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Evaluation of Millimetron Observatory Capabilities in Interferometer Mode Using Multifrequency Synthesis 利用多频合成评估毫米波天文台在干涉仪模式下的能力
IF 0.6 4区 物理与天体物理
Bulletin of the Lebedev Physics Institute Pub Date : 2024-08-05 DOI: 10.3103/S1068335624600414
A. G. Rudnitskiy, M. A. Shchurov
{"title":"Evaluation of Millimetron Observatory Capabilities in Interferometer Mode Using Multifrequency Synthesis","authors":"A. G. Rudnitskiy,&nbsp;M. A. Shchurov","doi":"10.3103/S1068335624600414","DOIUrl":"10.3103/S1068335624600414","url":null,"abstract":"<p>The paper examines the possibilities of using the multifrequency synthesis method to improve the quality of images obtained by the space-ground very long baseline radio interferometer mode of the Millimetron observatory. Simulation of imaging observations for the close vicinity of the supermassive black hole M87 was carried out. The advantages of multifrequency synthesis compared to single-frequency observations are shown. The requirements and limitations of its applicability to space-ground interferometry with the Millimetron observatory are formulated.</p>","PeriodicalId":503,"journal":{"name":"Bulletin of the Lebedev Physics Institute","volume":null,"pages":null},"PeriodicalIF":0.6,"publicationDate":"2024-08-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141931466","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
On the Spectrum of Geomagnetic Radio Emission from Extensive Air Showers in a Kinetic Model 论动力学模型中广泛气流的地磁无线电发射频谱
IF 0.6 4区 物理与天体物理
Bulletin of the Lebedev Physics Institute Pub Date : 2024-08-05 DOI: 10.3103/S1068335624600372
G. A. Gusev, Z. G. Guseva
{"title":"On the Spectrum of Geomagnetic Radio Emission from Extensive Air Showers in a Kinetic Model","authors":"G. A. Gusev,&nbsp;Z. G. Guseva","doi":"10.3103/S1068335624600372","DOIUrl":"10.3103/S1068335624600372","url":null,"abstract":"<p>Geomagnetic radio emission from an extensive atmospheric shower (EAS) is calculated in a kinetic model where, in contrast to previous models, the radiation of each electron and positron of the shower disk is calculated taking into account their spatial distribution in the disk, the disk evolution along the EAS track, energy spectrum and multiple scattering. Radio emission spectra are found at distances of 100 and 800 m from the vertical EAS axis in the frequency range of 40 to 340 MHz with a resolution of 20 MHz.</p>","PeriodicalId":503,"journal":{"name":"Bulletin of the Lebedev Physics Institute","volume":null,"pages":null},"PeriodicalIF":0.6,"publicationDate":"2024-08-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141931462","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
Prediction of the Lock-in Threshold and Nonlinear Distortions of the Scale Factor of a Laser Gyroscope at the Stage of Assembly of a Ring Resonator 环形谐振器组装阶段激光陀螺仪的锁定阈值和比例因子的非线性失真预测
IF 0.6 4区 物理与天体物理
Bulletin of the Lebedev Physics Institute Pub Date : 2024-07-27 DOI: 10.3103/S1068335624600906
E. A. Petrukhin, A. S. Bessonov
{"title":"Prediction of the Lock-in Threshold and Nonlinear Distortions of the Scale Factor of a Laser Gyroscope at the Stage of Assembly of a Ring Resonator","authors":"E. A. Petrukhin,&nbsp;A. S. Bessonov","doi":"10.3103/S1068335624600906","DOIUrl":"10.3103/S1068335624600906","url":null,"abstract":"<p>We report a method for measuring complex coupling coefficients in a ring resonator of a laser gyroscope. It is shown how, using the results of the measurements, to predict the values of the lock-in threshold and nonlinear distortions of the scale factor of a laser gyroscope at the stage of assembly and adjustment of the ring resonator and, in particular, to detect the presence of dust particles in the working areas of the mirrors. The possibilities of using this method to optimize the process of sputtering multilayer mirrors of a laser gyroscope are discussed.</p>","PeriodicalId":503,"journal":{"name":"Bulletin of the Lebedev Physics Institute","volume":null,"pages":null},"PeriodicalIF":0.6,"publicationDate":"2024-07-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141778584","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
