Kilowatt-Level PM Amplifiers for Beam Combining

Edgecumbe, J.; Bjork, David A.; Galipeau, Joshua; Boivin, Gary; Christensen, S.; Samson, Bryce; Tankala, K.

doi:10.1364/fio.2008.ftuj2

Cited by 8 publications

(5 citation statements)

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“…The Table 1 shows the typical experimental results on narrow linewidth linearly polarized all-fiber amplifiers in recent years. In 2008, Nufern company achieve a kilowatt linearly polarized laser output with a linewidth less than 10 GHz based on 25/400 μm LMA PM gain fiber and WNS phase modulation [27]. In 2010, G. Goodno et al reported a 1.43 kW linearly polarized laser based on active polarization control of a non-PM fiber amplifier, the linewidth is 25 GHz [28].…”

Section: Introductionmentioning

confidence: 99%

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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Section: Introductionmentioning

confidence: 99%

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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“…However, stimulated Brillouin scattering (SBS) [7] and mode instability (MI) [8] effects will limit the power scaling of PM narrow linewidth single mode fiber laser. In the last few years, researchers made great progress on power scaling of narrow linewidth PM fiber lasers [9][10][11][12][13][14][15][16][17][18][19]. In 2008, Nufern Company achieved a kilowatt PM fiber laser output with a linewidth less than 10GHz [9].…”

Section: Introductionmentioning

confidence: 99%

“…In the last few years, researchers made great progress on power scaling of narrow linewidth PM fiber lasers [9][10][11][12][13][14][15][16][17][18][19]. In 2008, Nufern Company achieved a kilowatt PM fiber laser output with a linewidth less than 10GHz [9]. In 2016, P. Ma obtained a 1.89kW PM fiber laser based on three-level sinusoidal phase modulation and PM fiber amplifier with the linewidth of 45GHz [11].…”

Section: Introductionmentioning

confidence: 99%

3 kW polarization maintained fiber lasers with 10.6 GHz linewidth and near diffraction limited beam quality

Chu

Shu

Guo

et al. 2023

Advanced Fiber Laser Conference (AFL2022)

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In this work, a high power polarization maintained fiber laser with ultra-narrow linewidth and near diffraction limited beam quality is demonstrated. The stimulated Brillouin scattering is mitigated by optimizing phase modulation scheme, the mode instability is suppressed by coiling the active fiber, and the output power reaches to 3kW at the full width at halfmaximum linewidth of 10.6GHz. At maximum output power, the stimulated Raman scattering suppression ratio reaches to 75dB, the polarization extinction ratio is 96%, the beam quality M 2 is 1.156, and the further scaling of output power is limited by stimulated Brillouin scattering effect. To the best of our knowledge, this is the highest power for polarization maintained fiber laser with about 10GHz linewidth ever reported so far.

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“…Specially designed spectral broadening formats have been proposed to achieve highpower PM lasers with 10 GHz linewidth, including pseudo-random binary sequence (PRBS) [5][6][7], filtered white noise signal (WNS) [8][9][10][11][12], multi-phase coded signal (MPCS) modulation [13], and near-top-hat-shaped spectrum [14][15][16][17][18]. In recent years, great progress has been made in power scaling of PM fiber laser within 10 GHz linewidth [5][6][7][8][9][10][11][12][13][14][15][16][17][18][19], and the highest output power reaches 2.3 kW with 8.5 GHz linewidth using a neartop-hat-shaped spectrum seed laser in public reports [15].…”

Section: Introductionmentioning

confidence: 99%

Power scaling of high-power linearly polarized fiber lasers with <10 GHz linewidth

Chu

Shu

et al. 2023

Front. Phys.

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In this work, an all-fiberized polarization-maintained (PM) fiber laser has been demonstrated with a near-top-hat-shaped spectrum. By optimizing the modulation signal to generate near-top-hat-shaped spectrums, a 3-kW PM fiber laser has been achieved at <10 GHz linewidth with the polarization extinction ratio of 96% and beam quality of 1.156, which is the highest output power ever reported with approximately 10 GHz linewidth, and further scaling of output power is limited by stimulated Brillouin scattering. By decomposing the mode content, the proportion of the fundamental mode in the output laser is above 97%. The stimulated Raman scattering suppression ratio reaches 62 dB at the maximal output power.

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Kilowatt-Level PM Amplifiers for Beam Combining

Cited by 8 publications

References 0 publications

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

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

3 kW polarization maintained fiber lasers with 10.6 GHz linewidth and near diffraction limited beam quality

Power scaling of high-power linearly polarized fiber lasers with <10 GHz linewidth

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