M. M. Aksenova
Abstract
We demonstrate a possibility of a radical reduction in an effective radiation dose when monitoring the content of a contrast agent in an object with X-ray absorption spectroscopy (XAS) using survey data from multispiral computed tomography (CT). A directional beam passes through the region of interest, the 3D coordinates of which are determined with CT, and the transmission spectrum is recorded in the range of the K-jump in the X-ray photoabsorption of the contrast agent. The unambiguity of the obtained results is confirmed by independent measurements of the xenon content in the phantom using CT and XAS methods, as well as by direct manometric control of gas volumes.
摘要 我们展示了利用多螺旋计算机断层扫描（CT）的勘测数据，通过 X 射线吸收光谱（XAS）监测物体中造影剂含量时，从根本上减少有效辐射剂量的可能性。定向光束穿过相关区域（其三维坐标由 CT 确定），在造影剂的 X 射线光吸收 K 跳变范围内记录透射光谱。通过使用 CT 和 XAS 方法对模型中的氙含量进行独立测量，以及对气体体积进行直接人工控制，都证实了所获得结果的准确性。
{"title":"Quantitative Determination of a Contrast Agent by Multispiral Computed Tomography and Targeted Absorption Spectroscopy in the K-Jump Region of X-Ray Photoabsorption","authors":"A. G. Turyanskiy, T. A. Akhadov, Kyaw Zaw Lin, V. M. Senkov, M. Z. Ziyatdinova, M. V. Ublinskii, D. M. Dmitrienko, M. Yu. Kupriyanov, M. M. Aksenova","doi":"10.3103/s1068335623602303","DOIUrl":"https://doi.org/10.3103/s1068335623602303","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>We demonstrate a possibility of a radical reduction in an effective radiation dose when monitoring the content of a contrast agent in an object with X-ray absorption spectroscopy (XAS) using survey data from multispiral computed tomography (CT). A directional beam passes through the region of interest, the 3D coordinates of which are determined with CT, and the transmission spectrum is recorded in the range of the <i>K</i>-jump in the X-ray photoabsorption of the contrast agent. The unambiguity of the obtained results is confirmed by independent measurements of the xenon content in the phantom using CT and XAS methods, as well as by direct manometric control of gas volumes.</p>","PeriodicalId":503,"journal":{"name":"Bulletin of the Lebedev Physics Institute","volume":null,"pages":null},"PeriodicalIF":0.4,"publicationDate":"2024-05-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141149462","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}
Pub Date : 2024-05-24DOI: 10.3103/s1068335623600997
S. Yu. Gavrilkin, A. Yu. Tsvetkov
Abstract
A simple model for calculating the distribution of currents induced in a thin superconducting film by local AC magnetic field of a measuring coil is presented. The spatial distribution of the peak values of the current density in a sample is obtained, and the spectral composition of the response signal is considered depending on the amplitude of the drive current. The applicability of the model to real samples is presented.
{"title":"A Simple Model for the Induction Current Distribution in a Thin Superconducting Film","authors":"S. Yu. Gavrilkin, A. Yu. Tsvetkov","doi":"10.3103/s1068335623600997","DOIUrl":"https://doi.org/10.3103/s1068335623600997","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>A simple model for calculating the distribution of currents induced in a thin superconducting film by local AC magnetic field of a measuring coil is presented. The spatial distribution of the peak values of the current density in a sample is obtained, and the spectral composition of the response signal is considered depending on the amplitude of the drive current. The applicability of the model to real samples is presented.</p>","PeriodicalId":503,"journal":{"name":"Bulletin of the Lebedev Physics Institute","volume":null,"pages":null},"PeriodicalIF":0.4,"publicationDate":"2024-05-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141149386","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}
Pub Date : 2024-05-24DOI: 10.3103/s1068335623601826
O. V. Kuznetsov, M. M. Evseev, E. A. Batrakova, I. O. Antonov
Abstract
Ionization energies are calculated for complex organic molecules formed in the nonequilibrium ethanol–carbon monoxide reaction in interstellar ices. The obtained ionization energies allow molecular structures of C3H6O2 isomers to be determined in the laboratory conditions. Out of seven isomers in question, only ethyl formate is shown to be stable with respect to photoionization by Lyman-α photons (10.2 eV) in the interstellar medium.
