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

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

doi:10.1109/jphot.2021.3130236

Cited by 10 publications

(3 citation statements)

References 33 publications

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“…According to Ref. [ 55 ], a non-wavelength stabilized 976 nm LDs had a higher TMI threshold than a wavelength stabilized 976 nm LDs, so in order to avoid the decrease in the TMI threshold caused by the increase of fiber core, we used a non-wavelength stabilized 976 nm LDs as the pump source of the laser and replaced the combiner with two (18 + 1) × 1 pumps and a signal combiner. Finally, we achieved a 2 × 3 kW laser output, with no SRS observed in the output spectra at both ends.…”

Section: Experimental Study On Continuous Wave High Average Power Boflmentioning

confidence: 99%

Novel Bidirectional Output Ytterbium-Doped High Power Fiber Lasers: From Continuous to Quasi-Continuous

Zeng,

Ding,

Liu

et al. 2024

Micromachines

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Traditional ytterbium-doped high-power fiber lasers generally use a unidirectional output structure. To reduce the cost and improve the efficiency of the fiber laser, we propose a bidirectional output fiber laser (BOFL). The BOFL has many advantages over that of the traditional unidirectional output fiber laser (UOFL) and has a wide application in the industrial field. In theory, the model of the BOFL is established, and a comparison of the nonlinear effect in the traditional UOFL and the BOFL is studied. Experimentally, high-power continuous wave (CW) and quasi-continuous wave (QCW) BOFLs are demonstrated. In the continuous laser, we first combine the BOFL with the oscillating amplifying integrated structure, and a near-single-mode bidirectional 2 × 4 kW output with a total power of above 8 kW is demonstrated. Then, with the simple BOFL, a CW bidirectional 2 × 5 kW output with a total power of above 10 kW is demonstrated. By means of pump source modulation, a QCW BOFL is developed, and the output of a near-single mode QCW laser with a peak output of 2 × 4.5 kW with a total peak power of more than 9 kW is realized. Both CW and QCW output BOFL are the highest powers reported at present.

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Section: Experimental Study On Continuous Wave High Average Power Boflmentioning

confidence: 99%

Novel Bidirectional Output Ytterbium-Doped High Power Fiber Lasers: From Continuous to Quasi-Continuous

Zeng,

Ding,

Liu

et al. 2024

Micromachines

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“…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%

“…For these measures, there is still much work to be done before they are put into practical application. We can also optimize the signal and pump wavelengths to alleviate the quantum defect [53][54][55][56][57][58][59][60][61][62][63][64]. In addition, the pump absorption of the fiber can be optimized to reduce the temperature gradient in the fiber, inhibit the formation of long-period refractive index gratings, and suppress TMI.…”

Section: Introductionmentioning

confidence: 99%

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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Optimization and demonstration of 6 kW oscillating-amplifying integrated fiber laser employing spindle-shaped fiber to suppress SRS and TMI

Zeng

Yang

et al. 2023

Optics & Laser Technology

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

Cited by 10 publications

References 33 publications

Novel Bidirectional Output Ytterbium-Doped High Power Fiber Lasers: From Continuous to Quasi-Continuous

Novel Bidirectional Output Ytterbium-Doped High Power Fiber Lasers: From Continuous to Quasi-Continuous

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

Optimization and demonstration of 6 kW oscillating-amplifying integrated fiber laser employing spindle-shaped fiber to suppress SRS and TMI

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