A Disc-Shaped Composite Ceramic Active Element with Multipass and Multichannel Pumping 具有多通道和多通道泵送功能的圆盘形复合陶瓷有源元件
IF 0.6 4区 物理与天体物理
Bulletin of the Lebedev Physics Institute Pub Date : 2024-07-27 DOI: 10.3103/S1068335624600918
A. Yu. Kanaev, A. L. Koromyslov, K. V. Prokhorchuk, I. M. Tupitsyn, E. A. Cheshev
{"title":"A Disc-Shaped Composite Ceramic Active Element with Multipass and Multichannel Pumping","authors":"A. Yu. Kanaev,&nbsp;A. L. Koromyslov,&nbsp;K. V. Prokhorchuk,&nbsp;I. M. Tupitsyn,&nbsp;E. A. Cheshev","doi":"10.3103/S1068335624600918","DOIUrl":"10.3103/S1068335624600918","url":null,"abstract":"<p>Disk lasers are a promising configuration that can produce high output power with high spatial quality of radiation due to efficient heat removal from the active region. An important task in the design of disk lasers is to achieve efficient pumping with high gain uniformity across the active region. A new multipass pumping scheme is proposed. The pumping distribution in a Yb:YAG/YAG disk-shaped composite ceramic active element has been numerically simulated and experimentally investigated. It is shown that for such a scheme with 12-channel pumping, the distribution of absorbed pump power with an inhomogeneity of maximum 12.6% can be achieved at a pumping efficiency of 80%.</p>","PeriodicalId":503,"journal":{"name":"Bulletin of the Lebedev Physics Institute","volume":null,"pages":null},"PeriodicalIF":0.6,"publicationDate":"2024-07-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141778579","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
Study of Continuous-Wave Single-Mode Lasing Efficiency in a Longitudinally Pumped YLF:Nd3+ Laser 纵向泵浦 YLF:Nd3+ 激光器中的连续波单模激光效率研究
IF 0.6 4区 物理与天体物理
Bulletin of the Lebedev Physics Institute Pub Date : 2024-07-27 DOI: 10.3103/S1068335624600852
A. Yu. Abazadze
{"title":"Study of Continuous-Wave Single-Mode Lasing Efficiency in a Longitudinally Pumped YLF:Nd3+ Laser","authors":"A. Yu. Abazadze","doi":"10.3103/S1068335624600852","DOIUrl":"10.3103/S1068335624600852","url":null,"abstract":"<p>We report a theoretical and experimental study of the effect of up-conversion on the efficiency of continuous-wave generation of the fundamental TEM<sub>00</sub> mode in a YLF:Nd<sup>3+</sup> laser longitudinally pumped by laser diode radiation. It is shown that up-conversion is not the reason for the dependence of the single-mode output power of a YLF:Nd<sup>3+</sup> laser on the output mirror reflectance at a constant pump power.</p>","PeriodicalId":503,"journal":{"name":"Bulletin of the Lebedev Physics Institute","volume":null,"pages":null},"PeriodicalIF":0.6,"publicationDate":"2024-07-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141778581","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
Yb:YAG Slab Laser Amplifier Yb:YAG 平板激光放大器
IF 0.6 4区 物理与天体物理
Bulletin of the Lebedev Physics Institute Pub Date : 2024-07-27 DOI: 10.3103/S106833562460089X
D. A. Kuzin, A. V. Starobor, I. I. Kuznetsov, O. V. Palashov
