Q-Switched Pulse Generation in a Multicore Fiber Laser with a Femtosecond-Laser-Inscribed FBG Array

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Q-Switched Pulse Generation in a Multicore Fiber Laser with a Femtosecond-Laser-Inscribed FBG Array. / Kuznetsov, Alexey G.; Dostovalov, Alexander V.; Babin, Sergey A.

In: Photonics, Vol. 13, No. 7, 612, 25.06.2026.

Research output: Contribution to journal › Article › peer-review

BibTeX

@article{8e13a25abb0146b88cb6de19378ac68f,

title = "Q-Switched Pulse Generation in a Multicore Fiber Laser with a Femtosecond-Laser-Inscribed FBG Array",

abstract = "A Q-switched pulsed laser based on a coupled 7-core Yb-doped fiber with a cavity based on a fiber Bragg grating array has been demonstrated with a maximum energy of microsecond pulses up to 15 μJ at a 1 kHz repetition rate. The lasing spectrum is hybridized so that the laser line maxima of each core are nearly the same, having a negligible spread relative to each other, which is much lower than the wavelength shifts between individual FBGs in the cores. At the same time, the generated power is nearly the same in all the cores. However, when increasing the power beyond the stimulated Raman scattering threshold, the supermodes are destroyed so that the spectra in the cores become increasingly different and less stable, and the output power is mainly concentrated in one of the cores, whereas the pulse shortens significantly to a sub-microsecond duration (300 ns), with damped oscillations appearing at the beginning. The new regimes we demonstrated of the multicore fiber laser are promising for creating powerful pulsed radiation sources with a narrow spectrum.",

keywords = "LD pumping, Q-switch, Raman scattering, beam shape, fs laser inscription, multicore fiber, фемтосекундная лазерная запись, многожильный волоконный лазер, рамановское рассеяние, модуляция добротности, лазерная накачка, форма пучка",

author = "Kuznetsov, {Alexey G.} and Dostovalov, {Alexander V.} and Babin, {Sergey A.}",

note = "Kuznetsov, A.G.; Dostovalov, A.V.; Babin, S.A. Q-Switched Pulse Generation in a Multicore Fiber Laser with a Femtosecond-Laser-Inscribed FBG Array. Photonics 2026, 13, 612. https://doi.org/10.3390/photonics13070612 This research was funded by Russian Science Foundation (grant number 21-72-30024-Π).",

year = "2026",

month = jun,

day = "25",

doi = "10.3390/photonics13070612",

language = "English",

volume = "13",

journal = "Photonics",

issn = "2304-6732",

publisher = "Multidisciplinary Digital Publishing Institute (MDPI)",

number = "7",

}

RIS

TY - JOUR

T1 - Q-Switched Pulse Generation in a Multicore Fiber Laser with a Femtosecond-Laser-Inscribed FBG Array

AU - Kuznetsov, Alexey G.

AU - Dostovalov, Alexander V.

AU - Babin, Sergey A.

N1 - Kuznetsov, A.G.; Dostovalov, A.V.; Babin, S.A. Q-Switched Pulse Generation in a Multicore Fiber Laser with a Femtosecond-Laser-Inscribed FBG Array. Photonics 2026, 13, 612. https://doi.org/10.3390/photonics13070612 This research was funded by Russian Science Foundation (grant number 21-72-30024-Π).

PY - 2026/6/25

Y1 - 2026/6/25

N2 - A Q-switched pulsed laser based on a coupled 7-core Yb-doped fiber with a cavity based on a fiber Bragg grating array has been demonstrated with a maximum energy of microsecond pulses up to 15 μJ at a 1 kHz repetition rate. The lasing spectrum is hybridized so that the laser line maxima of each core are nearly the same, having a negligible spread relative to each other, which is much lower than the wavelength shifts between individual FBGs in the cores. At the same time, the generated power is nearly the same in all the cores. However, when increasing the power beyond the stimulated Raman scattering threshold, the supermodes are destroyed so that the spectra in the cores become increasingly different and less stable, and the output power is mainly concentrated in one of the cores, whereas the pulse shortens significantly to a sub-microsecond duration (300 ns), with damped oscillations appearing at the beginning. The new regimes we demonstrated of the multicore fiber laser are promising for creating powerful pulsed radiation sources with a narrow spectrum.

AB - A Q-switched pulsed laser based on a coupled 7-core Yb-doped fiber with a cavity based on a fiber Bragg grating array has been demonstrated with a maximum energy of microsecond pulses up to 15 μJ at a 1 kHz repetition rate. The lasing spectrum is hybridized so that the laser line maxima of each core are nearly the same, having a negligible spread relative to each other, which is much lower than the wavelength shifts between individual FBGs in the cores. At the same time, the generated power is nearly the same in all the cores. However, when increasing the power beyond the stimulated Raman scattering threshold, the supermodes are destroyed so that the spectra in the cores become increasingly different and less stable, and the output power is mainly concentrated in one of the cores, whereas the pulse shortens significantly to a sub-microsecond duration (300 ns), with damped oscillations appearing at the beginning. The new regimes we demonstrated of the multicore fiber laser are promising for creating powerful pulsed radiation sources with a narrow spectrum.

KW - LD pumping

KW - Q-switch

KW - Raman scattering

KW - beam shape

KW - fs laser inscription

KW - multicore fiber

KW - фемтосекундная лазерная запись

KW - многожильный волоконный лазер

KW - рамановское рассеяние

KW - модуляция добротности

KW - лазерная накачка

KW - форма пучка

UR - https://www.mendeley.com/catalogue/e9726522-2694-323c-a4fe-e0d9512cdca9/

UR - https://www.scopus.com/pages/publications/105045968964

U2 - 10.3390/photonics13070612

DO - 10.3390/photonics13070612

M3 - Article

VL - 13

JO - Photonics

JF - Photonics

SN - 2304-6732

IS - 7

M1 - 612

ER -

ID: 83431710