1009  nm continuous-wave ytterbium-doped fiber amplifier emitting 146  W

Beier, Franz; Otto, Hans-Jürgen; Jáuregui, César; Vries, Oliver de; Thomas, Sabu; Limpert, Jens; Eberhardt, Ramona; Tünnermann, Andreas

doi:10.1364/ol.39.003725

Cited by 17 publications

(8 citation statements)

References 9 publications

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“…tandem pumping for Yb amplifiers have already motivated the development of high power shortwavelength pump fiber lasers which are needed to keep the length of the tandem amplifier short [38][39][40]. The sub-µs pulse pumping technique outlined here could further encourage experimental research in the field.…”

Section: Discussionmentioning

confidence: 99%

Sub-Microsecond Pulsed Pumping as a Means of Suppressing Amplified Spontaneous Emission in Tandem Pumped Fiber Amplifiers

Malinowski

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Zervas³

2015

IEEE J. Quantum Electron.

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Abstract-We propose a new tandem pumping scheme in threelevel rare-earth doped optical fibers where energy storage in a pump fiber laser enables much shorter (~500 ns) pump pulses than is possible with pulsed diode laser pumping. This has the effect of reducing the time during which the final amplifier has high inversion and hence reduces the ASE when compared to continuous wave (c.w.) tandem pumping. We simulate the gain and ASE dynamics in a pulse-pumped Yb-doped fiber amplifier and show that the ratio of amplified signal to ASE background can be improved by up to 2 orders of magnitude over a large range of pulse energies compared to c.w. tandem pumping. Sub-microsecond pulsed tandem pumping offers a relatively straightforward, as yet experimentally untried, way to substantially reduce undesirable ASE compared to the levels in diode-pumped fiber amplifiers.

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Section: Discussionmentioning

confidence: 99%

Sub-Microsecond Pulsed Pumping as a Means of Suppressing Amplified Spontaneous Emission in Tandem Pumped Fiber Amplifiers

Malinowski

Price

Zervas³

2015

IEEE J. Quantum Electron.

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“…The attractions of c.w. tandem pumping for Yb fiber amplifiers have led to high power short-wavelength pump fiber lasers being developed [29][30][31]. The additional benefits of sub-µs duration, overlapped pulse pumping as outlined here may well encourage further experimental research.…”

Section: Possible Pumping Schemesmentioning

confidence: 92%

Overlapped Pulsed Pumping of Tandem Pumped Fiber Amplifiers to Increase Achievable Pulse Energy

Malinowski

Price

Zervas

2017

IEEE J. Quantum Electron.

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Abstract-It has been reported previously that in the regime appropriate for amplifying femtosecond pulses using the chirped pulse amplification technique in Yb-fiber sources that sub-microsecond pulsed tandem pumping not only provides the thermal benefits of c.w. tandem pumping but also enables strong suppression of ASE. In that case, the pump pulse preceded the signal pulse train. Here we propose a tandem pumping scheme in rare-earth-doped fiber amplifiers, where a train of signal pulses is amplified by a pump pulse which is almost exactly temporally overlapped. Simulations demonstrate that this can be used to create uniform gain across the signal pulse train, even at very high total pulse energies where there would be significant gain shaping in the previous case. In addition the pump is absorbed in a much shorter length, which increases the threshold for nonlinear effects and gain of greater than 26 dB is shown to be readily achievable in an amplifier as short as 1.5 m. This results in increased extractable energy before reaching the threshold for limiting nonlinear effects such as stimulated Raman scattering. These attributes should be attractive for high energy, high average power, ultrashort pulse, coherently combined fiber laser systems.

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“…The special design of large core diameter (80 μm) and robust single mode operation allows for high energy extraction with diffraction-limited beam quality. It is noteworthy that the unique double cladding structure of rod-type LPF with the small clad-to-core area ratio is critical for achieving a relatively high slope efficiency to amplify wavelengths shorter than 1030 nm with negligible ASE [14,24].…”

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confidence: 99%

87-W 1018-nm Yb-fiber ultrafast seeding source for cryogenic Yb: yttrium lithium fluoride amplifier

et al. 2018

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1009 nm continuous-wave ytterbium-doped fiber amplifier emitting 146 W

Cited by 17 publications

References 9 publications

Sub-Microsecond Pulsed Pumping as a Means of Suppressing Amplified Spontaneous Emission in Tandem Pumped Fiber Amplifiers

Sub-Microsecond Pulsed Pumping as a Means of Suppressing Amplified Spontaneous Emission in Tandem Pumped Fiber Amplifiers

Overlapped Pulsed Pumping of Tandem Pumped Fiber Amplifiers to Increase Achievable Pulse Energy

87-W 1018-nm Yb-fiber ultrafast seeding source for cryogenic Yb: yttrium lithium fluoride amplifier

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