Experiment-based model of an Er/Yb gain medium for fiber amplifiers and lasers

Vysokikh D.; Bazakutsa A.; Dorofeenko A.; Oleg V. Butov

doi:10.1364/JOSAB.497167

Publications

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Experiment-based model of an Er/Yb gain medium for fiber amplifiers and lasers

Journal of the Optical Society of America B: Optical Physics. 2023. Vol. 40. No. 9. P. 2273–2279.

Vysokikh D., Bazakutsa A., Dorofeenko A., Oleg V. Butov

A model of an Er3+/Yb3+ co-doped glass gain medium is proposed. The system of rate equations taking into
account a minimum set of processes required to describe experimental data was built. As a result, a moderate number of fitting parameters is used, and thereby the model reliability is increased. For the populations of the energy
levels of Er3+ and Yb3+ ions, analytic expressions were obtained, as well as for the gain factor of the medium. The
model was validated by a series of measurements of gain in Er3+/Yb3+ fiber amplifiers of different lengths at varying
pump power. Such parameters of the model were found to fit the experimental data with an account of the spatial
inhomogeneity of thepumppower along the fiber. Themaximuminversion of erbium ion population at highpump
powers was analytically expressed, which describes the “bottleneck” effect. The power required to pump the fiber
along the entire length was found.

Research target: Physics

Keywords: fiber lasers

Sandpile Cellular Automata with Manna Rule on the Chung-Lu Graph: Application to X Social Network

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

Sandpile Cellular Automata with Manna Rule on the Chung-Lu Graph: Application to X Social Network

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

Неравновесное состояние в квазиодномерных сверхпроводящих каналах

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

When universal machine learning models fail in capacitance prediction for carbon-based supercapacitors: Leakage-aware validation and electrolyte screening

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

Ranging Precision Comparison of Direct and Non-Line-of-Sight LiDAR Systems Based on SNSPD

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

Proceedings of the 34th IUPAP Conference on Computational Physics: CCP2023, August 4-8, Kobe, Japan

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

Effect of External Pressure and Quantum State on the Local Magnetization of Germanium Layers: Ab Initio Calculation.

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

Quantum-mechanical study of the optimal phosphorus atoms arrangement on silicene.

Chibisov A., Gnidenko A., Chibisova M. et al., FlatChem 2023 Vol. 41 Article 100533

Manufacturing precise quantum computers with small errors in quantum operations, long coherence times, and low power consumption is the most important challenge in modern nanoelectronics. To understand the operating modes of such calculators in detail, both the optimal arrangement of the qubit system within the structure and changes in its magnetic properties must be comprehensively ...

Added: October 11, 2026

Continuous-wave operation of an erbium-doped short-cavity composite fiber laser

Rybaltovsky A. A., O. V. Butov, Vasiliev S. A. et al., Results in Physics 2020 Vol. 16 Article 102832

In the paper we investigate the characteristics of a short-cavity fiber laser based on a new silica fiber with a composite erbium-doped phosphosilicate core without additional co-doping with ytterbium. For the first time, the operation of such laser in the continuous-wave lasing mode with 1490-nm pump is shown. The laser operation in the self-Q-switching mode, ...

Added: October 21, 2022

Photosensitive highly Er/Yb co-doped phosphosilicate optical fibers for continuous-wave single-frequency fiber laser applications

Rybaltovsky A. A., Lipatov D. S., Lobanov A. S. et al., Journal of the Optical Society of America B: Optical Physics 2020 Vol. 37 No. 10 P. 3077–3083

Highly Er/Yb co-doped phosphosilicate fibers with lowoptical losseswere fabricated by theMCVDmethod, utilizing an all-gas-phase deposition technique developed “in house.” Important characteristics such as photodarkening and photosensitivity of these fibers were thoroughly investigated. An almost negligible impact of photodarkeninginduced losses (no more than 1 dB/m) was discovered in the near-infrared spectral region. The photosensitivity of hydrogen-loaded ...

Added: October 21, 2022

Photobleaching of UV-induced defects in Er/Al-doped glasses for fiber lasers

Bazakutsa A. P., Rybaltovsky A. A., Umnikov A. A. et al., Optical Materials Express 2020 Vol. 10 No. 10 P. 2669–2678

This work contains a study of the mechanisms of emerging and dissociation of UV-induced defects responsible for the degradation of the gain in Er- and Al- codoped silica glass. We investigate absorption spectra changes at the visible and ultraviolet range under UV irradiation at 193 nm and show the role of molecular hydrogen in this ...

Added: October 21, 2022

Оптические волокна с массивом волоконных брэгговских решеток для сенсорных систем и случайных лазеров

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