Optimizing the pump wavelength to improve the transverse mode instability threshold of fiber laser by 3.45 times

Wan, Yingchao; Yang, Baolai; Wang, Peng; Xi, Xiaoming; Zhang, Hanwei; Wang, Xiaolin

doi:10.1080/09500340.2021.1967492

Cited by 8 publications

(6 citation statements)

References 21 publications

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“…Specifically, the counter-pump configuration can weaken the nonlinear effect and suppress TMI. The optimization of the pump wavelength can make the heat distribution in the laser more uniform which means a higher TMI threshold [29,61,85,88]. For fiber coiling, on the one hand, it will increase the loss of HOMs; on the other hand, it will also lead to the coupling between modes, so its effect on TMI needs to be discussed separately.…”

Section: Discussionmentioning

confidence: 99%

“…In order to ensure sufficient pump absorption when the pump wavelength is changed, the fiber length is selected as 20 m. Considering the absorption cross-sections and quantum defects of ytterbium-doped fibers at various wavelengths, we chose to calculate wavelengths of 915 nm, 969 nm, 976 nm, 981 nm, and 982 nm, respectively. The simulation results can also be compared with our previous experiments [61,85]. The simulation results are shown in Figure 3b and Table 3.…”

Section: Tmi Suppression Based On Pump Wavelength Optimizationmentioning

confidence: 91%

“…It is applied to the high-power fiber laser, and the TMI threshold of the laser is compared with that of the lasers pumped by common LDs, including wavelength stabilized LDs with a central wavelength of 976 nm (WS-976), LDs with central wavelengths of 915 nm (915). In the past few years, we have designed an experimental platform with a low TMI threshold to verify the suppression ability of pump wavelength optimization to the TMI [61,62,85,88]. The TMI threshold of the laser pumped by WS-981 and WS-969 is 2.2 times and 3.45 times that of the laser pumped by WS-976 under the same conditions [61,85].…”

Section: Tmi Suppression By Optimizing Pump Wavelengthmentioning

confidence: 99%

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Optimization and Demonstration of Direct LD Pumped High-Power Fiber Lasers to Balance SRS and TMI Effects

Zeng

Wang

et al. 2023

Photonics

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Up to now, transverse mode instability (TMI) and stimulated Raman scattering (SRS) have become the main factors limiting the power scaling of conventional ytterbium-doped fiber laser. Many technologies are proposed to suppress the SRS or TMI individually, but most of them are contradictions in practical application. In this article, we focus on the technologies that can balance the suppression of both SRS and TMI, including fiber coiling optimization, pump wavelength optimization, pump configuration optimization, and novel vary core diameter active fiber. Firstly, we validate the effectiveness of these technologies in both theoretical and relatively low-power experiments, and introduce the abnormal TMI threshold increasing in a few-mode fiber amplifier with fiber coiling. Then, we scale up the power through various types of fiber lasers, including wide linewidth and narrow linewidth fiber lasers, as well as quasi-continuous wave (QCW) fiber lasers. As a result, we achieve 5~8 kW fiber laser oscillators, 10~20 kW wide linewidth fiber laser amplifiers, 4 kW narrow linewidth fiber amplifiers, and 10 kW peak power QCW fiber oscillators. The demonstration of these new technical schemes is of great significance for the development of high-power fiber lasers.

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Section: Discussionmentioning

confidence: 99%

Section: Tmi Suppression Based On Pump Wavelength Optimizationmentioning

confidence: 91%

Section: Tmi Suppression By Optimizing Pump Wavelengthmentioning

confidence: 99%

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Optimization and Demonstration of Direct LD Pumped High-Power Fiber Lasers to Balance SRS and TMI Effects

Zeng

Wang

et al. 2023

Photonics

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“…Numerous theoretical and experimental studies have been carried out by researchers [15][16][17][18][19][20][21][22][23][24]. As a result, a lot of methods have been studied for suppressing TMI [25,26] can be suppressed by change pump wavelength [27][28][29], fiber parameters [19] (such as core diameter and numerical aperture), curvature radius [30,31] pump schemes, etc.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on Transverse Mode Instability Characteristics of Few-Mode Fiber Laser Amplifier Under Different Bending Conditions

et al. 2022

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We studied the transverse mode instability (TMI) characteristics of few-mode fiber laser amplifier employing ytterbium-doped fiber (YDF) with core/cladding diameter of 30/400μm under different bending diameters. The gain fiber is coiled in ellipse shape with minimum bending diameter changed from 9cm, 10cm, 11cm to 12cm in the bending part, and the experimental results show an anomaly characteristic of TMI. The TMI threshold improved from 772W, 1149W and 1458W to 1641W when the bending diameter of YDF increase from 9cm, 10cm, 11cm to 12cm, accompanied by the deterioration of beam quality from 1.60, 1.67, 1.87 to 1.95. This is mainly because tightly bending in few-mode fiber will promote the overlap between modes and lead to mode coupling, which may trigger TMI. Besides, the bending losses of HOMs decrease while bending diameter increasing, so that there is higher output efficiency and deteriorated beam quality when bending diameter increase. Although the phenomenon is not agreed with common TMI with near single-mode fiber laser, the result will be helpful for the design and power scaling of few-mode fiber lasers.

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“…In 2016, Yang et al employed the 915nm pump instead of the 976 nm pump to mitigate the limitation of TMI and enable power scaling [26]. In this year, our group increased the TMI thresholds by a factor of 2.2 and 3.45, respectively, by adjusting the central wavelength of the pump source under the same circumstances [27][28].…”

Section: Introductionmentioning

confidence: 99%

Comparison and Optimization on Transverse Mode Instability of Fiber Laser Amplifier Pumped by Wavelength-Stabilized and Non-Wavelength-Stabilized 976 nm Laser Diode

Wan

Yang

et al. 2022

IEEE Photonics J.

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Optimizing the pump wavelength to improve the transverse mode instability threshold of fiber laser by 3.45 times

Cited by 8 publications

References 21 publications

Optimization and Demonstration of Direct LD Pumped High-Power Fiber Lasers to Balance SRS and TMI Effects

Optimization and Demonstration of Direct LD Pumped High-Power Fiber Lasers to Balance SRS and TMI Effects

Experimental Study on Transverse Mode Instability Characteristics of Few-Mode Fiber Laser Amplifier Under Different Bending Conditions

Comparison and Optimization on Transverse Mode Instability of Fiber Laser Amplifier Pumped by Wavelength-Stabilized and Non-Wavelength-Stabilized 976 nm Laser Diode

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