Extruded tellurite glass optical fiber preforms

Belwalkar, Amit; Xiao, Hongsheng; Misiołek, Wojciech Z.; Toulouse, J.

doi:10.1016/j.jmatprotec.2010.07.018

Cited by 20 publications

(10 citation statements)

References 12 publications

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“…The die design is comprised of a pin suspended in a channel by four struts. This design has been described previously by Belwalker et al Extrusion dies were fabricated from stainless steel, which has been proven to be a suitable die material for oxide glasses including F2 due to its high mechanical stability . In addition, and in contrast to other potential die materials such as graphite, stainless steel dies have not shown the propensity for particles transferring from the die material to the extruded glass .…”

Section: Methodsmentioning

confidence: 99%

“…Also, glass billet extrusion provides a single‐step process from glass billet to the desired glass tube where cumbersome post‐processing is not required. Several groups have previously demonstrated the capability of the extrusion process to form complex structures in various glasses; the flow behavior of glasses during extrusion has also been investigated . The previously reported extruded glass elements with various geometries are typically processed further into optical fibres, where modifying the fibre drawing conditions provides additional dimensional control.…”

Section: Introductionmentioning

confidence: 99%

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High precision extrusion of glass tubes

Kalnins

Bachus

Gooley³

et al. 2018

Int J of Appl Glass Sci

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Precision glass tubes for analytical instrumentation often require tight tolerances in their inner and outer diameter, which makes them cumbersome to fabricate. The extrusion method is a potential method for the fabrication of precision glass tubes, however, the effects of die swell and taper which occur during the extrusion process can distort the final product. This work aims to determine the tolerances that can be achieved for glass tubes fabricated using the extrusion method by comparing the extent of the die swell and tapering on tubes extruded under a variety of extrusion parameters. Lead‐silicate glass tubes of 6.5 mm outer diameter and 0.50 mm inner diameter were fabricated with a taper of <1% for the outer diameter and <5% for the inner diameter over 200 mm lengths. This target geometry was achieved using a volume flow rate of 4.7 mm3/s, a glass viscosity of 107.2 Pa.s and a die geometry that accommodated a 8%‐10% offset due to die swell. This result indicates the extrusion method is a viable method for producing glass tubes with tight tolerances for applications in analytical instrumentation.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

High precision extrusion of glass tubes

Kalnins

Bachus

Gooley³

et al. 2018

Int J of Appl Glass Sci

View full text Add to dashboard Cite

show abstract

“…A wide range of glasses have been processed using this approach since the 1970s, including soda-lime silica, lead silicate, calcium aluminate and boric oxide glasses [21][22][23]. Extruding uni-material microstructure optical fiber preforms is now a standard approach, including the extrusion of preforms from soft oxide glass and polymer [24,25]. Considerably fewer reports have been published on the extrusion of ChGs [26][27][28].…”

Section: Introductionmentioning

confidence: 99%

Multimaterial disc-to-fiber approach to efficiently produce robust infrared fibers

Tao

Shabahang

Dai

et al. 2014

Opt. Mater. Express

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A critical challenge in the fabrication of chalcogenide-glass infrared optical fibers is the need for first producing large volumes of highpurity glass-a formidable task, particularly in the case of multicomponent glasses. We describe here a procedure based on multimaterial coextrusion of a hybrid glass-polymer preform from which extended lengths of robust infrared fibers are readily drawn. Only ~2 g of glass is required to produce 46 m of step-index fiber with core diameters in the range 10-18 μm. This process enables rapid prototyping of a variety of glasses for applications in the delivery of quantum cascade laser light, spectroscopy, sensing, and astronomy.

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“…While polymers are the material of choice for many other extrusion applications, for the case of optical fibers the use of specific glasses is often required to achieve targeted optical properties. Microstructured Optical Fibers (MOF), which have complex geometrical patterns of holes in the cross section, are an important example . To achieve the desired preform structure and excellent optical quality (to achieve ultimately low‐loss optical fibers), use of high viscosity combined with low speed is essential.…”

Section: Introductionmentioning

confidence: 99%

Computational Modeling of Die Swell of Extruded Glass Preforms at High Viscosity

et al. 2014

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Computational simulations of glass extrusion are performed to quantify the effects of material behavior and slip at the die/ glass interface on the die swell. Experimental data for three glass types are used to guide the computational study, which considers glass material to be viscous with and without shear thinning and viscoelastic using the Maxwell upper-convected model. The study starts with assuming no-slip at the glass/die interface to see if material behavior alone can explain the die swell results, and then considers slip using the Navier model where interface shear is directly proportional to the relative slip speed at the interface. Consistent with the possibility of slip and intended high viscosity applications, viscosity ranging from 10 7.4 -10 8.8 PaÁs was used. Based on optimization of the various input parameters required to achieve the measured die swell and ram force values, the study concludes that interface slip occurred as only extreme values of the shear thinning parameters provided an alternative.

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Extruded tellurite glass optical fiber preforms

Cited by 20 publications

References 12 publications

High precision extrusion of glass tubes

High precision extrusion of glass tubes

Multimaterial disc-to-fiber approach to efficiently produce robust infrared fibers

Computational Modeling of Die Swell of Extruded Glass Preforms at High Viscosity

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