Development, manufacturing and lasing behavior of Yb-doped ultra large mode area fibers based on Yb-doped fused bulk silica

Langner, Andreas; Such, Mario; Schötz, Gerhard; Reichel, V.; Grimm, Stephan; Just, Florian; Leich, Martin; Kirchhof, J.; Wedel, Björn; Köhler, Gunnar; Strauch, Olaf; Mehl, Oliver; Krause, Volker; Rehmann, Georg

doi:10.1117/12.845761

Cited by 14 publications

(9 citation statements)

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“…This artifact is well known from the measurement of other fused silica samples. The real profile is flat without rounding and this has been proved by EPMA scans (electron probe micro analysis) that we presented and published at the Photonics West 2010 [5]. These scans showed profiles of homogeneous doping levels without radial gradients.…”

Section: Refractive Index Characterizationmentioning

confidence: 69%

“…These artifacts are again caused by the Abel transformation that is used to calculate the refractive index profile but this transformation is only valid for circular geometries. However, we are still able to estimate the heights of all refractive index steps even in this preform type with irregular profiles (for details see [5]). In addition, the refractive index profile of a 220 µm fiber, drawn from such a preform, was measured interferometrically at the company Interfiber Analysis by Fourier transform spectroscopy and interference microscopy (FTS-IM) [7].…”

Section: Refractive Index Characterizationmentioning

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: Refractive Index Characterizationmentioning

confidence: 69%

Section: Refractive Index Characterizationmentioning

confidence: 99%

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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“…In this technique, a tube containing silica is fused to create the core. The so-called REPUSIL (an acronym for "Reactive Powder Sintering of Silica") process, which was based on this powder sintering method, was developed by Heraeus Quartzglass and the Leibniz Institute of Photonics Technology (IPHT, Jena, Germany) [32]. This technique, the schematic of which can be found in [33], can be considered as a modification of the solution doping process.…”

Section: Silica-based Optical Fibersmentioning

confidence: 99%

Glass and Process Development for the Next Generation of Optical Fibers: A Review

Ballato

Ebendorff‐Heidepriem

Zhao

et al. 2017

Fibers

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Applications involving optical fibers have grown considerably in recent years with intense levels of research having been focused on the development of not only new generations of optical fiber materials and designs, but also on new processes for their preparation. In this paper, we review the latest developments in advanced materials for optical fibers ranging from silica, to semi-conductors, to particle-containing glasses, to chalcogenides and also in process-related innovations.

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“…The whole system will have a wall plug efficiency of at least 25%. XLMA fibers can be processed with the novel powder-sinter-route process (RePuSil) [2,3,4] which allows the production of large-sized, very homogeneously doped fiber preforms at low costs. Both active fibers and the fiber laser system as a whole have been researched and developed in the FaLaMat project funded by the German Federal Ministry of Education and Research (BMBF).…”

Section: Introductionmentioning

confidence: 99%

Fiber lasers based on beam quality converters for diode lasers

Bachert¹,

Rehmann²,

Luft³

et al. 2013

SPIE Proceedings

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Fiber laser based brightness converters enable diode laser beam sources to access a superior beam quality of better than 10 mm x mrad in combination with multi kW output power. A design of a fiber laser that is based on a single active optical converter fiber that is pumped by a direct diode is presented. Due to the high transfer efficiency of such brightness converters an electrical/optical efficiency > 25% can be achieved. The current status with an output power > 4 kW in combination with a beam quality of < 5 mm x mrad will be described. The principal design of such diode laser based fiber brightness converters will be presented and building blocks of such lasers will be outlined.As an application example laser welding will be presented of both the fiber converter laser and direct diode laser using optical light guides with identical core diameters on both lasers for comparison. Additionally, fibers with a core diameter of 200µm will be used on the fiber converter laser to perform remote welding. The weld results will be compared regarding welding depth and surface quality of the weld samples to determine the optimum power/brightness levels for different aluminum and steel materials.

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Development, manufacturing and lasing behavior of Yb-doped ultra large mode area fibers based on Yb-doped fused bulk silica

Cited by 14 publications

References 0 publications

New developments in high power fiber lasers based on alternative materials

New developments in high power fiber lasers based on alternative materials

Glass and Process Development for the Next Generation of Optical Fibers: A Review

Fiber lasers based on beam quality converters for diode lasers

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