{"title":"Yb:YAG Slab Laser Amplifier","authors":"D. A. Kuzin,&nbsp;A. V. Starobor,&nbsp;I. I. Kuznetsov,&nbsp;O. V. Palashov","doi":"10.3103/S106833562460089X","DOIUrl":"10.3103/S106833562460089X","url":null,"abstract":"<p>A laser amplifier based on an active element in the shape of a Yb:YAG slab is developed. It combines the propagation of an amplified elliptical beam without internal reflections, the use of high-brightness diode pump channel combining, and a heat sink made of silicon carbide. Its laser characteristics and factors limiting the output pulse energy are studied. It is shown that the application of an active element with gradient doping ensures stable operation of the laser head at pump powers of ∼0.5 kW. The use of signal radiation diverging along one axis compensates for the effect of reducing the output cross section of the amplified beam; as a result, a gain of <i>G</i> = 4 is ensured with a beam quality factor <i>M</i><sup>2</sup> &lt; 1.4.</p>","PeriodicalId":503,"journal":{"name":"Bulletin of the Lebedev Physics Institute","volume":null,"pages":null},"PeriodicalIF":0.6,"publicationDate":"2024-07-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141778582","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
Analysis of a Device Based on a Multicore Fiber with Tapering Cores for Radiation Summation in Multichannel Laser Systems 分析多通道激光系统中基于带有锥形纤芯的多芯光纤的辐射求和装置
IF 0.6 4区 物理与天体物理
Bulletin of the Lebedev Physics Institute Pub Date : 2024-07-27 DOI: 10.3103/S1068335624600888
Kh. Kh. Kumykov, A. V. Uskov, V. V. Bezotosnyi
{"title":"Analysis of a Device Based on a Multicore Fiber with Tapering Cores for Radiation Summation in Multichannel Laser Systems","authors":"Kh. Kh. Kumykov,&nbsp;A. V. Uskov,&nbsp;V. V. Bezotosnyi","doi":"10.3103/S1068335624600888","DOIUrl":"10.3103/S1068335624600888","url":null,"abstract":"<p>The proposed fiber-optic device is an array of tapering cores in a common cladding. Possible applications of the device for radiation summation in multielement laser systems are discussed. The criterion is specified for the formation of the device parameters to obtain optically independent channels, which makes it possible to produce a narrow radiation beam in the far zone. Analytical expressions are derived for the radiation field in the far zone and the parameters of the device for obtaining a close-to-diffraction divergence. This device allows an unlimited increase in the number of emitters to increase the radiation power in a narrow beam.</p>","PeriodicalId":503,"journal":{"name":"Bulletin of the Lebedev Physics Institute","volume":null,"pages":null},"PeriodicalIF":0.6,"publicationDate":"2024-07-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141778583","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
Diagnostics of First Samples of Chirped Volume Bragg Gratings Inscribed Using Femtosecond Laser Pulses 使用飞秒激光脉冲刻画的啁啾体布拉格光栅首件样品的诊断方法
IF 0.6 4区 物理与天体物理
Bulletin of the Lebedev Physics Institute Pub Date : 2024-07-27 DOI: 10.3103/S106833562460092X
A. I. Gorokhov, E. A. Perevezentsev, I. B. Mukhin, M. R. Volkov
{"title":"Diagnostics of First Samples of Chirped Volume Bragg Gratings Inscribed Using Femtosecond Laser Pulses","authors":"A. I. Gorokhov,&nbsp;E. A. Perevezentsev,&nbsp;I. B. Mukhin,&nbsp;M. R. Volkov","doi":"10.3103/S106833562460092X","DOIUrl":"10.3103/S106833562460092X","url":null,"abstract":"<p>We report a developed methodology for studying the main parameters and identifying the features of chirped volume Bragg gratings (CVBGs). The results of diagnostics of the first fused silica CVBG samples inscribed by femtosecond laser pulses using a phase mask are presented: the linear absorption coefficient, phase and polarization distortions arising during grating inscription, and spectral and dispersion characteristics are studied. The results of the studies indicate the prospects for using gratings of this type in high-average-power laser systems.</p>","PeriodicalId":503,"journal":{"name":"Bulletin of the Lebedev Physics Institute","volume":null,"pages":null},"PeriodicalIF":0.6,"publicationDate":"2024-07-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141785596","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
