A new material for high-power laser fibers

Langner, Andreas; Schötz, Gerhard; Such, Mario; Kayser, Thomas; Reichel, V.; Grimm, Stephan; Kirchhof, J.; Krause, Volker; Rehmann, Georg

doi:10.1117/12.761671

Cited by 51 publications

(25 citation statements)

References 9 publications

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“…We have briefly reviewed the production steps of Yb-doped fused bulk silica which we introduced at the Photonics West in 2008 [3]. With this technique we are able to produce a rare earth doped bulk silica with a number of unique advantages such as excellent axial and radial dopant and refractive index homogeneity, excellent batch to batch reproducibility of the doping levels, large rod and batch sizes and good processability into rods, tubes, capillaries, etc.…”

Section: Discussionmentioning

confidence: 99%

“…IPHT und Heraeus Quarzglas developed the process to sinter Yb-doped fused silica granulates and produced very homogeneous rare earth doped bulk silica core rods. This technique was first reported at the Photonics West 2008 [3] and the progress with this material has been regularly presented (at the Photonics West 2009 [4] and 2010 [5]). At present highly homogeneous rare earth doped fused bulk silica rods with a weight of up to about 80 g can be produced.…”

Section: Introductionmentioning

confidence: 95%

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New developments in high power fiber lasers based on alternative materials

et al. 2011

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Sintering of Yb-doped fused silica granulates is a well established technique developed by the IPHT and Heraeus Quarzglas and it produces very homogeneous rare earth doped bulk silica core rods for fiber laser applications. By using a newly developed laser induced deflection (LID) technique we are able to pre-characterize directly the material absorption properties of the bulk material prior to the laser fiber production. The bulk absorption results measured by LID are without scattering effects and they are typically in good agreement with the total attenuation measured in the fibers. We achieved a fiber background loss of 20 dB/km. Furthermore, we present detailed studies of the refractive index homogeneity of the Yb-doped bulk materials and laser fibers to show the unique features of the Yb-doped bulk silica. Multimode double cladding laser fibers with an extra large mode area XLMA fiber design (core diameter up to 100 µm) have been produced from the Yb-doped bulk silica rods by two different techniques. One is a classical jacketing method; the other employs the stacking of un-doped, Yb-and F-doped rods and F-doped tubes. Different fiber types have been tested in different fiber laser setups. The influence of the fiber end cap properties on the fiber laser focus shift is discussed in detail. We have achieved fiber laser output powers up to 1.925 kW, limited only by the pump power. We also investigated the long term laser stability at different power levels.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 95%

New developments in high power fiber lasers based on alternative materials

et al. 2011

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“…This one, titled Repusil, 13 is based on the sintering and vitrication of doped powders. The prominent qualities of this technique for the fabrication of large volume of highly homogeneous material, whose the refractive index can be nely tune (about 2.10 −4 ), make it relevant for the realisation of VLMA leaky bers.…”

Section: Opto-geometrical Considerationsmentioning

confidence: 99%

Striving towards a periodicity breaking of the photonic crystal fibers microstructuration for an unprecedented singlemode robustness

et al. 2014

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International audienceWe report in this communication on the investigation of novel triple-clad Very-Large-Mode-Area (VLMA) largepitch- fibers demonstrating numerically a strengthening of the fiber singlemodeness. The practical feasibility of the proposed fiber designs is ensured by taking into account the specifications of the resorted manufacturing technique. After a brief discussion about the mechanism of modal filtering into state-of-the-art air-silica leaky structures, we will present a novel kind of VLMA fibers. Here, the standard 6-fold symmetry as well as the periodic photonic crystal cladding are removed in profit to a totally aperiodic inner cladding microstructuration. This aperiodicity enables to exacerbate the singlemode robustness by maximizing the high-order-modes (HOMs) leakage out of the gain region in favour of the Gaussian fundamental mode. The behaviour of two different aperiodic LPFs is reported in regard to the refractive index of the inclusions, the doped core diameter and the operating wavelength. Thus, the scalability of these novel structures is evidenced. Finally, the manufacturability challenge is estimated by taking into account small index-mismatch between the active core and the background material

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“…42. The peaks corresponding to 915 and 975 nm are characteristics absorption peaks of Yb 3+ ions (Langnera et al, 2008).The normal fiber NYb-3 and nano-particles fiber NYb-9 shows the minimum absorption loss compared to the fibers NYb-5, NYb-6 and NYb-7 containing larger sized particles. The nano-particle fiber NYb-9 is found to be the best from view point of the formation of very small sized nano-particles within 5-8 nm showing low background loss of 40-50 dB/Km at 1285 nm wavelength.…”

Section: Spectroscopic Properties Of Yb 2 O 3 Doped Nano-engineering mentioning

confidence: 99%