Up to 2.5-kW on non-PM fiber and 2.0-kW linear polarized on PM fiber narrow linewidth CW diffraction-limited fiber amplifiers in all-fiber format

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

doi:10.1117/12.2291100

Cited by 30 publications

(17 citation statements)

References 8 publications

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“…High-power narrow-linewidth fiber lasers with excellent beam quality have been highly desired for spectral and coherent beam combinations [1][2][3]. The power scaling of single-mode narrow-linewidth fiber lasers has been under intense investigations [4][5][6][7][8][9][10][11][12][13][14][15]. This mainly involves comprehensive suppressions of the transverse mode instabilities (TMI) and nonlinear inelastic scattering effects, such as stimulated Brillouin scattering (SBS) and stimulated Raman scattering (SRS) [16][17][18].…”

Section: Introductionmentioning

confidence: 99%

“…It should be noted that those two fiber laser systems are established in free-space structure, which is not suitable for compact assembling and maintenance. Therefore, most of the reported all-fiberized narrow-linewidth fiber amplifiers are based on conventional active fiber and require comprehensive optimization of structure and parameters of the fiber amplifiers [7][8][9][10][11][12][13][14][15]. As for all-fiberized format, 3.7 kW output power had been achieved with near diffraction limited beam quality and spectral linewidth of ~ 0.3 nm [15].…”

Section: Introductionmentioning

confidence: 99%

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All-fiberized and narrow-linewidth 5 kW power-level fiber amplifier based on a bidirectional pumping configuration

Liu

et al. 2021

High Pow Laser Sci Eng

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In this paper, an all-fiberized and narrow-linewidth 5 kW power-level fiber amplifier is presented. The laser is achieved based on the master oscillator power amplification (MOPA) configuration, in which the phase-modulated single-frequency laser is applied as the seed laser and bidirectional pumping configuration is applied in the power amplifier. The stimulated Brillouin scattering (SBS), stimulated Raman scattering (SRS), and transverse mode instability (TMI) effects are all effectively suppressed in the experiment. Consequently, the output power is scaled up to 4.92 kW with a slope efficiency of as high as ~ 80%. The 3 dB spectral width is about 0.59 nm, and the beam quality is measured to be M 2 ~ 1.22 at maximum output power. Furthermore, we have also conducted detail spectral analysis on the spectral width of the signal laser, which reveals that the spectral wing broadening phenomenon could lead to the obvious decrease of the spectral purity at certain output power. Overall, this work could provide a well reference for obtaining and optimizing high-power narrow-linewidth fiber lasers.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

All-fiberized and narrow-linewidth 5 kW power-level fiber amplifier based on a bidirectional pumping configuration

Liu

et al. 2021

High Pow Laser Sci Eng

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“…By now, the output power of all-fiber narrow-linewidth non-PM fiber laser has achieved 3.7 kW with a linewidth of 79 GHz [21]. However, obtaining of a high power PM-fiber laser output is more challenging compared with the non-PM fiber laser because of the lower SBS and MI threshold [20], [26]. The Table 1 shows the typical experimental results on narrow linewidth linearly polarized all-fiber amplifiers in recent years.…”

Section: Introductionmentioning

confidence: 99%

“…In 2017, R. Su et al obtained a 2.43 kW output laser power with 68 GHz linewidth based on WNS phase modulation [33]. In 2018, N. Platonov reported 2 kW, 22 GHz linearly polarized all-fiber laser [26], the further increasing of laser power is limited by the MI effect. In 2019 [38], we reported a 1.5 kW PM fiber amplifier with 13 GHz linewidth and near diffraction-limited beam quality based on WNS phase modulation.…”

Section: Introductionmentioning

confidence: 99%

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2.5 kW Narrow Linewidth Linearly Polarized All-Fiber MOPA With Cascaded Phase-Modulation to Suppress SBS Induced Self-Pulsing

Feng

Chang

et al. 2020

IEEE Photonics J.

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As a major limitation for power scaling of high power narrow linewidth fiber master oscillator power amplifiers (MOPAs), Stimulated Brillouin Scattering (SBS) induced selfpulsing in polarization maintaining (PM) fiber amplifiers is well characterized and analyzed in this paper by comparing different white noise signal (WNS) phase-modulated modes in experiments. It is found that the self-pulsing effect is not observed in the PM-amplifier with single-frequency laser seed injection, and cascaded WNS modulation provides superior self-pulsing suppression than single WNS modulation with similar output linewidth. Moreover, the experimental results indicate that the self-pulsing threshold can hardly be predicted only by the output linewidth or the defined SBS threshold in a WNS phase modulated fiber amplifier system. As self-pulsing is originated from the spectral spikes in WNS modulated system, we theoretically analyzed characteristics of these spikes in different phase-modulation modes. It indicates the spectral peak intensity can be reduced by cascaded modulation, for which self-pulsing can be suppressed. The theoretical predictions agree well with the experimental results. At the same time, in order to suppress the mode instability effect, a plum blossom shaped bending mode selection device is used in this high-power narrow linewidth fiber amplifier system. Finally, a 32 GHz cascaded WNSs modulated, over than 2.5 kW linearly polarized all-fiber amplifier with a slope efficiency of 86.7% is demonstrated. The polarization extinction ratio (PER) is measured larger than 14 dB and the beam quality factor M 2 maintains lower than 1.3 in the power scaling process.

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Study of high power CBC fiber laser systems with non-equal splitting ratio beam-splitters

Yan

Tao

et al. 2023

Results in Optics

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Up to 2.5-kW on non-PM fiber and 2.0-kW linear polarized on PM fiber narrow linewidth CW diffraction-limited fiber amplifiers in all-fiber format

Cited by 30 publications

References 8 publications

All-fiberized and narrow-linewidth 5 kW power-level fiber amplifier based on a bidirectional pumping configuration

All-fiberized and narrow-linewidth 5 kW power-level fiber amplifier based on a bidirectional pumping configuration

2.5 kW Narrow Linewidth Linearly Polarized All-Fiber MOPA With Cascaded Phase-Modulation to Suppress SBS Induced Self-Pulsing

Study of high power CBC fiber laser systems with non-equal splitting ratio beam-splitters

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