110 W fiber laser

Dominic, Vince; MacCormack, Stuart; Waarts, R.; Sanders, Steve; Bicknese, S.; Dohle, Rainer; Wolak, E.; Yeh, Ping-Cheng; Zucker, Erik

doi:10.1109/cleo.1999.834612

Cited by 31 publications

(22 citation statements)

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“…Energy can only be extracted if there is a net gain in the fiber, i.e., as long as the stored energy exceeds a bleaching level for which dB. Thus, the extractable energy is given by (4) From (2). and (3), it follows that (5) (6) As a rule of thumb, the extractable energy stored in a fiber (i.e., energy above the bleaching level of the fiber) is limited to around ten times the saturation energy.…”

Section: Theorymentioning

confidence: 99%

Characteristics of Q-switched cladding-pumped ytterbium-doped fiber lasers with different high-energy fiber designs

Ranaud

Offerhaus

Álvarez-Chávez

et al. 2001

IEEE J. Quantum Electron.

132

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Abstract-We theoretically and experimentally analyze Q-switched cladding pumped ytterbium-doped fiber lasers designed for high pulse energies. We compare the extractable energy from two high-energy fiber designs: 1) single-or few-moded low-NA large mode area (LMA) fibers and 2) large-core multimode fibers, which may incorporate a fiber taper for brightness enhancement. Our results show that the pulse energy is proportional to the effective core area and, therefore, LMA fibers and multimode fibers of comparable core size give comparable results. However, the energy storage in multimode fibers is mostly limited by strong losses due to amplified spontaneous emission (ASE) or even spurious lasing between pulses. The ASE power increases with the number of modes in a fiber. Furthermore, spurious feedback is more difficult to suppress with a higher NA, and Rayleigh back-scattering increases with higher NA, too. These effects are smaller in low-NA LMA fibers, allowing for somewhat higher energy storage. For the LMA fibers, we found that facet damage was a more severe restriction than ASE losses or spurious lasing. With a modified laser cavity, we could avoid facet damage in the LMA fiber, and reached output pulse energies as high as 2.3 mJ, limited by ASE. Theoretical estimates suggest that output pulse energies around 10 mJ are feasible with a larger core fiber, while maintaining a good beam quality.Index Terms-Double-cladding, fiber laser, large core fiber, Q-switched laser, Ytterbium.

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Section: Theorymentioning

confidence: 99%

Characteristics of Q-switched cladding-pumped ytterbium-doped fiber lasers with different high-energy fiber designs

Ranaud

Offerhaus

Álvarez-Chávez

et al. 2001

IEEE J. Quantum Electron.

132

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“…For these reasons, fiber lasers can be power-scaled without the reduction of efficiency and brightness that are common problems for conventional "bulk" lasers. To date, output powers of well over 100 W in nearly diffraction-limited beams and 1 kW in multimode beams have been reported from ytterbiumand neodymium-doped fiber lasers at wavelengths of around 1.1 m [1]- [4]. While ytterbium-and neodymium-doped fiber lasers are attractive because of their efficiency, emission in other wavelength regions requires other dopants.…”

Section: Introductionmentioning

confidence: 99%

High-power and tunable operation of erbium-ytterbium co-doped cladding-pumped fiber lasers

Nilsson

Alam

Álvarez-Chávez³

et al. 2003

IEEE J. Quantum Electron.

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Abstract-We describe erbium-ytterbium co-doped fiber lasers in different free-running and tunable configurations. The lasers were cladding-pumped by high-power multimode diode sources. We compare pumping at 915 and 980 nm. With a free-running laser, we obtained slope efficiencies of up to 50% with 915-nm pumping and 38% with 980-nm pumping, with respect to absorbed pump power. We reached a double-ended output power of 16.8 W from the free-running laser. Thanks to a high rare-earth concentration and a small inner cladding area (possible with the high-brightness pump sources we used), the operating pump absorption of the fiber reached 8 dB/m. With such high absorption, short fibers with high nonlinear thresholds are possible even with cladding pumping. The tunable fiber laser had a tuning range from 1533 to 1600 nm and emitted 6.7 W of output power at 1550 nm in a high-brightness, single-polarization, narrow linewidth beam.

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“…It is not out of the significance that there is also a possibility of developing a generation of high power/energy radiation in the spectrum range between 1400 and 2200 nm. this combination allowed for reaching a record -150 Wvalue of generating power in the laser set-up pumped from the forehead [26]. The pair of ions Yb 3+ /Er 3+ , used in setups generating in the band of 1500 nm, allows for increasing the pumping efficiency of an active fibre.…”

Section: Re Ions Doped In the Active Fibersmentioning

confidence: 99%