Suppression of stimulated Raman scattering in a high-power fiber amplifier by inserting long transmission fibers in a seed laser

Li, Tenglong; Ke, Weiwei; Ma, Yanxing; Sun, Yunxu; Gao, Qingsong

doi:10.1364/josab.36.001457

Cited by 25 publications

(13 citation statements)

References 23 publications

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“…5. Firstly, we introduced a 115-m passive fiber which can suppress the seed power instability [16]. Then, a TFBG is also introduced to filter the Raman noisy, and its transmission and reflection spectra are shown in Fig.…”

Section: Experimental Setup and Resultsmentioning

confidence: 99%

“…With the development of pertinent studies, it was revealed that beside the Raman gain of Ybdoped fiber, the seed characteristics should also have non-negligible effects on the SRS in the highpower Yb-doped fiber amplifiers [12], [16], [25]. Some studies showed that the temporal instability of seed power can lower the SRS threshold of high-power fiber amplifiers [20].…”

Section: Introductionmentioning

confidence: 99%

“…Some studies showed that the temporal instability of seed power can lower the SRS threshold of high-power fiber amplifiers [20]. Some methods to suppress the negative effect of seed instability were also presented, e.g., introducing the long passive fiber in the seed source [16] or optimize the bandwidth of seed source [20]. Another seed characteristic is the Raman noisy in the seed light.…”

Section: Introductionmentioning

confidence: 99%

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Weak-Seed Induced Enhancement of Stimulated Raman Scattering in Distributed Side-Pumped Yb-Doped Fiber Amplifiers

et al. 2020

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The effect of tens-of-Watt seed light on the stimulated Raman scattering (SRS) in a distributed side-pumped Yb-doped fiber amplifier is studied. By using two sorts of seed sources with the power smaller than 70 W, it is observed in experiment that the SRS can be enhanced by lowering the seed power. To the best of our knowledge, this is the first observation of the weak-seed enhancement of SRS in the distributed side-pumped Ybdoped fiber amplifier. In order to reveal the physical mechanism of the phenomenon, the numerical study is carried out. It is found that the Yb-gain at Raman wavelength, although much smaller than that at signal wavelength (i.e., 1080 nm), plays an important role in the phenomenon. It is also revealed that the weak-seed enhancement of SRS can only be presented when the dopant concentration is large enough (e.g., larger than 3 × 10 25 in our numerical calculation). Besides, with more effective suppression of Raman seed, the weak-seed induced enhancement of SRS could be observed in a larger seed power range. The pertinent results and conclusion can provide significant guidance for designing high-power fiber lasers and amplifiers.

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Section: Experimental Setup and Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Weak-Seed Induced Enhancement of Stimulated Raman Scattering in Distributed Side-Pumped Yb-Doped Fiber Amplifiers

et al. 2020

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“…So it is difficult to balance TMI and SRS at the same time. In order to realize the simultaneous suppression of TMI and SRS, substantial research work has been carried out, including designing the new fiber structure [9][10][11][12][13][14], optimizing the laser system parameters and structure [15][16][17][18], and so on. From the perspective of laser structure, high-power fiber lasers are mainly divided into two types: the fiber amplifiers based on master oscillation power amplification (MOPA) structure and the fiber laser oscillators based on Fabry-Perot (FP) cavity structure.…”

Section: Introductionmentioning

confidence: 99%

A 3.5-kW near-single-mode oscillating–amplifying integrated fiber laser

Zeng

Wang

Yang

et al. 2021

High Pow Laser Sci Eng

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The fiber laser based on oscillating-amplifying integrated structure has the potential to take into account the advantages of fiber laser oscillator and amplifier with the characteristics of strong anti-back reflected light ability and high efficiency. Here, we achieved a 3.5 kW near single-mode (M 2~1 .24) oscillating-amplifying integrated fiber laser with an active fiber length of 8 m in the oscillating section and 17.6 m in the amplifying section. While operating at the maximum power, the optical-to-optical conversion efficiency is 87.0%, and the intensity of stimulated Raman scattering is about 23.61 dB lower than the signal light. As far as we know, this is the highest output power of the oscillating-amplifying integrated fiber laser, accompanied with the best beam quality and the highest efficiency.

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“…The critical parameters to evaluate the threshold output power of SRS are the effective length of the optical fiber and the effective area of the mode. Various techniques for suppressing SRS have been investigated, among which decreasing the fiber length and increasing the fiber core size are the main ones [26][27][28][29][30][31][32][33]. Raman gain coefficient in fibers is typically on the order of 10 -13 m/W, which is nearly three orders of magnitude smaller than the Brillouin gain coefficient discussed next.…”

mentioning

confidence: 99%

Towards Ultimate High-power Scaling: Coherent Beam Combing of Fiber Lasers

Fathi¹,

Närhi²,

Gumenyuk³

2021

Preprint

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Fiber laser technology has been demonstrated as a versatile and reliable approach for laser source manufacturing with a wide range of applicability in various fields ranging from science to industry. The power/energy scaling of single fiber laser systems has faced several fundamental limitations. To overcome them and to boost the power/energy level even further, combining the output powers of multiple lasers has become the primary approach. Among various combining techniques, the coherent beam combining of fiber amplification channels is the most promising approach, instrumenting ultra-high power/energy lasers with near-diffraction-limited beam quality. This paper provides a comprehensive review of the progress of coherent beam combining for both continuous-wave and ultrafast fiber lasers. The concept of coherent beam combining from basic notions to specific details of methods, requirements, and challenges are discussed, along with reporting some practical architectures for both continuous and ultrafast fiber lasers.

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Suppression of stimulated Raman scattering in a high-power fiber amplifier by inserting long transmission fibers in a seed laser

Cited by 25 publications

References 23 publications

Weak-Seed Induced Enhancement of Stimulated Raman Scattering in Distributed Side-Pumped Yb-Doped Fiber Amplifiers

Weak-Seed Induced Enhancement of Stimulated Raman Scattering in Distributed Side-Pumped Yb-Doped Fiber Amplifiers

A 3.5-kW near-single-mode oscillating–amplifying integrated fiber laser

Towards Ultimate High-power Scaling: Coherent Beam Combing of Fiber Lasers

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