3.1 kW monolithic MOPA configuration fibre laser bidirectionally pumped by non-wavelength-stabilized laser diodes

Yan, Ping; Huang, Yusheng; Sun, Junyi; Li, Dan; Wang, Xuejiao; Gong, Mali; Xiao, Qirong

doi:10.1088/1612-202x/aa7c92

Cited by 20 publications

(15 citation statements)

References 17 publications

(18 reference statements)

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“…The bidirectional-pump configuration also distributes the heat load more evenly than the single-end-pump configurations, and thus further enhances the TMI threshold [15,24] . Besides, according to previous studies [25] , the bidirectional-pump configuration enjoys the advantage of suppressing the SRS. Both of the TFB combiners couple the pump light into the inner cladding of the double cladding output fiber with a diameter of 400 μm and an NA of 0.46.…”

mentioning

confidence: 81%

4.05 kW monolithic fiber laser oscillator based on home-made large mode area fiber Bragg gratings

Yang

Zhang

et al. 2018

Chin. Opt. Lett.

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With the increasing output power of the monolithic fiber laser oscillators, the stimulated Raman scattering (SRS) effect becomes one of the main limitations of power scaling. Employing fiber with a larger mode area is an effective technique to mitigate the SRS, but, for the monolithic fiber laser oscillators, the difficulty of the inscription of the high-reflection fiber Bragg gratings (FBGs) increases with the fiber mode area. In this work, we demonstrated a high-power monolithic fiber laser oscillator based on the home-made large mode area FBGs and ytterbium-doped fiber (YDF) with 25 μm core diameters. A maximum output power of 4.05 kW is achieved at the central wavelength of ∼1080 nm with a total 915 nm pump power of ∼6.7 kW. At the operation of 4.05 kW, the intensity of the Raman Stokes light is ∼25 dB below the signal laser, and the beam quality (M 2-factor) is ∼2.2. To the best of our knowledge, this is the first detailed report of the monolithic fiber laser oscillator with an output power beyond 4 kW.

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mentioning

confidence: 81%

4.05 kW monolithic fiber laser oscillator based on home-made large mode area fiber Bragg gratings

Yang

Zhang

et al. 2018

Chin. Opt. Lett.

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“…High-power narrow-linewidth fiber lasers (NLFLs) have wide applications in beam combination, lidar, nonlinear frequency conversion and gravitational wave detection, which have attracted great attentions in the past years [1]. Onestage master oscillator power amplifier (MOPA) with a narrow-linewidth seed has been proved to be an efficient way to acquire high-power narrow-linewidth lasers for high brightness spectrum combination [2][3][4]. This kind of structure is very simple and low cost comparing with the most used scheme of power-amplified phase-modulated single frequency seed [5].…”

Section: Introductionmentioning

confidence: 99%

3.5 kW narrow-linewidth FBG-based MOPA fiber lasers with high signal to noise ratio

Tian

Rao²,

Wang³

et al. 2022

Thirteenth International Conference on Information Optics and Photonics (CIOP 2022)

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One-stage master oscillator power amplifier (MOPA) is an efficient way to acquire high-power narrow-linewidth fiber lasers (NLFLs), which have wide usage in beam combination and detection. In this paper, we set up a narrow-linewidth one-stage MOPA fiber laser system which utilize a compact fiber oscillator as the seed laser. By optimizing the temporal characteristics of seed laser with a backward pumping structure of amplification stage, we finally acquire a 3.5 kW near single mode laser output with 3 dB and 20 dB linewidth of 0.26 nm and 1.1 nm, respectively. The slope efficiency reaches to 83.4%. At the maximum power, the signal to noise ratio ratio is ~60 dB on the spectrum and the M2 factor is measured about 1.3.

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“…It should be noted that the mentioned achievements are realized in oscillator configuration, which indicates that the handling and endurance ability of FBGs may be one of the restrictions for power scaling. Apart from this, master oscillator power amplification (MOPA) configuration is another alternative for HPFLs that can acquire high laser power, and as a matter of fact most several-kilowatt HPFLs utilize this configuration at present time [22][23][24][25][26][27]. This architecture avoids the stability problems of high power oscillators, meanwhile the power scaling will benefit from the higher coupled pump power.…”

Section: Introductionmentioning

confidence: 99%

Pure Passive Fiber Enabled Highly Efficient Raman Fiber Amplifier With Record Kilowatt Power

Chen

Leng

et al. 2019

IEEE Access

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Kilowatt-level high efficiency all-fiberized Raman fiber amplifier based on pure passive fiber is proposed for the first time in this paper. The laser system is established on master oscillator power amplification configuration while a piece of graded-index passive fiber is utilized as stokes shifting as well as gain medium, which is entirely irrelevant to rare-earth-doped gain mechanism. When the pump power is 1368.8 W, we obtained 1002.3 W continuous-wave laser power at 1060 nm with the corresponding opticalto-optical efficiency of 84%. The beam parameter M 2 improves from 9.17 of the pump laser to 5.11 of the signal laser through the amplification process, and the brightness enhancement is about 2.57 at maximum output power as a consequence of the beam clean-up process in the graded-index fiber. To the best of our knowledge, we have demonstrated the first kilowatt-level high efficiency Raman fiber amplifier based on pure passive fiber with brightness enhancement.INDEX TERMS Fiber lasers, fiber nonlinear optics, high power amplifiers, Raman scattering.

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3.1 kW monolithic MOPA configuration fibre laser bidirectionally pumped by non-wavelength-stabilized laser diodes

Cited by 20 publications

References 17 publications

4.05 kW monolithic fiber laser oscillator based on home-made large mode area fiber Bragg gratings

4.05 kW monolithic fiber laser oscillator based on home-made large mode area fiber Bragg gratings

3.5 kW narrow-linewidth FBG-based MOPA fiber lasers with high signal to noise ratio

Pure Passive Fiber Enabled Highly Efficient Raman Fiber Amplifier With Record Kilowatt Power

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