{"title":"Ionization Energy of Reaction Products in an Ethanol–Carbon Monoxide System in Interstellar Ices","authors":"O. V. Kuznetsov, M. M. Evseev, E. A. Batrakova, I. O. Antonov","doi":"10.3103/s1068335623601826","DOIUrl":"https://doi.org/10.3103/s1068335623601826","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>Ionization energies are calculated for complex organic molecules formed in the nonequilibrium ethanol–carbon monoxide reaction in interstellar ices. The obtained ionization energies allow molecular structures of C<sub>3</sub>H<sub>6</sub>O<sub>2</sub> isomers to be determined in the laboratory conditions. Out of seven isomers in question, only ethyl formate is shown to be stable with respect to photoionization by Lyman-α photons (10.2 eV) in the interstellar medium.</p>","PeriodicalId":503,"journal":{"name":"Bulletin of the Lebedev Physics Institute","volume":null,"pages":null},"PeriodicalIF":0.4,"publicationDate":"2024-05-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141149466","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}
Pub Date : 2024-05-24DOI: 10.3103/s1068335623602182
S. N. Nikolaev, V. S. Krivobok, M. A. Chernopitssky, E. A. Ekimov, M. V. Kondrin
Abstract
We report an investigation of the CSn-center luminescent properties in the 2H SnS2 polytype over a wide temperature range. It is shown that in the temperature range from 5 to 200 K, the emission spectrum can be described in terms of the interaction of an electronic transition in the region of 1.4 eV with a localized phonon mode, whose frequency is 270 cm‒1. At temperatures exceeding 200 K, structural rearrangement of the center is observed, which manifests itself in qualitative changes in the emission spectrum and luminescence quantum yield.
摘要 我们报告了对 2H SnS2 聚合物中 CSn 中心发光特性在宽温度范围内的研究。研究表明，在 5 至 200 K 的温度范围内，发射光谱可以用 1.4 eV 区域的电子转变与频率为 270 cm-1 的局部声子模式的相互作用来描述。当温度超过 200 K 时，会观察到中心的结构重排，这表现在发射光谱和发光量子产率的质变上。
{"title":"Luminescent Properties of the Jahn‒Teller Center in Carbon-Doped Tin Disulfide","authors":"S. N. Nikolaev, V. S. Krivobok, M. A. Chernopitssky, E. A. Ekimov, M. V. Kondrin","doi":"10.3103/s1068335623602182","DOIUrl":"https://doi.org/10.3103/s1068335623602182","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>We report an investigation of the C<sub>Sn</sub>-center luminescent properties in the 2H SnS<sub>2</sub> polytype over a wide temperature range. It is shown that in the temperature range from 5 to 200 K, the emission spectrum can be described in terms of the interaction of an electronic transition in the region of 1.4 eV with a localized phonon mode, whose frequency is 270 cm<sup>‒1</sup>. At temperatures exceeding 200 K, structural rearrangement of the center is observed, which manifests itself in qualitative changes in the emission spectrum and luminescence quantum yield.</p>","PeriodicalId":503,"journal":{"name":"Bulletin of the Lebedev Physics Institute","volume":null,"pages":null},"PeriodicalIF":0.4,"publicationDate":"2024-05-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141149393","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}
Pub Date : 2024-05-24DOI: 10.3103/s1068335623600705
A. E. Volvach, L. N. Volvach, M. G. Larionov, V. B. Orlenson, S. V. Malashevich
Abstract
We report new data on AO 0235+164, obtained under the program of long-term multifrequency monitoring of active galactic nuclei (AGNs). A model is proposed for finding the parameters of close binary systems of supermassive black holes (SMBHs) by using only observational data in the radio range. The methodology for determining the physical characteristics of the SMBHs includes harmonic and wavelet analyses as well as the assessment of the masses of the satellites and their orbital characteristics. It is shown that AO 0235+164 can be a very massive and close binary system containing companions with similar masses. The presence of an orbital period and a multiple half-period indicates the absence of noticeable eccentricity in the system. Estimates show that, along with such AGNs as 3C 454.3 and OJ 287, AO 0235+164 can be a high-power gravitational wave (GW) emitter accessible for detection by gravitational wave detectors such as the International Pulsar Timing Array (IPTA).
{"title":"Determination of the Parameters of Binary Supermassive Black Holes and the Level of Their Gravitational Radiation","authors":"A. E. Volvach, L. N. Volvach, M. G. Larionov, V. B. Orlenson, S. V. Malashevich","doi":"10.3103/s1068335623600705","DOIUrl":"https://doi.org/10.3103/s1068335623600705","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>We report new data on AO 0235+164, obtained under the program of long-term multifrequency monitoring of active galactic nuclei (AGNs). A model is proposed for finding the parameters of close binary systems of supermassive black holes (SMBHs) by using only observational data in the radio range. The methodology for determining the physical characteristics of the SMBHs includes harmonic and wavelet analyses as well as the assessment of the masses of the satellites and their orbital characteristics. It is shown that AO 0235+164 can be a very massive and close binary system containing companions with similar masses. The presence of an orbital period and a multiple half-period indicates the absence of noticeable eccentricity in the system. Estimates show that, along with such AGNs as 3C 454.3 and OJ 287, AO 0235+164 can be a high-power gravitational wave (GW) emitter accessible for detection by gravitational wave detectors such as the International Pulsar Timing Array (IPTA).</p>","PeriodicalId":503,"journal":{"name":"Bulletin of the Lebedev Physics Institute","volume":null,"pages":null},"PeriodicalIF":0.4,"publicationDate":"2024-05-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141149377","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}
扫码关注我们
求助内容：
应助结果提醒方式：
京公网安备 11010802042870号