Ring-up-doped fiber for the generation of more than 600  W single-mode narrow-band output at 1018  nm

Palma-Vega, Gonzalo; Walbaum, Till; Heinzig, Matthias; Kühn, Stefan; Hupel, Christian; Hein, Sigrun; Feldkamp, G.; Sattler, Bettina; Nold, Johannes; Haarlammert, Nicoletta; Thomas, Sabu; Eberhardt, Ramona; Tünnermann, Andreas

doi:10.1364/ol.44.002502

Cited by 15 publications

(7 citation statements)

References 10 publications

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“…To achieve a high-power single-mode operation at 1018 nm with strong ASE suppression, a ring-doped Ybdoped fiber with a geometry of 32/260 μm was designed [317]. The core was fully doped with Yb 3+ ions; however, the concentration was higher at the outer ring, producing an average NA of ~ 0.041.…”

Section: Doping Components Engineeringmentioning

confidence: 99%

Functional Fibers and Functional Fiber-Based Components for High-Power Lasers

et al. 2022

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The success of high-power fiber lasers is fueled by maturation of active and passive fibers, combined with the availability of high-power fiber-based components. In this contribution, we first overview the enormous potential of rare-earth doped fibers in spectral coverage and recent developments of key fiber-based components employed in high-power laser systems. Subsequently, the emerging functional active and passive fibers in recent years, which exhibit tremendous advantages in balancing or mitigating parasitic nonlinearities hindering high-power transmission, are outlined from the perspectives of geometric and material engineering. Finally, novel functional applications of conventional fiber-based components for nonlinear suppression or spatial mode selection, and correspondingly, the high-power progress of function fiber-based components in power handling are introduced, which suggest more flexible controllability on high-power laser operations. Graphical abstract

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Section: Doping Components Engineeringmentioning

confidence: 99%

Functional Fibers and Functional Fiber-Based Components for High-Power Lasers

et al. 2022

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“…1018 nm is a commonly utilized special wavelength in YDFL, which is located near the 1µm band. Notably, this wavelength holds importance for tandem pumping of YDFL, as discussed in references [15][16][17]20]. Study in this wavelength range can establish a robust experimental foundation for achieving higher power outputs in even shorter wavelength bands.…”

Section: Introductionmentioning

confidence: 98%

Brightness enhancement on random-distributed-feedback Raman fiber lasers pumped by multimode diodes

Hao,

Fan,

et al. 2024

High Pow Laser Sci Eng

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The power scaling on short wavelengths (SWs) fiber lasers operating around 1 µm are in significant demand for applications in energy, environment, and industry. The challenge for performance scalability of high-power SW lasers based on rare-earth (RE) doped fiber primarily lies on the physical limitations, including reabsorption, amplified spontaneous emission (ASE), and parasitic laser oscillation. Here, we demonstrate an all-fiberized, purely passive SW (1018nm) random-distributed-feedback Raman fiber laser (RRFLs) to validate the capability of achieving high-power output at SWs based on direct pumping by multimode LDs. Directly pumped by multimode LDs, the high-brightness RRFLs delivered over 656 W, with an electro-optical efficiency of 20% relative to the power. The slope efficiency is 94%. The beam quality M 2 factor is 2.9 (which is ~20 of pump) at the maximum output signal power, achieving the highest brightness enhancement (BE) of 14.9 in RRFLs. To the best of our knowledge, this achievement also represents the highest power record of RRFLs utilizing multimode diodes for directly pumping. This work may not only provide a new insight into the realization of high-power, highbrightness RRFLs but also is a promising contender in the power scaling on SWs below 1 µm.

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“…Thus, there are only a few reports in the Yb fibre MOPA at 1018 nm, where the highest output power was around 100 W [31,32] using a typical Yb-doped double-cladding fibre with the step-index refractive profile. Alternatively, the fibre amplifier employing specially fabricated fibre with ring-up Yb doping concentration successfully demonstrated to produce >600 W of output at 1018 nm due to the relatively high propagation loss of the ASE signal at wavelengths over 1030 nm, but it is not commercially available [33]. Therefore, there is no doubt that it will be very helpful if we can achieve a high output power over a few kilowatts at 1018 nm in an MOPA configuration employing commercial active fibres by suppressing the ASE, which the oscillator configuration cannot reach.…”

Section: Introductionmentioning

confidence: 99%

High-power ytterbium-doped fibre master-oscillator power-amplifier at 1018 nm

Park¹,

Oh²,

Park³

et al. 2022

Laser Phys.

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A high-power master-oscillator power-amplifier (MOPA) at 1018 nm employing ytterbium (Yb)-doped fibres as a gain medium is reported. Utilizing a diffraction grating as a reflector, we could successfully suppress the influence of the broadband amplified spontaneous emission on the master-oscillator or the power-amplifier, resulting in stable amplification of the laser signal at 1018 nm. Based on a simple theoretical simulation on gain spectra and experimental investigation on parasitic lasing thresholds, the Yb fibre MOPA constructed in-house yielded 220 W of output at 1018 nm with a beam propagation factor (M2) of 1.1. The prospects for further power scaling are considered.

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Ring-up-doped fiber for the generation of more than 600 W single-mode narrow-band output at 1018 nm

Cited by 15 publications

References 10 publications

Functional Fibers and Functional Fiber-Based Components for High-Power Lasers

Functional Fibers and Functional Fiber-Based Components for High-Power Lasers

Brightness enhancement on random-distributed-feedback Raman fiber lasers pumped by multimode diodes

High-power ytterbium-doped fibre master-oscillator power-amplifier at 1018 nm

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