Single-mode 3kW ytterbium fiber amplifier with diffraction-limited divergence in all-fiber format and compact modular package

Platonov, N.S.; Yagodkin, Roman; Cruz, Joel De La; Gapontsev, Valentin

doi:10.1117/12.2578845

Cited by 4 publications

(2 citation statements)

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“…Recently the output powers of 5kW with output beam quality M 2 =1.6 and 6kW with M 2 =2.0 have been reached in narrow-linewidth Yb fiber amplifier in all-fiber format configuration with bi-directional tandem pumping [3]. The output powers achieved in all-fiber format amplifiers with direct diode pumping are 3kW with output beam quality M 2 =1.7 [4], 3kW with M 2 <1.1 [5] and 4kW with M 2 =1.33 [6]. The maximum output powers of narrow-linewidth fiber amplifiers are limited mainly by non-linear Stimulated Brillouin Scattering (SBS), Stimulated Raman Scattering (SRS) and Mode Instability (MI) effects [7][8][9][10][11][12][13].…”

Section: Introductionmentioning

confidence: 99%

4kW single-mode narrow-linewidth Ytterbium fiber amplifier in all-fiber format and modular package

Platonov¹,

Yagodkin²,

Cruz³

et al. 2023

Fiber Lasers XX: Technology and Systems

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We report 4kW Single-Mode narrow-linewidth Ytterbium fiber amplifier in all-fiber format and modular package with diffraction-limited beam divergence for the amplification of narrow linewidth seed signals. Measured M 2 values of output beam throughout full power range are ≤ 1.1. The fiber amplifier has been pumped by laser diodes directly and has 3m output delivery cable terminated with IPG connector. The amplifier module has ≥ 38% electro-optical efficiency. The fiber amplifier operates up to 4kW with depolarized seed signals without onset of SBS and/or MI. We observed the broadening of amplified signal at high powers when depolarizing of the narrow-linewidth seed signal was produced with a classic Lyot scheme on PM Panda fibers. This broadening resulted in dropping of in-band power below 99% at output powers >3.3kW. Negligible broadening at FWHM level of amplified signal have been observed with other type of fiber depolarizer based on single PM Panda fiber scheme. The Yb fiber amplifier with this type of depolarizing of seed signal operates up to 4kW with in-band power ≥ 99% at 60GHz linewidth of the seed source.

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Section: Introductionmentioning

confidence: 99%

4kW single-mode narrow-linewidth Ytterbium fiber amplifier in all-fiber format and modular package

Platonov¹,

Yagodkin²,

Cruz³

et al. 2023

Fiber Lasers XX: Technology and Systems

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show abstract

“…Currently, there is significant interest in continuous fiber lasers of several kW [1][2][3][4][5][6], which has not weakened in recent years [7][8][9]. This is due to the increasingly expanding fields of practical application of lasers of this power range, including fundamental science, industrial material processing, and medicine.…”

Section: Introductionmentioning

confidence: 99%

All-Glass Single-Mode Leakage Channel Microstructured Optical Fibers with Large Mode Area and Low Bending Loss

et al. 2023

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The paper presents the results of theoretical and experimental studies of all-glass leakage channel microstructured optical fibers (MOFs) with a large mode area and low bending losses. These MOFs contain two layers of fluorine-doped silica glass elements with a reduced refractive index, different diameters, and different distances between them. A numerical analysis of the properties of these MOFs was performed using the finite element method. The leakage losses for the fundamental and higher-order modes were calculated in the spectral range from 0.65 μm to 1.65 μm. Simulation results show that the proposed MOF design allows for single-mode guidance in the spectral range from 0.92 μm to 1.21 μm with a bending radius of down to 0.08 m. The measured losses of the fabricated MOF with a core diameter of 22.5 μm and a bending radius of 0.1 m were less than 0.1 dB/m in the spectral range from 0.9 μm to 1.5 μm. It is demonstrated that the segments of this MOF longer than 5 m are single-mode.

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Low-nonlinearity optical fibers and their applications

Dragic,

Ballato,

Hawkins

2024

Specialty Optical Fibers

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Single-mode 3kW ytterbium fiber amplifier with diffraction-limited divergence in all-fiber format and compact modular package

Cited by 4 publications

References 0 publications

4kW single-mode narrow-linewidth Ytterbium fiber amplifier in all-fiber format and modular package

4kW single-mode narrow-linewidth Ytterbium fiber amplifier in all-fiber format and modular package

All-Glass Single-Mode Leakage Channel Microstructured Optical Fibers with Large Mode Area and Low Bending Loss

Low-nonlinearity optical fibers and their applications

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