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Single-frequency continuous-wave laser based on the novel Er/Yb-doped composite phosphosilicate fiber
Optics and Laser Technology. 2022. Vol. 151. Article 108049.
Optical and laser properties of a new Er/Yb-doped composite optical fiber manufactured according to the “rodin-
tube” technique are presented. The fabricated composite fiber with a standard outer diameter of 125 μm was
single-mode at the wavelength of 1.55 μm. A Fabry-Perot laser cavity was manufactured on a 25 mm long fiber
segment using the femtosecond technique of Bragg gratings inscription. The resulting laser with an effective
cavity length of 12 mm generated strictly continuouswave single-frequency radiation at a wavelength of 1548.3
nm at room temperature (295 K). The key advantage of the studied Er/Yb-doped composite fiber laser is the
excellent temporal stability of the laser output without any tendency for self-excited oscillation mode at any
pump level.
Dmitriev A., Kornilov V., Batienkov R., Lecture Notes in Civil Engineering 2026 Vol. 886 P. 249–255
Numerous studies have provided compelling evidence that the probability distribution of avalanche sizes follows a power law, and that 1/f noise is present in the stochastic dynamics of landslides. We present a theoretical explanation of these phenomena within the framework of self-organized criticality theory, proposing a discrete-time model in the form of a sandpile cellular ...
Added: October 13, 2026
Dmitriev A., Shulman I., Lebedev A., Studies in Computational Intelligence 2026 Vol. 1265 P. 266–273
A discrete-time model is presented for the self-organization of the X/Twitter social network to the edge of a phase transition, characterized by avalanche-like propagation of information in the network. The model is based on the analogy between the critical dynamics of the X social network and sandpile cellular automata with Manna rule on the Chung-Lu ...
Added: October 13, 2026
Arutyunov K., Kharitonov I. A., Petrosyants K. O., JETP Letters 2026 Vol. 124 No. 6 P. 1–16
Superconducting properties of metallic micro- and nanowires can be entirely different from those of bulk superconductors. Of particular interest is the nonequilibrium current-induced state of a quasi-one-dimensional superconducting channel. The most interesting phenomenon here is the stepped I–V characteristic, explained by a process known as phase slip center activation. If the origin of such step-like ...
Added: October 13, 2026
Makarov D. M., Kalikin N., Fashchevsky K. A. et al., Electrochimica Acta 2026 Vol. 579 Article 150159
Machine learning (ML) has become a powerful tool for accelerating the development of carbon-based supercapacitors;
however, most published models assume that a single predictive framework can describe both conventional
porous carbons and hybrid carbon electrodes. Here, we test this assumption using a comprehensive
benchmark dataset and an extended literature-curated dataset enriched with synthesis- and electrolyte-related
descriptors. Three ML algorithms ...
Added: October 13, 2026
Махлуф М., Ozhegov R., Elezov M. et al., Фотоника 2026 Vol. 20 No. 6 P. 414–423
This paper compares the ranging precision of direct time-of-flight (dToF) and non-line-of-sight (NLOS) LiDAR architectures, both using a superconducting nanowire single-photon detector (SNSPD). Both systems operate at 1550 nm with a 50 ps pulsed laser and time-correlated single-photon counting (TCSPC). The dToF configuration achieved approximately 100 µm precision at 10 m, while the NLOS configuration achieved 500 µm precision for ...
Added: October 12, 2026
Singapore: Springer, 2026.
This volume presents the Proceedings of the 34th IUPAP Conference on Computational Physics (CCP2023), held in Kobe, Japan on August 4–8, 2023. It offers a collection of peer-reviewed articles that highlight recent developments in computational and simulation research across various areas of physics. Key topics include the use of data science, quantum computing, and machine ...
Added: October 12, 2026
Goncharov A., Chibisov A., Advanced Theory and Simulations 2023 Vol. 12 No. 13 Article 2200816
Designing stable quantum computers with the ability to correct errors responsibly requires a detailed understanding of the physical processes that underlie these devices. In this study, detailed quantum mechanical simulations of the atomic structure, charge distribution of electron density, and distribution and orientation of magnetic and quantum states as a function of applied external pressure ...
