2.1 kW single mode continuous wave monolithic fiber laser

Rosales-Garcia, Andrea; Tobioka, H.; Abedin, Kazi S.; Dong, Hao; Várallyay, Zoltán; Szabó, Áron; Taunay, T. F.; Sullivan, Sean P.; Headley, C.

doi:10.1117/12.2077619

Cited by 9 publications

(4 citation statements)

References 4 publications

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“…In conjunction with the proposed MI suppression methods, higher doped fiber can realize the suppression of MI and SBS and SRS simultaneously [47]. Take the cases in [48] for example, in which the power-scaling capacity of the amplifier was limited to 2.6 kW by SRS, such that the SRS threshold can be further increased by employing fiber with a higher doping concentration while maintaining the merit of having no MI. Furthermore, the computation resources can be saved by increasing the dopant concentration to shorten the length of the fiber in the calculation of the MI threshold, which is useful for some time-consuming numerical models [49,50].…”

Section: Experimental Study and Discussionmentioning

confidence: 99%

Study of dopant concentrations on thermally induced mode instability in high-power fiber amplifiers

Tao

Wang

et al. 2016

Laser Phys.

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The dependence of mode instabilities (MIs) on ytterbium dopant concentrations in highpower fiber amplifiers has been investigated. It is theoretically shown that, by only varying the fiber length to maintain the same total small-signal pump absorption, the MI threshold is independent of dopant concentration. MI thresholds of gain fibers with ytterbium dopant concentrations of 5.93 × 10 25 m −3 and 1.02 × 10 26 m −3 have been measured which exhibit similar MI thresholds and agree with the theoretical results. The result indicates that heavy doping of active fiber can be adopted to suppress nonlinear effects without decreasing the MI threshold. This provides a method of maximizing the power output of fiber laser, taking into account the stimulated Brillouin scattering, stimulated Raman Scattering, and MI thresholds simultaneously.

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Section: Experimental Study and Discussionmentioning

confidence: 99%

Study of dopant concentrations on thermally induced mode instability in high-power fiber amplifiers

Tao

Wang

et al. 2016

Laser Phys.

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“…Fiber lasers have been widely adopted as laser sources in many applications such as industrial manufacturing, com-municationsandmedical servicesfor the advantages of high conversion efficiency, good beam quality, compact structure and low maintenance operation. To satisfy the growing demand in the applications, the output powers of fiber lasers have increased remarkably in the last decade [1][2][3][4][5][6][7][8][9][10]. The output power of fiber lasers hasreached 100 kW [11]by combining tens of kW-levelsingle-mode lasers into a multimode output.…”

Section: Introductionmentioning

confidence: 99%

Mitigating transverse mode instability in a single-end pumped all-fiber laser oscillator with a scaling power of up to 2 kW

Yang

Zhang

Wang

et al. 2016

J. Opt.

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In the power scaling of monolithic fiber laser oscillators, thermally induced transverse mode instability (TMI) is one of the main limiting factors. The onset of TMI deteriorates the output laser beam quality and restricts the maximum achievable laser power. Most studies on TMI focus on fiber amplifiers, while reports on TMI in fiber laser oscillators are much fewer. Here, we report an experimental study on mitigating TMI by detuning the pumping wavelength in a single-end pumped monolithic fiber laser oscillator. The performance of the laser oscillator is investigated with individual 976 nm pumping, with individual 915 nm pumping, and with hybrid pumping. Experimental results show that TMI is mitigated by replacing 976 nm pumping with 915 nm pumping. In the hybrid pumping scheme, the influence of ratios of 976 nm pumping power to 915 nm pumping power on the TMI threshold is studied. Finally, by optimizing pumping power ratio, the output laser power of the monolithic fiber oscillator is enhanced to 2 kW. The M2 factor of the output laser is ∼1.6 and the Raman Stokes light occupies less than 1% of the total power.

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“…There has been a long time when stimulated Raman scattering (SRS) effect is considered to be one of the main obstacles for power scaling in general-type fiber lasers [1–3] . The generation of SRS in fiber laser system might cause serious effects due to the backscattered Stokes light [4] . Therefore, SRS in high-power fiber laser system has been under intensive investigation and lots of technical solutions to suppress SRS have been proposed and validated, such as employing large-mode-area fiber, and decreasing the length of active fiber by using highly doped fiber [4–10] .…”

Section: Introductionmentioning

confidence: 99%

“…The generation of SRS in fiber laser system might cause serious effects due to the backscattered Stokes light [4] . Therefore, SRS in high-power fiber laser system has been under intensive investigation and lots of technical solutions to suppress SRS have been proposed and validated, such as employing large-mode-area fiber, and decreasing the length of active fiber by using highly doped fiber [4–10] . Nevertheless, these are not intrinsic solutions and sometimes they would bring in side effects.…”

Section: Introductionmentioning

confidence: 99%

Toward high-power nonlinear fiber amplifier

Zhang

et al. 2018

High Pow Laser Sci Eng

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Stimulated Raman scattering (SRS) effect is considered to be one of the main obstacles for power scaling in general-type fiber lasers. Different from previous techniques that aim at suppressing SRS, nonlinear fiber amplifier (NFA), which manipulates and employs the SRS for power scaling in rare-earth-doped fiber, is under intensive research in recent years. In this paper, the authors will present an all-round study on this new kind of high-power fiber amplifier. A theoretical model is proposed based on the rate equation and amplified spontaneous emission (ASE), with random noise taken into account. By numerical solving of the theoretical model, the power scaling potential, heat analysis and advantages in suppressing the undesired backscattering light are quantificationally analyzed for the first time. Then two different types of high-power NFAs are demonstrated individually. Firstly, a laser diode pumped NFA has reached kilowatt output power, and the results agree well with theoretical predictions. Secondly, a tandem-pumped NFA is proposed for the first time and validated experimentally, in which 1.5 kW output power has been achieved. The authors also briefly discuss several new issues relating to the complex nonlinear dynamics that occur in high-power NFAs, which might be interesting topics for future endeavors.

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2.1 kW single mode continuous wave monolithic fiber laser

Cited by 9 publications

References 4 publications

Study of dopant concentrations on thermally induced mode instability in high-power fiber amplifiers

Study of dopant concentrations on thermally induced mode instability in high-power fiber amplifiers

Mitigating transverse mode instability in a single-end pumped all-fiber laser oscillator with a scaling power of up to 2 kW

Toward high-power nonlinear fiber amplifier

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