Mr. Mikhail I. Skvortsov Profile

Mikhail I. Skvortsov

Software Engineer at Institute of Automation and Electrometry of the SB RAS

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Proceedings Article | 18 April 2021 Presentation + Paper

Seven-core fiber Raman laser with fs-inscribed random structures

Mikhail Skvortsov, Victor Labuntsov, Alexey Wolf, Alexandr Dostovalov, Sergey Babin

Proceedings Volume 11773, 117730H (2021) https://doi.org/10.1117/12.2592527

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We report on the demonstration and characterization of Raman laser generating at the wavelength of ~1090 nm with total output power of up to 5 W based on the 7-core passive fiber with coupled cores. The Raman gain in all cores is provided by the pump laser connected to the FBG-free central core, whereas the laser cavity is formed by two sets of highly-reflective fiber Bragg gratings (FBGs) inscribed by fs pulses in all peripherical cores at the both ends of the 7-core fiber. The output FBG set has got a random shift along the axis between individual FBGs thus forming a random array of FBGs. Along with the Stokes line narrowing reasoned by the reduction of spectral broadening via nonlinear effects due to the enlargement of effective mode area in the multicore fiber with coupled cores in comparison with a standard singlemode fiber Raman laser, the additional line narrowing effect induced by the multicore random FBG array has been also revealed. It results in the generation of single peak of <30 pm linewidth near the threshold, whereas the linewidth broadens to ~250 pm at maximum power. At that, the single peak generation at low powers is not stable in time converting at some moments to multiple 20- pm peaks with random spacing and amplitudes defined by the interference of beams reflected from individual output FBGs with random longitudinal shifts. The ways to stabilize the generated spectrum are discussed.

Proceedings Article | 11 April 2019 Paper

Tm-doped fiber laser with control of spectral dynamics

A. Budarnykh, A. Vladimirskaya, M. Skvortsov, A. Wolf, I. Lobach, S. Kablukov

Proceedings Volume 11028, 110282T (2019) https://doi.org/10.1117/12.2522437

KEYWORDS: Fiber lasers, Ion beam finishing, Heterodyning, Beam controllers, Absorption, Mirrors, Tunable lasers, Polarization, Sensors, Pulsed laser operation

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Self-sweeping of laser frequency is relatively new effect in fiber lasers. The effect consists in periodic dynamics of the laser frequency without use of tuning elements and electrical drivers for frequency tuning. Owing to broad sweeping range (up to 23 nm) and simplicity, self-sweeping fiber lasers are attractive sources for applications demanding tunable radiation. Currently the self-sweeping effect in fiber lasers was observed in different spectral regions covering range from 1 to 2.1 μm. However, it is difficult to control spectral dynamics due to self-induced nature of the sweeping effect. In the paper, we demonstrated linearly-polarized Tm-doped fiber laser with lasing near 1.9 μm with manually controlled the spectral dynamics with pump power adjustment. The laser operates in three self-sweeping regimes depending on pump power: 1) with normal scanning direction at high rate (~5 nm/sec) and, 2) with reverse one at low sweeping rate (~0.1 nm/sec) and 3) wavelength stopping. In the case of wavelength stopping, the wavelength can be stopped at arbitrary value in the range from 1912 to 1923 nm depending on prehistory of spectral dynamics of the laser. The wavelength stability in case of wavelength stopping is better than 50 pm within 5 minutes. In the case of linear scanning of laser line, sweeping range exceeds 15 nm.

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