Added: October 11, 2026
Popov S. M., O. V. Butov, Bazakutsa A. P. et al., Results in Physics 2020 Vol. 16 Article 102868
We report on random lasing observed with 5-m-long Er-doped fiber comprising an array of weak fiber Bragg gratings (FBGs) inscribed in the fiber core and uniformly distributed over the whole fiber length. The laser design ensures domination of dynamical population inversion grating over the FBGs in total distributed feedback enabling laser stabilization and nonlinear laser ...
Added: October 21, 2022
Dolzhenko E., Tomyshev K., Oleg V. Butov, Physica Status Solidi - Rapid Research Letters 2020 Vol. 14 No. 12 Article 2000435
A new technique of depositing a poly(vinyl alcohol) (PVA) coating with an airbrush on the cylindrical surface of an optical fiber with real-time spectral monitoring is presented. The method is applied for creating hygroscopic PVA coating as a part of the tilted-fiber Bragg-grating (TFBG)-assisted fiber hygrometer samples. By monitoring the transmission spectra of the samples ...
Added: October 21, 2022
Oleg V. Butov, Przhiialkovskii D., Results in Physics 2021 Vol. 30 Article 104902
The paper presents a novel multi-pass point-by-point method for high-precision inscription of fiber Bragg gratings
with a femtosecond laser radiation. The dynamics of the gratings formation is demonstrated in comparison
with the classical method of UV-radiation inscription. It is shown that due to the feasibility of the inscription
dynamics control, it is possible to fabricate high-precision Bragg gratings ...
Added: October 21, 2022
Попов С. М., Butov O., Колосовский А. О. et al., Квантовая электроника 2021 Т. 51 № 12 С. 1101–1106
We report the latest results on inscribing extended fibre Bragg grating (FBG) arrays upon fibre drawing, obtained at the Kotelnikov Institute of Radioengineering and Electronics of RAS. The properties of these structures are considered, and examples of their application in sensor systems of microwave dense wavelength multiplexing and as a basis for designing single-frequency fibre ...
Added: October 21, 2022
Tomyshev K. A., Dolzhenko E. I., O. V. Butov, Quantum Electronics 2021 Vol. 51 No. 12 P. 1113–1117
We report the results of studying the influence of fibre diameter on the accuracy and resolution of fibre refractive index sensors based on tilted Bragg gratings – a key element used to develop high-precision fibre sensors for environmental monitoring. A comparative study is performed using one of universal processing algorithms based on spectral envelope analysis. ...
Added: October 21, 2022
Нечепуренко И. А., ACS Photonics 2018 Vol. 5 No. 12 P. 5038–5046
A pulsed regime of short-cavity, heavily erbium-doped fiber lasers is of high interest for its possible applications in telecommunications and sensorics. Here, we demonstrate and compare these lasers in two configurations, a distributed feedback laser and a classic Fabry–Perot-type laser. We have managed to create lasers that function stably with cavities as small as 50 ...
Added: February 7, 2019
Ogorodnikov L.L., S.S. Vergeles, Optics Letters 2018 Vol. 43 No. 4 P. 651–654
We study the output emission statistics of a random continuous-wave Raman fiber laser. The signal evolution is governed by a generalized nonlinear Schrödinger equation (NLSE) with inserted gain. The statistics are close to the Rayleigh one, and the deviations are caused by the Kerr nonlinearity. To characterize the deviations, we analytically find the mean of ...
Added: February 8, 2018
Churkin D. V., I.V. Kolokolov, Podivilov E. V. et al., Nature Communications 2015 Vol. 2 P. 6214
Traditional wave kinetics describes the slow evolution of systems with many degrees of freedom to equilibrium via numerous weak non-linear interactions and fails for very important class of dissipative (active) optical systems with cyclic gain and losses, such as lasers with non-linear intracavity dynamics. Here we introduce a conceptually new class of cyclic wave systems, ...
Added: October 15, 2016
I.V.Kolokolov, V.V.Lebedev, Podivilov E. V. et al., Journal of Experimental and Theoretical Physics 2014 Vol. 146 No. 6(12) P. 1295–1300
We develop the theory explaining the role of nonlinearity in generation radiation in a fiber laser that is pumped by external light. The pumping energy is converted into the generating signal due to the Raman scattering supplying an effective gain for the signal. The signal is generated with frequencies near the one corresponding to the ...
Added: October 15, 2016