A Novel Bidirectional Output Oscillating-Amplifying Integrated Fiber Laser With 2 Ports × 2 kW Level Near-Single-Mode Output

Liu, Jiaqi; Zeng, Lingfa; Wang, Peng; Yang, Baolai; Xi, Xiaoming; Shi, Chen; Zhang, Hanwei; Wang, Xiaolin; Xi, Fengjie

doi:10.1109/jphot.2022.3230376

Cited by 6 publications

(7 citation statements)

References 13 publications

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“…In 2018, researchers from the Iranian National Center for Laser Science and Technology proposed a new type of oscillating–amplifying integrated fiber laser, which can balance the advantages of fiber laser oscillators and amplifiers, including anti-reflective reflection, high efficiency, and simple control logic [ 56 ]. In 2023, we first proposed a BOFL-OA and achieved 2 × 2 kW near single-mode laser output [ 57 ]. Figure 14 shows a schematic diagram of the structure of a 2 × 2 kW BOFL-OA.…”

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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“…Such SRS is generated by the temporal chaos within the resonator. Liu et al reported a phenomenon of multi-level SRS at a nonstabilized resonator state [20]. Thus, measures can be initiated from the perspective of temporal stability.…”

Section: Introductionmentioning

confidence: 99%

Demonstration of a bidirectional oscillating-amplifying integrated fiber laser with two ports times 2.5kW

Liu,

Zeng,

wang

et al. 2023

Eighteenth National Conference on Laser Technology and Optoelectronics

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Bidirectional Oscillating-Amplifying Integrated Fiber Lasers (B-OAIFL) combine the advantages of Oscillating-Amplifying Integrated Fiber Lasers (OAIFL) and bidirectional output fiber lasers, including high efficiency, simple control logic, good anti-back reflection, low cost, and small volume. In this work, we introduced the (2+1)×1 Side Pump Signal Combiner (SPSC) between the Output Coupler Fiber Bragg Grating (OC-FBG) and the amplifying sections to address the temporal instability of the laser at low power levels under the counter pumping. Two groups of wavelength-stabilized 976 nm Laser Diodes (LDs) were directly coupled into the oscillating section to increase the laser power within the cavity, and then, a 60 W-level time-stabilized threshold signed as photodetector-detected no-pulse characteristics was achieved. We compared the output characteristics with two different fiber-coiling structures in the oscillating section (STR1, STR2). STR1 was coiled in a single-track-shaped fiber groove with a diameter ranging from 8.0 cm to 10.7 cm, while the coiling diameters of the two output ports were different. For STR2, an '8'-shaped coiling was adopted with gradually varying diameters from 8.0 cm to 9.5 cm and the same coiling diameter of 8.0 cm at both ports. The Transverse Mode Instability (TMI) threshold under the unidirectional pumping at end A and end B were 2271 W and 2530 W, respectively, with Structure one. With Structure two, the thresholds at end A and end B were 2735 W and 2508 W, respectively. Based on STR2 under the bidirectional pumping with a total pump power of 6997 W, we finally achieved a laser output of 2655 W at the end A and 2491 W at the end B, with a total power of 5146 W and a good beam quality of M2 to approximately 1.32 at end A and M2 to approximately 1.45 at end B, respectively. The Stimulated Raman Scattering (SRS) suppression ratio exceeded 40 dB for both end A and end B.

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“…In 2023, Liu et al . proposed a novel bidirectional output oscillating-amplifying integrated fiber laser and achieved a CW output of 2 × 2 kW with beam qualities of about M 2 = 1.35 25 . In order to meet the demand of the application market at a low cost, we combine the bidirectional structure with QCW fiber laser to achieve higher power and efficiency.…”

Section: Introductionmentioning

confidence: 99%

“…Compared with the unidirectional output laser, the bidirectional output laser can effectively not only reduce the cost and volume size, but also offer a higher work efficiency. The bidirectional output structure is expected to achieve higher output power with a broader industrial application prospect [24][25][26] . There are relatively few reports about bidirectional output lasers.…”

mentioning

confidence: 99%

“…In 2022, Zhong et al achieved the 2 × 2 kW near-single-mode CW laser with bidirectional output monolithic fiber laser, and the beam quality at both ends was about M 2 = 1.5 24 . In 2023, Liu et al proposed a novel bidirectional output oscillating-amplifying integrated fiber laser and achieved a CW output of 2 × 2 kW with beam qualities of about M 2 = 1.35 25 . In order to meet the demand of the application market at a low cost, we combine the bidirectional structure with QCW fiber laser to achieve higher power and efficiency.…”

mentioning

confidence: 99%

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2 × 4.5 kW bidirectional output near-single-mode quasi-continuous wave monolithic fiber laser

Ding,

Zeng,

Wang

et al. 2023

Sci Rep

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Quasi-continuous wave (QCW) laser has a very broad application in the industrial field, especially in additive manufacturing, surface treatment, laser cutting, laser cleaning, and laser drilling. Compared with the unidirectional fiber laser, the bidirectional output can be achieved two ports high power output with only one resonator, which can greatly reduce the industrial cost. However, there are few researches on QCW fiber lasers with bidirectional output. Here, we optimized and demonstrated a bidirectional output QCW laser with output power of 2 × 4.5 kW based on a double-clad ytterbium-doped fiber with a core/cladding diameter of 25/400 μm. The peak power at both ends reached 4515 W and 4694 W, respectively. The Raman suppression ratio at both ends of A and B is about 12 dB, and the beam quality factor M2 is about 1.37 and 1.42, respectively. The corresponding optical-to-optical efficiency is 79%. To the best of our knowledge, this is the highest peak power of QCW laser with near-single-mode beam quality in a bidirectional structure laser.

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A Novel Bidirectional Output Oscillating-Amplifying Integrated Fiber Laser With 2 Ports × 2 kW Level Near-Single-Mode Output

Cited by 6 publications

References 13 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

Demonstration of a bidirectional oscillating-amplifying integrated fiber laser with two ports times 2.5kW

2 × 4.5 kW bidirectional output near-single-mode quasi-continuous wave monolithic fiber laser

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