Single-Frequency Tunable External-Cavity Semiconductor Lasers Emitting at 1550 nm 发射波长为 1550 纳米的单频可调外腔半导体激光器
IF 0.6 4区 物理与天体物理
Bulletin of the Lebedev Physics Institute Pub Date : 2024-07-27 DOI: 10.3103/S1068335624600864
V. P. Duraev, S. A. Voronchenko, S. V. Medvedev, M. R. Lebedev
{"title":"Single-Frequency Tunable External-Cavity Semiconductor Lasers Emitting at 1550 nm","authors":"V. P. Duraev,&nbsp;S. A. Voronchenko,&nbsp;S. V. Medvedev,&nbsp;M. R. Lebedev","doi":"10.3103/S1068335624600864","DOIUrl":"10.3103/S1068335624600864","url":null,"abstract":"<p>We report the results of fabrication works on single-frequency tunable semiconductor laser modules for a wavelength of 1550 nm, with an external cavity being based on fiber Bragg gratings formed in a single-mode fiber. Tuning of the radiation wavelength using a piezoceramic element is considered. The laser modules are capable of generating dynamically stable single-frequency radiation with side mode suppression of more than 40 dB, a lasing line width of 100 kHz, and an output optical power of higher than 50 mW. The wavelength tuning of the emission spectrum of the laser module is 2 nm.</p>","PeriodicalId":503,"journal":{"name":"Bulletin of the Lebedev Physics Institute","volume":null,"pages":null},"PeriodicalIF":0.6,"publicationDate":"2024-07-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141785642","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
High-Power Pulsed, In-Well-Pumped InGaP/AlGaInP Heterostructure, Semiconductor Disk Laser 高功率脉冲、阱内泵浦 InGaP/AlGaInP 异质结构半导体盘式激光器
IF 0.6 4区 物理与天体物理
Bulletin of the Lebedev Physics Institute Pub Date : 2024-07-27 DOI: 10.3103/S1068335624600876
V. I. Kozlovsky, S. M. Zhenishbekov, Ya. K. Skasyrsky, M. P. Frolov
{"title":"High-Power Pulsed, In-Well-Pumped InGaP/AlGaInP Heterostructure, Semiconductor Disk Laser","authors":"V. I. Kozlovsky,&nbsp;S. M. Zhenishbekov,&nbsp;Ya. K. Skasyrsky,&nbsp;M. P. Frolov","doi":"10.3103/S1068335624600876","DOIUrl":"10.3103/S1068335624600876","url":null,"abstract":"<p>We report an investigation of a semiconductor disk laser (SDL) based on an InGaP/AlGaInP heterostructure emitting at a wavelength near 640 nm under in-well pumping by a pulsed rhodamine 6G dye laser with an emission wavelength of 601 nm. Use is made of structures with 25 quantum wells arranged in depth with a period of 193 nm. In a structure with a built-in Bragg mirror, a power of 3.5 W is reached at a wavelength of 642 nm with a slope efficiency of 7% with respect to the absorbed pump power. The achieved second harmonic power at a wavelength of 321 nm is approximately 30% of the maximum SDL power at the fundamental frequency. Under pumping above 250 W, the structure is destroyed due to strong adiabatic heating of the GaAs growth substrate. In a structure with a deposited broadband dielectric mirror, it is possible to reduce the adiabatic heating factor, implement double-pass pumping, and, accordingly, increase the supplied pump power. This makes it possible to obtain a pulse power of higher than 70 W at a wavelength of 645.5 nm with a slope efficiency of over 17%.</p>","PeriodicalId":503,"journal":{"name":"Bulletin of the Lebedev Physics Institute","volume":null,"pages":null},"PeriodicalIF":0.6,"publicationDate":"2024-07-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141778580","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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