TY - JOUR

T1 - Pulsed Raman Lasing in Diode-Pumped Multimode Graded-Index Fiber with Tuned Femtosecond-Laser-Inscribed Bragg Grating

AU - Kuznetsov, Alexey G.

AU - Terentyev, Vadim S.

AU - Dostovalov, Alexander V.

AU - Nemov, Ilya N.

AU - Babin, Sergey A.

N1 - Kuznetsov, A.G.; Terentyev, V.S.; Dostovalov, A.V.; Nemov, I.N.; Babin, S.A. Pulsed Raman Lasing in Diode-Pumped Multimode Graded-Index Fiber with Tuned Femtosecond-Laser-Inscribed Bragg Grating. Micromachines 2025, 16, 1315. https://doi.org/10.3390/mi16121315 This research was funded by the Russian Science Foundation, grant number 21-72-30024-П.

PY - 2025/11/24

Y1 - 2025/11/24

N2 - Raman lasers based on multimode graded-index (GRIN) fibers directly pumped by laser diodes are the object of intensive research, promising to produce high-power, high-quality beams at new wavelengths. In this paper, we demonstrate a pulsed operation of such a laser based on a 1 km 100/140 GRIN fiber in which a resonator is formed by a pair of FBGs: a high-reflective broadband input FBG and a tunable narrowband output FBG inscribed by fs laser pulses in the fundamental mode area of the core. In addition to beam quality improvement, the output FBG modulated by a piezoelectric nanopositioner with a frequency of 20–180 Hz generates laser pulses with a duration of 23–1.2 ms, respectively. The maximum power reached is 22 watts, and the signal spectrum widens significantly with increased pumping (>2 nm from the central wavelength of 976 nm). The pulse generation method used in this work introduces wavelength chirp in the individual pulse, which can be used in sensing and other applications.

AB - Raman lasers based on multimode graded-index (GRIN) fibers directly pumped by laser diodes are the object of intensive research, promising to produce high-power, high-quality beams at new wavelengths. In this paper, we demonstrate a pulsed operation of such a laser based on a 1 km 100/140 GRIN fiber in which a resonator is formed by a pair of FBGs: a high-reflective broadband input FBG and a tunable narrowband output FBG inscribed by fs laser pulses in the fundamental mode area of the core. In addition to beam quality improvement, the output FBG modulated by a piezoelectric nanopositioner with a frequency of 20–180 Hz generates laser pulses with a duration of 23–1.2 ms, respectively. The maximum power reached is 22 watts, and the signal spectrum widens significantly with increased pumping (>2 nm from the central wavelength of 976 nm). The pulse generation method used in this work introduces wavelength chirp in the individual pulse, which can be used in sensing and other applications.

KW - Raman laser

KW - graded index fiber

KW - tunable FBG

KW - multimode fiber

UR - https://www.scopus.com/pages/publications/105026346138

M3 - Article

VL - 16

JO - Micromachines

JF - Micromachines

SN - 2072-666X

IS - 12

M1 - 1315

ER -